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Letteratura scientifica selezionata sul tema "Stratigraphic Eocene"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 gennaio 2023

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Articoli di riviste sul tema "Stratigraphic Eocene"

Williamson, P. E., C. J. Pigram, J. B. Colwell, A. S. Scherl, K. L. Lockwood e J. C. Branson. "PRE-EOCENE STRATIGRAPHY, STRUCTURE, AND PETROLEUM POTENTIAL OF THE BASS BASIN". APPEA Journal 25, n. 1 (1985): 362. http://dx.doi.org/10.1071/aj84031.

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Exploration in the Bass Basin has mainly concentrated on the Eocene part of the Eastern View Coal Measures with the pre-Eocene stratigraphy hardly being tested. Structural mapping using a good quality Bureau of Mineral Resources regional seismic survey and infill industry seismic data, in conjunction with seismic stratigraphy and well data, has generated an understanding of the structure and stratigraphy of the pre- Eocene basin, which suggests that exploration potential exists in structural and stratigraphic leads of both Paleocene and Cretaceous age.The Paleocene structure is influenced by the reactivation of normal faults developed at the time of the mid Cretaceous rift unconformity and reflects drape over deeper features. Consequently fault dependent structural closures often persist from Paleocene to (?)Jurassic levels. Possible stratigraphic traps are also observed against horst blocks and around the basin margins. The longitudinal fault directions are northwest and west northwest with an oblique northerly direction and a prevailing north northeasterly transverse direction.The Paieocene and Upper Cretaceous part of the Eastern View Coal Measures consists of sands, shales and coals deposited in alluvial fans, on flood plains, and in lakes. These are underlain by Early Cretaceous Otway Groups, sands, shales and volcanics. Both intervals have potential reservoir and source rocks and often occur at mature depths. No pre-Otway Group sediments have been encountered in wells in the Bass Basin. However, the Permo- Carboniferous and possibly Triassic strata that occur in Northern Tasmania exhibit reservoir and source rock potential and may extend offshore beneath the Bass Basin.Pre-Eocene structural and stratigraphic studies of the Bass Basin thus point to reservoir and hydrocarbon source potential for possible multiple hydrocarbon exploration targets.

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Wade, Bridget S., Mohammed H. Aljahdali, Yahya A. Mufrreh, Abdullah M. Memesh, Salih A. AlSoubhi e Iyad S. Zalmout. "Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges". Journal of Micropalaeontology 40, n. 2 (28 settembre 2021): 145–61. http://dx.doi.org/10.5194/jm-40-145-2021.

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Abstract. The Rashrashiyah Formation of the Sirhan Basin in northern Saudi Arabia contains diverse assemblages of planktonic foraminifera. We examined the biostratigraphy, stratigraphic range and preservation of upper Eocene planktonic foraminifera. Assemblages are well-preserved and diverse, with 40 species and 11 genera. All samples are assigned to the Priabonian Globigerinatheka semiinvoluta Highest Occurrence Zone (E14), consistent with calcareous nannofossil biostratigraphy indicating Zone CNE17. Well-preserved planktonic foraminifera assemblages from the lower part of the upper Eocene are rare worldwide. Our study provides new insights into the stratigraphic ranges of many species. We find older (Zone E14) stratigraphic occurrences of several species of Globoturborotalita previously thought to have evolved in the latest Eocene (Zone E15, E16) or Oligocene; these include G. barbula, G. cancellata, G. gnaucki, G. pseudopraebulloides, and G. paracancellata. Older stratigraphic occurrences for Dentoglobigerina taci and Subbotina projecta are also found, and Globigerinatheka kugleri occurs at a younger stratigraphic level than previously proposed. Our revisions to stratigraphic ranges indicate that the late Eocene had a higher tropical–subtropical diversity of planktonic foraminifera than hitherto reported.

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Eberle, Jaelyn J., e David A. Eberth. "Additions to the Eocene Perissodactyla of the Margaret Formation, Eureka Sound Group, Ellesmere Island, Arctic Canada". Canadian Journal of Earth Sciences 52, n. 2 (febbraio 2015): 123–33. http://dx.doi.org/10.1139/cjes-2014-0195.

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We describe early Eocene (Wasatchian) occurrences of the isectolophid Homogalax, tapiroids Heptodon posticus, Heptodon cf. H. posticus, and Heptodon sp., as well as early middle Eocene (Bridgerian) fossils of the brontothere Palaeosyops from localities in the Margaret Formation of the Eureka Sound Group on Ellesmere Island, Nunavut, Arctic Canada. Their occurrence on Ellesmere Island considerably extends the geographic range of these taxa, previously known from mid-latitude localities in British Columbia (only Heptodon), the Western Interior of the United States, and Asia (Homogalax, Heptodon, and Palaeosyops). We also place the fossil localities near Bay Fiord on central Ellesmere Island into a refined lithostratigraphic framework based upon data from three measured stratigraphic sections. Our stratigraphic data confirm the presence of two, stratigraphically distinct fossil assemblages — a late Wasatchian-aged lower assemblage and a Bridgerian-aged upper assemblage that were previously hypothesized by others based on faunal differences — that are separated by a 478 m thick stratigraphic gap that appears to lack fossil vertebrates. From a paleoenvironmental perspective, occurrence of the tapiroid Heptodon in the Eocene Arctic corroborates an hypothesis put forward by others that tapiroids are proxies for densely forested habitats, although they were adapted to a range of temperatures including near (or at) freezing temperatures of Eocene Arctic winters. Further, Arctic occurrences of tapiroids and brontotheres imply that these typical mid-latitude ungulate mammals were adapted to Arctic environments, thereby increasing the probability of Trans-Beringian dispersal during early and middle Eocene time.

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Reinhardt, Lutz, Werner von Gosen, Andreas Lückge, Martin Blumenberg, Jennifer M. Galloway, Christopher K. West, Markus Sudermann e Martina Dolezych. "Geochemical indications for the Paleocene-Eocene Thermal Maximum (PETM) and Eocene Thermal Maximum 2 (ETM-2) hyperthermals in terrestrial sediments of the Canadian Arctic". Geosphere 18, n. 1 (7 gennaio 2022): 327–49. http://dx.doi.org/10.1130/ges02398.1.

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Abstract During the late Paleocene to early Eocene, clastic fluvial sediments and coals were deposited in northern high latitudes as part of the Margaret Formation at Stenkul Fiord (Ellesmere Island, Nunavut, Canada). Syn-sedimentary tectonic movements of the Eurekan deformation continuously affected these terrestrial sediments. Different volcanic ash layers occur, and unconformities subdivide the deposits into four sedimentary units. Rare vertebrate fossils indicate an early Eocene (Graybullian) age for the upper part of the Stenkul Fiord outcrop. Here, we present carbon isotope data of bulk coal, related organic-rich mud and siltstones, a plant leaf wax-derived alkane, and additional plant remains. These data provide a complete carbon isotope record of one stratigraphic section with defined unconformity positions and in relation to other Eurekan deformation features. A previously dated ash layer MA-1 provided a U-Pb zircon age of 53.7 Ma and is used as a stratigraphic tie point, together with a discrete negative carbon isotope excursion found above MA-1 in a closely sampled coal seam. The excursion is identified as the likely expression of the I-1 hyperthermal event. Based on our isotope data that reflect the early Eocene dynamics of the carbon cycle, this tie point, and previous paleontological constraints from vertebrate fossils, the locations of the Paleocene-Eocene Thermal Maximum (PETM) and Eocene Thermal Maximum 2 (ETM-2) hyperthermals and their extent along the complete section are herein identified. Within the intervals of the PETM and ETM-2 hyperthermal events, increasing amounts of clastic sediments reached the site toward the respective end of the event. This is interpreted as a response of the fluvial depositional system to an intensified hydrological system during the hyperthermal events. Our study establishes an enhanced stratigraphic framework allowing for the calculation of average sedimentation rates of different intervals and considerations on the completeness of the stratigraphic record. As one of the few high-latitude outcrops of early Eocene terrestrial sediments, the Stenkul Fiord location offers further possibilities to study the effects of extreme warming events in the Paleogene.

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Mitrovic-Petrovic, Jovanka. "Paleoecological features and stratigraphic significance of the Genus Conoclypus, Echinoidea". Annales g?ologiques de la Peninsule balkanique, n. 64 (2002): 89–105. http://dx.doi.org/10.2298/gabp0264089m.

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Five species and a subspecies of the genus Conoclypus from Eocene formations of Croatia and Herzegovina are presented in this paper. Morphology of the genus is analysed. The given paleoecological conclusions are based on morphological data, character of sedimentary rocks containing Conoclypus, associated fauna and mechanical and biotic damages. Stratigraphic significance of this genus is emphasized, because it appeared, flourished, and disappeared in the Eocene period.

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Birgenheier, L. P., M. D. Vanden Berg, P. Plink-Björklund, R. D. Gall, E. Rosencrans, M. J. Rosenberg, L. C. Toms e J. Morris. "Climate impact on fluvial-lake system evolution, Eocene Green River Formation, Uinta Basin, Utah, USA". GSA Bulletin 132, n. 3-4 (19 giugno 2019): 562–87. http://dx.doi.org/10.1130/b31808.1.

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Abstract In light of a modern understanding of early Eocene greenhouse climate fluctuations and new highly seasonal fluvial system faces models, the role of climate in the evolution of one classically-cited continental, terminal lake system is re-examined. Detailed stratigraphic description and elemental abundance data from fifteen cores and seven outcrop regions of the Green River Formation were used to construct a ∼150 km cross section across the Uinta Basin, Utah, USA. Lake Uinta in the Uinta Basin is divided into five lake phases: (1) post-Paleocene Eocene Thermal Maximum, (2) peak Eocene hyperthermal, (3) waning hyperthermal, Early Eocene Climatic Optimum (EECO), (4) post-hyperthermal, and (5) post-EECO regimes, based primarily on climatically driven changes in fluvial style in combination with sedimentary indicators of lacustrine carbonate deposition, organic matter preservation, salinity, and lake depth. Basinwide siliciclastic dominated intervals were deposited by highly seasonal fluvial systems and record negative organic carbon isotope excursions associated with early Eocene abrupt, transient global warming (hyperthermal) events. Carbonate dominated or organic rich intervals record stable, less seasonal climate periods between hyperthermals, with lower siliciclastic sediment supply allowing the development of carbonate and organic matter preservation. The stratigraphic progression from alternating organic rich and lean zones to the overlying organic rich Mahogany and R8 zones represents the global transition out of the pulsed early Eocene hyperthermal climate regime to a time of sediment starvation and lake stratification, sequestering sedimentary organic carbon. This study provides a novel approach to terrestrial paleoclimate reconstruction that relies largely on unique sedimentary indicators and secondarily on isotopic proxy records within the context of a large basin-wide sedimentologic and stratigraphic data set, thus setting the stage for future detailed geochemical terrestrial paleoclimate proxy development.

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Siyako, M., e O. Huvaz. "Eocene stratigraphic evolution of the Thrace Basin, Turkey". Sedimentary Geology 198, n. 1-2 (maggio 2007): 75–91. http://dx.doi.org/10.1016/j.sedgeo.2006.11.008.

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Higgs, Karen E., Stuart Munday, Anne Forbes, Erica M. Crouch e Matthew W. Sagar. "A geochemical and biostratigraphic approach to investigating regional changes in sandstone composition through time; an example from Paleocene–Eocene strata, Taranaki Basin, New Zealand". Geological Magazine 157, n. 9 (17 febbraio 2020): 1473–98. http://dx.doi.org/10.1017/s0016756819001596.

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AbstractA geochemical and biostratigraphic approach has been applied to investigate the spatial and stratigraphic variability of Palaeogene sandstones from key wells in Taranaki Basin, New Zealand. Chronostratigraphic control is predominantly based on miospore zonation, while differences in the composition of Paleocene and Eocene sandstones are supported by geochemical evidence. Stratigraphic changes are manifested by a significant decrease in Na2O across the New Zealand miospore PM3b/MH1 early Eocene zonal boundary, at approximately 53.5 Ma. The change in Na2O is associated with a decrease in baseline concentrations of many other major (MnO, CaO, TiO2) and trace elements, and is interpreted to reflect a significant change in sandstone maturity. Paleocene sandstones are characterized by abundant plagioclase (albite and locally Na–Ca plagioclase), significant biotite and a range of heavy minerals, while Eocene sandstones are typically quartzose, with K-feldspar dominant over plagioclase, low mica contents and rare heavy minerals comprising a resistant suite. This change could reflect a change in provenance from local plutonic basement during the Paleocene Epoch to relatively quartz- and K-feldspar-rich granitic sources during Eocene time. However, significant quartz enrichment of Eocene sediment was also likely due to transportation reworking/winnowing along the palaeoshoreface and enhanced chemical weathering, driven in part by long-term global warming associated with the Early Eocene Climatic Optimum. The broad-ranging changes in major-element composition overprint local variations in sediment provenance, which are only detectable from the immobile trace-element geochemistry.

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Venkatachala, B. S., C. Caratini, C. Tissot e R. K. Kar. "Palaeocene-Eocene marker pollen from India and tropical Africa". Journal of Palaeosciences 37, n. (1-3) (31 dicembre 1988): 1–25. http://dx.doi.org/10.54991/jop.1988.1595.

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The Palaeocene-Eocene epochs have witnessed a great floral diversification in tropical areas, which is also reflected in the pollen spectra. The important Indian stratigraphical marker taxa have been examined and a comparative study with extant material has provided botanical affinities to some of the taxa. Their comparison with those recorded in Africa leads to reflection on their palaeogeographical distribution. The stratigraphic ranges have been shown in the range chart. Some of the taxa common to India and Africa are: Retistephanocolpites williamsi, Spinizonocolpites spp., Tricolpites reticulatus, Proxapertites spp., Anacolosidites luteoides and Marginipollis spp. A number of Indian, as well as African taxa, are not recorded beyond the terminal Eocene; some of them could have migrated from India to other countries such as Gonystylus (Cryptopolyporites) to Malaysia and Gunnera (Tricolpites reticulatus) to Australia. The relative location and motion of India during these epochs could explain the singularity of the Early Tertiary Indian palynoflora.

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Carter, Burchard D., e Michael L. McKinney. "Eocene echinoids, the Suwannee Strait, and biogeographic taphonomy". Paleobiology 18, n. 3 (1992): 299–325. http://dx.doi.org/10.1017/s0094837300010861.

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Faunal similarity among regions is often used as a means of identifying regions of endemism in fossil faunas. At least two large-scale taphonomic effects can affect apparent faunal similarity: stratigraphic and facies mismatching. In stratigraphic mismatching, an unconformity represents removal of most or all of a complete assemblage zone in one region, and the constituent taxa are mistakenly interpreted as having never inhabited that region. In facies mismatching, environmental differences between two regions (possibly unrecognized) cause the inference of a barrier that never existed. The two types of mismatching can work in concert if a facies was originally represented in a single stratigraphic interval that has been completely removed from one region. Analysis of faunal similarity via multivariate analysis of individual localities, coupled with comparison of the regions as single samples, may indicate mismatching if the results differ significantly.We view these two problems as part of a suite of taphonomic effects that are not evident in paleobiological analyses of smaller geographic scope. First, there is ambiguity in the notion of “barrier,” even when a candidate is obvious. Second, barriers in paleobiogeography are often hidden and must be inferred from their effects rather than observed. Third, stratigraphic and facies mismatching produce effects on regional faunas similar to those produced by barriers. Anyone using barriers to explain faunal disruptions should address these three points.Upper Eocene faunas of central Florida seem taxonomically distinct from those of the remainder of the Gulf Coastal Plain. This has historically been attributed to a known paleogeographic feature, the Suwannee Strait, which acts as a barrier. The amount of dissimilarity of the echinoid faunas is greater than the amount predicted as a result of sampling problems. Comparison of the results of multivariate and whole-region analyses suggests that mismatching of the two faunas, rather than a true barrier, causes the distinction. Principally facies, but also strata are mismatched. Early Late Eocene faunas inhabited terrigenous sands to the north of the strait and carbonate sands to the south and show the highest distinctiveness. Middle Late Eocene faunas inhabited primarily carbonate sands to the south and both carbonate sands and muds to the north. Overall similarity is higher for both local and regional analyses, and the faunas of northern sands are more similar to those of the southern region than to the northern mud faunas. Overall similarity across the strait is highest in the late Late Eocene strata when both regions had carbonate mud and sand facies. The faunas exhibit greater similarity within facies than they do within regions. Upper Late Eocene strata are poorly preserved north of the strait because of post-Eocene erosion.

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Più fonti

Tesi sul tema "Stratigraphic Eocene"

Byrnes, Mark Edward. "Provenance study of late Eocene arkosic sandstones in southwest and central Washington". PDXScholar, 1985. https://pdxscholar.library.pdx.edu/open_access_etds/3405.

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The purpose of this study is to compare the sandstone composition and trace element geochemistry between samples representing the Summit Creek sandstone, Naches, Chumstick, and Carbonado Formations in order to determine if these sediments were all derived from the same provenance, and to determine the composition of the source rocks in hopes to identify the present day location of the source areas.

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McClincy, Matthew John. "Tephrostratigraphy of the middle Eocene Chumstick Formation, Cascade Range, Douglas County, Washington". PDXScholar, 1986. https://pdxscholar.library.pdx.edu/open_access_etds/3633.

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This study outlines the ash (tuff) bed stratigraphy (tephrostratigraphy) in the middle Eocene Chumstick Formation of central Washington. The tuff beds provide local marker beds enabling interpretation of the stratigraphy and structure of the formation. The chemical signature of these units provides the basis on which the units can be traced over broad areas in the basin of deposition. Correlations of tuff beds were obtained over distances of 41 km.

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Cunderla, Brent Joseph. "Stratigraphic and petrologic analysis of trends within the Spencer Formation sandstones : from Corvallis, Benton County, to Henry Hagg Lake, Yamhill and Washington counties, Oregon". PDXScholar, 1986. https://pdxscholar.library.pdx.edu/open_access_etds/3588.

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Within the thesis study area Spencer Formation arkosic/arkosic lithic sandstone lithofacies of Narizian age crop out in a sinuous north-northwesterly band from the Corvallis area into the Henry Hagg Lake vicinity ten kilometers southwest of Forest Grove, Oregon.

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Vinyoles, i. Busquets Andreu. "Sediment routing systems of the Eocene Tremp-Jaca basin: Stratigraphic analysis and numerical models". Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/672479.

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The Eocene South-Pyrenean foreland basin provides a continuum of outcrops representing a Source to Sink sediment routing system from subaerial canyons to deep marine environments. On this context, the specific objective of this study is: (a) to contribute to the knowledge of the chronostratigraphy and the basin infill of the study area; (b) to analyze the evolution of the sedimentation rates on the Tremp-Jaca basin; and (c) to generate numerical models to (i) assess the sediment routing and sediment balance and, (ii) to evaluate the basin response to the propagation of climatic and tectonic signals. Two new magnetostratigraphic sections are built on the Tremp-Jaca basin; the Olsón (Ainsa basin) and the Yebra de Basa sections (Jaca basin). The Olsón section provides a late Lutetian to early Priabonian age for the Escanilla formation in the Ainsa basin, and the same age range is provided on the Yebra de Basa section for the strata encompassed between the Sabiñánigo sandstone and the Santa Orosia formation. The age constrains provided by these new sections and the data sorted from a systematic review of the literature have been used for an analysis of the sedimentation rates in the Tremp-Jaca basin. The studied sections were decompacted by backstripping to correct the differential burial compactions between the sections. This study shows that sedimentation rates may not show the expected variations related to depozone distribution. This lack of correlation between the depozones and the sedimentation rates are consequence of the lagged response to deformation front shifts and the complexity in the structure of the wedge-top. This complexity result in a widespread subsidence related to the emplacement of basement units in the hinterland. Also underfilled forelands may develop high sedimentation rates in the initial stages of wedge-top as basin gradients are a continuation to those developed in the previous foredeep phase. Sedimentation rates in overfilled areas are controlled by accommodation. In underfilled areas, the main control is clastic supply. During graded shelf regressive stages, maximum sedimentation rates are in foreset areas. In the transgressive stages, maximum sedimentation rates are at the topset. In out-of-grade periods, high sedimentation rates are in deep marine areas. The results obtained above have been used to feed forward stratigraphic models, using Dionisos software, to test and understand the different parameters affecting the sedimentary infill of the basin. A first model on the sediment routing systems of the Tremp-Jaca basin, based on the data from the sedimentation rates analysis, succeeds on reproducing the sedimentary routes that can be deduced from the paleocurrent patterns on the Tremp-Jaca basin, validating the inputted data. A second forward stratigraphic model, based on architectural and cyclostratigraphic analysis from previous works, determines that the high-frequency Milankovitch cyclicity of the Belsué-Atarés delta (Sierras Exteriores) is primarily forced from the sediment supply and secondary from the eustasy.
A les conques Eocenes Sudpirenaiques d’avantpaís hi ha un continu d’afloraments representatius de les rutes sedimentàries del sistema Source to Sink, des de canons subaeris fins a ambients marins profunds. En aquest context, aquest estudi té com a objectiu (a) contribuir al coneixement de la cronoestratigrafia i el reompliment de les conques de l'àrea d'estudi; (b) analitzar l’evolució de les taxes de sedimentació a la conca de Tremp-Jaca; i (c) generar models numèrics per (i) avaluar les rutes sedimentàries i el balanç sedimentari i (ii) avaluar la resposta de la conca a la propagació de senyals climàtics i tectònics. S’han construït dues noves seccions magnetostratigràfiques a la conca de Tremp-Jaca; les seccions d’Olsón (conca d’Aïnsa) i de Yebra de Basa (conca de Jaca). La secció d’Olsón proporciona una edat Luteciana superior fins a Priaboniana inferior per a la part superior de la formació Escanilla a la conca d’Aïnsa. A la secció de Yebra de Basa s’obté la mateixa franja d’edat pels estrats entre el gres de Sabiñánigo i la formació de Santa Orosia . Les edats proporcionades per aquestes noves seccions i les dades obtingudes a partir d'una revisió sistemàtica de les dades publicades, s'han utilitzat per a una anàlisi de les taxes de sedimentació de la conca de Tremp-Jaca. Les seccions estudiades han estat descompactades per backstripping per corregir l’enterrament diferencial que resulta en estadis de compactació diferents entre les seccions estudiades. Aquest estudi mostra que les taxes sedimentaries poden no mostrar les variacions esperades en relació a la distribució de les depozones. Aquesta manca de correlació entre les depozones i les taxes de sedimentació són conseqüència del retard en la resposta als canvis en la posició del front de deformació al wedge-top. Aquesta complexitat resulta en l’expansió de la subsidència relacionada amb l’emplaçament d’unitats basals al hinterland. Aquesta complexitat resulta en una major subsidència relacionada amb l’apilament d’unitats basalts al hinterland. També les conques d'avantpaís underfilled poden desenvolupar altes taxes de sedimentació en els estadis inicials del wedge-top, ja que els gradients sedimentaris són la continuació dels desenvolupats a la fase de foredeep anterior. Les taxes de sedimentació a les àrees overfilled estan controlades per l’acomodació. A les àrees underfilled, el control principal és l’aport de sediments. Durant els episodis regressius de les plataformes gradades, les taxes de sedimentació màximes es donen al topset. En els períodes no-gradats, les taxes de sedimentació més elevades es troben a les àrees marines profundes. Els resultats obtinguts s’han utilitzat per alimentar dos forward stratigraphic models, utilitzant el software Dionisos, per provar i entendre els diferents paràmetres que defineixen el reompliment de la conca. Un primer model en els sistemes de rutes sedimentàries de la conca de Tremp-Jaca, basat en les dades provinents de l’anàlisi de les taxes de sedimentació, té èxit en reproduir les rutes sedimentàries que es poden deduir dels paleocorrents de la conca de Tremp-Jaca, validant les dades introduïdes. Un segon model, a partir de dades arquitecturals i cicloestratigràfiques de treballs previs, determina que les ciclicitats de Milankovitch d’alta freqüència del delta de Belsué-Atarés (Sierras Exteriores) són primàriament forçats per l’aport sedimentari i secundàriament per l’eustàcia.

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Schmidt, Rolf. "Eocene bryozoa of the St Vincent Basin, South Australia - taxonomy, biogeography and palaeoenvironments /". Title page, abstract and contents only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phs3491.pdf.

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Thesis (Ph.D.)--University of Adelaide, School of Earth and Environmental Sciences, Discipline of Geology and Geophysics, 2003?
Includes Publication list by the author as appendix A. "July 2003." Includes bibliographical references (leaves 308-324).

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Farr, Leonard Carl Jr. "Stratigraphy, diagenesis, and depositional environment of the Cowlitz Formation (Eocene), northwest Oregon". PDXScholar, 1989. https://pdxscholar.library.pdx.edu/open_access_etds/3905.

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The Upper Eocene Cowlitz Formation is exposed in surface outcrops southwest of the town of Vernonia, in Columbia County, Oregon. The Cowlitz Formation also occurs in the subsurface of the Mist gas field where its Clark and Wilson (C and W) sandstone member (informal) acts as a natural gas reservoir, and its upper Cowlitz mudstone member (informal) acts as a cap rock. Surface exposures and continuous core were studied in order to determine Cowlitz Formation stratigraphy, and its depositional environment. Fresh core samples were also studied petrographically, and with a scanning electron microscope, in order to determine the effects of diagenesis in the gas producing C and W sandstone member.

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Matoush, Joseph P. "The Stratigraphic, Sedimentologic, and Paleogeographic Evolution of the Eocene- Oligocene Grasshopper Extensional Basin, Southwest Montana". DigitalCommons@USU, 2002. https://digitalcommons.usu.edu/etd/6726.

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Grasshopper basin, located in southwest Montana, is an east-tilted graben bounded by the listric Muddy-Grasshopper fault and the Meriwether Lewis fault on the eastern and western margins of the basin, respectively. This basin contains a complex stratigraphy of intertonguing facies comprised of five unconformity-bounded sequences of Tertiary alluvial, flu vial, deltaic, and lacustrine sedimentary and volcanic rocks. Sequence 1 consists of the Challis volcanic Group (Middle Eocene). The sedimentary rocks of the Medicine Lodge beds (Late Eocene-Late Oligocene) represent sequence 2 and approximately 90% of the basin-fill within Grasshopper basin. Sequence 3 consists 11 of the Sedimentary Rocks of Everson Creek (Late Oligocene-Early Miocene), sequence 4 is represented by the Sedimentary Rocks of Bannack Pass (Middle-Late Miocene), and the Six Mile Creek Formation (Late Miocene?) corresponds to sequence 5. Sequence 2 is the synrift deposit for the Muddy-Grasshopper fault, and was dominated by lakes that filled axially by rivers from the north. Transverse sediment influx was present on small fan-delta complexes shed into the lake from the eastern margin and periodic large fluvial-dominated alluvial fan and deltaic deposition from the western margin. Paleocurrent analyses are consistent with these observations and show predominantly south-southeastward axial paleoflow directions with west-directed and east-directed paleoflow on the eastern and western margins, respectively. Petrologic studies, including sandstone petrography and conglomerate petrology, reveal a mixed "basement uplift" and "recycled orogen" tectonic provenance. These findings support a model for Eocene-Oligocene rifting characterized by moderate to high relief superimposed on the Cretaceous-Early Tertiary Sevier fold-and-thrust belt. Paleogeographic reconstructions of Grasshopper basin reveal the lack of a southern basin margin. A correlation of the basin-fill contained in the Medicine Lodge and Horse Prairie basins to the south with the Medicine Lodge beds (sequence 2) in Grasshopper basin suggests that each of these basins represents a third of a larger preexisting extensional basin that was partially dismembered by later phases of continued extension. Large extensional folds in Grasshopper basin had a small influence on facies architecture in the basin.

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Gregory, Kathryn Mary. "Late Eocene paleoaltitude, paleoclimate, and paleogeography of the Front Range region, Colorado". Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185985.

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Erosion beveled the Laramide Front Range uplift in Colorado to a surface of low relief by the end of the Eocene. This study uses paleobotanic climate analysis techniques to determine the paleoelevation of this regional surface by examining the overlying 34.9 Ma Florissant flora. Multiple regression models explaining 93.4% of the variance in mean annual temperature (MAT), 86.1% of the variance in growing season precipitation (GSP) and 65.7% of the variance in rainfall distribution were derived from J. A. Wolfe's dataset of 31 leaf physiognomic character states from 86 modern vegetation sites. When applied to a new collection of 29 species from the Florissant flora, estimates of MAT = 10.7 ± 1.5°C, and GSP = 55.6 ± 12.5 cm, with precipitation occurring mostly during the growing season, are derived. This paleoclimate estimate is corroborated by data from late Eocene Sequoia affinis from Florissant. Higher mean ring width of the fossil trees as compared to modern counterparts can be explained by a climate with summer mean monthly temperatures ≥ 14°C and summer mean monthly rainfall >1.5 cm. The estimated MAT, when combined with coeval sea level MAT and terrestrial lapse rate, implies an elevation of 2.3-3.3 km for Florissant, which is indistinguishable from the modern elevation of 2.5 km. The elevation of Florissant is tied to that of the Great Plains by the Wall Mountain Tuff, so the Great Plains were also high. The elevation was created either by underplating and/or mass transfer in the Laramide, or by mantle uplift of crust thickened by pre-Laramide tectonics. This elevation estimate implies that: (1) Pliocene uplift is not required to explain the present elevation. Thus, late Tertiary plateau uplift in the western US was not a contributing factor to the marked global cooling since 15 Ma; and (2) in the late Eocene, regional surfaces of planation could be formed at elevations significantly above sea level but below tree line. The surface was possibly formed from a lack of storminess; a preponderance of small storm events will diffusively smooth topography.

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Ressel, Michael W. "Igneous geology of the Carlin Trend, Nevada the importance of Eocene magmatism in gold mineralization /". abstract and full text PDF (free order & download UNR users only), 2005. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3210296.

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Robinson, Andrew Mark. "Stratigraphic development and controls on the architecture of Eocene depositional systems in the Faroe-Shetland Basin". Thesis, Cardiff University, 2004. http://orca.cf.ac.uk/55054/.

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A detailed investigation of the Eocene stratigraphy in the Faroe-Shetland Basin was undertaken with a view to developing a basin-wide seismic-stratigraphic framework in order to describe the palaeogeographic evolution and depositional architecture of the basin. This study has tested the applicability of sequence stratigraphy on a regional and local scale and outlines the major depositional controls on the succession. Integration of seismic, well and biostratigraphic data has allowed for the identification of four regionally correlatable seismic-stratigraphic units which document the basin fill history. Depositional systems are controlled by the interaction of fluctuating relative sea-level and local tectonic controls. Early Eocene uplift on compressional fold structures, inherited Mesozoic palaeobathymetry, dynamic uplift from mantle plume activity and prograding lava deltas all control the distribution, thickness and facies of the Eocene succession. Case studies from a basin margin and intra-basinal setting have provided detailed evidence of the localised sedimentary response to changing basin conditions. The use of high resolution 3-D seismic data has enabled depositional sequences and the complex seismic geomorphology of palaeo-drainage systems to be recognised. A cyclicity of sedimentary response is observed in a deltaic environment which documents the evolution of relative sea-level on the southern margin of the basin. Classical sequence-stratigraphic techniques have, in places, provided a useful guide to stratigraphic interpretation and analysis. However, attempts to test the widely used sequence stratigraphic model of sequences as regionally correlatable stratigraphic surfaces have failed largely because of the impracticability of correlating seismic reflections on a regional scale. The conclusion from this is that sequence stratigraphy is a powerful analytical tool that can be applied locally, but is likely to encounter significant difficulties on a basinal length scale. This larger scale correlatability is a corollary of the link between sequence development and eustatic sea level changes. In this thesis, this link cannot be substantiated, and local factors predominate.

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Più fonti

Libri sul tema "Stratigraphic Eocene"

Charles, Pomerol, Premoli-Silva I e International Geological Correlation Programme. Project no. 174 on "Geological Events at the Eocene-Oligocene Boundary.", a cura di. Terminal Eocene events. Amsterdam: Elsevier, 1986.

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Zágoršek, Kamil. Eocene bryozoa from Hungary. Frankfurt am Main: Senckenbirgische Naturforschende Gesellschaft, 2001.

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The Eocene-Oligocene transition: Paradise lost. New York: Columbia University Press, 1994.

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Hall, Wayne Everett. Eocene cauldron, batholith, and hydrothermal alteration west of Ketchum, Idaho. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1986.

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Huddlestun, Paul F. Upper eocene stratigraphy of central and eastern Georgia. Atlanta: Dept. of Natural Resources, Environmental Protection Division, Georgia Geologic Survey, 1986.

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1959-, Koeberl Christian, e Montanari Alessandro, a cura di. The late Eocene Earth: Hothouse, icehouse, and impacts. Boulder, Colo: Geological Society of America, 2009.

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Roehler, Henry W. Description and correlation of Eocene rocks in stratigraphic reference sections for the Green River and Washakie basins, Southwest Wyoming : includes analyses of Eocene rocks in the Washakie Basin. Washington: U.S. G.P.O., 1992.

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Squires, Richard L. Paleontology and stratigraphy of Eocene rocks at Pulali Point, Jefferson County, eastern Olympic Peninsula, Washington. [Olympia, Wash.]: Washington State Dept. of Natural Resources, Division of Geology and Earth Resources, 1992.

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F, Gunnell Gregg, a cura di. Eocene biodiversity: Unusual occurrences and rarely sampled habitats. New York: Kluwer Academic/Plenum Publishers, 2001.

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Johnson, Samuel Y. Stratigraphy, sedimentology, and provenance of the Raging River Formation (Early? and Middle Eocene), King County, Washington. Washington: U.S. G.P.O., 1994.

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Capitoli di libri sul tema "Stratigraphic Eocene"

AlRefaei, Yaqoub, Ali Najem, Aimen Amer e Faisal Al-Qattan. "Surface Geology of Kuwait". In The Geology of Kuwait, 1–26. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-16727-0_1.

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AbstractThis chapter represents a comprehensive review of Kuwait’s surface geology and stratigraphy from previous works accomplished by numerous geoscience researchers in the past decades. The surface of Kuwait is characterized by nearly flat topography, featureless to gently undulating, apart from a few tens of meters of escarpments in the north and south, and flat low to moderately elevated hills and ridges. It predominantly consists of siliciclastic sediments and sedimentary rock units ranging in age from Middle Eocene to Holocene. The main stratigraphic exposed successions are located in Jal Az-Zor escarpment, Al-Subyiah (Bahrah) area, Ahmadi Quarry, the Khiran Ridges, and the Enjefa Beach. The oldest exposed rock units are represented by the Middle Eocene Dammam Formation, which is exposed at the Ahmadi Quarry, whereas the youngest recent deposits cover most of Kuwait’s surficial area and lie on top of the Kuwait Group’s deposits. This chapter will illustrate the geology and stratigraphy of Kuwait's surface sediments and sedimentary rock strata. Recommendations and future insights were also documented as part of the way forward to improve the presently available work for the surface geology of Kuwait.

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Coffey, Brian P. "Sequence Stratigraphic Influence on Regional Diagenesis of a Mixed Carbonate-Siliciclastic Passive Margin, Eocene, N.C., USA". In Linking Diagenesis to Sequence Stratigraphy, 81–103. West Sussex, UK: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118485347.ch4.

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Ameen, Fadhil, e Fawzi Mardan. "Sequence Stratigraphic Analysis of the Middle Paleocene-Middle Eocene in the Sulaimani District (Kurdistan Region), North Iraq". In Paleobiodiversity and Tectono-Sedimentary Records in the Mediterranean Tethys and Related Eastern Areas, 207–9. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-01452-0_50.

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Marfil, R., H. Mansurbeg, D. Garcia, M. A. Caja, E. Remacha, S. Morad, A. Amorosi e J. P. Nystuen. "Dolomite-Rich Condensed Sections in Overbank Deposits of Turbidite Channels: The Eocene Hecho Group, South-Central Pyrenees, Spain". In Linking Diagenesis to Sequence Stratigraphy, 207–29. West Sussex, UK: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118485347.ch9.

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Mansurbeg, H., S. Morad, P. Plink-Björklund, M. A. K. El-Ghali, M. A. Caja e R. Marfil. "Diagenetic Alterations Related to Falling Stage and Lowstand Systems Tracts of Shelf, Slope and Basin Floor Sandstones (Eocene Central Basin, Spitsbergen)". In Linking Diagenesis to Sequence Stratigraphy, 353–78. West Sussex, UK: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118485347.ch15.

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Scott, Jennifer Jane, e Michael Elliot Smith. "Trace Fossils of the Eocene Green River Lake Basins, Wyoming, Utah, and Colorado". In Stratigraphy and Paleolimnology of the Green River Formation, Western USA, 313–50. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9906-5_12.

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Śliwinska, Kasia K., Stefan Schouten e Karen Dybkjær. "Lower Eocene to Lower Miocene Stratigraphy and Palaeoenvironment of ODP Site 643A, Norwegian Sea". In Springer Geology, 143–47. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_29.

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ALI, JASON R., e ERNIE A. HAILWOOD. "MAGNETOSTRATIGRAPHY OF UPPER PALEOCENE THROUGH LOWER MIDDLE EOCENE STRATA OF NORTHWEST EUROPE". In Geochronology, Time Scales, and Global Stratigraphic Correlation, 275–79. SEPM (Society for Sedimentary Geology), 1995. http://dx.doi.org/10.2110/pec.95.04.0275.

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AUBRY, MARIE-PIERRE. "FROM CHRONOLOGY TO STRATIGRAPHY: INTERPRETING THE LOWER AND MIDDLE EOCENE STRATIGRAPHIC RECORD IN THE ATLANTIC OCEAN". In Geochronology, Time Scales, and Global Stratigraphic Correlation, 213–74. SEPM (Society for Sedimentary Geology), 1995. http://dx.doi.org/10.2110/pec.95.04.0213.

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Armentrout, John M. "Tectonics and paleogeography of a post-accretionary forearc basin, Coos Bay area, SW Oregon, USA". In From Terranes to Terrains: Geologic Field Guides on the Construction and Destruction of the Pacific Northwest, 187–243. Geological Society of America, 2021. http://dx.doi.org/10.1130/2021.0062(06).

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ABSTRACT This field guide reviews 19 sites providing insight to four Cenozoic deformational phases of the Cascadia forearc basin that onlaps Siletzia, an oceanic basaltic terrane accreted onto the North American plate at 51–49 Ma. The field stops visit disrupted slope facies, prodelta-slope channel complexes, shoreface successions, and highly fossiliferous estuarine sandstones. New detrital zircon U-Pb age calibration of the Cenozoic formations in the Coos Bay area and the Tyee basin at-large, affirm most previous biostratigraphic correlations and support that some of the upper-middle Eocene to Oligocene strata of the Coos Bay stratigraphic record represents what was differentially eroded off the Coast Range crest during ca. 30–25 Ma and younger deformations. This suggests that the strata along Cape Arago are a western “remnant” of the Paleogene Tyee basin. Zircon ages and biostratigraphic data encourages the extension of the Paleogene Coos Bay and Tyee forearc basin westward beyond the Fulmar fault and offshore Pan American and Fulmar wells. Integration of outcrop paleocurrents with anisotropy of magnetic susceptibility data from the middle Eocene Coaledo Formation affirms south-southeast to north-northwest sediment transport in current geographic orientation. Preliminary detrital remanent magnetism data show antipodal directions that are rotated clockwise with respect to the expected Eocene field direction. The data suggest the Eocene paleo-shoreline was relatively north-south similar to the modern shoreline, and that middle Eocene sediment transport was to the west in the area of present-day Coos Bay. A new hypothesis is reviewed that links the geographic isolation of the Coos Bay area from rivers draining the ancestral Cascades arc to the onset of uplift of the southern Oregon Coast Range during the late Oligocene to early Miocene.

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Atti di convegni sul tema "Stratigraphic Eocene"

Nirsal, N. "New Perspectives on the Stratigraphy of the Andaman Trough, offshore North Sumatra, Indonesia. Utilising Modern Quantitative Biostratigraphical Analysis, Integrated with Newly Acquired 3D Multi Client Seismic Data". In Indonesian Petroleum Association 44th Annual Convention and Exhibition. Indonesian Petroleum Association, 2021. http://dx.doi.org/10.29118/ipa21-g-31.

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The Andaman Trough, located offshore North Sumatra is currently defined as an emerging basin for exploration. Its location primarily in a remote deep-water environment has resulted in limited well data being acquired to date and although there has historically been abundant seismic data, imaging of pre-Miocene stratigraphy has been poor. New seismic data, including the regional PGS NSMC3D and proprietary and multi-client 2D reprocessed data, combined with high resolution biostratigraphical analysis, has enabled extrapolation of the stratigraphy from the well explored and established shelfal areas down into the deep-water areas. To establish the high-resolution stratigraphic framework, paleo-environment, and paleo-climate for the well penetrations in the Andaman Trough, re-evaluation of quantitative and semi-quantitative abundance charts based on nannofossil, micropaleontology, and palynology zonation and sequences was conducted. Integration of this updated biostratigraphic analysis with interpretation from the modern regional seismic datasets enabled the identification of and confirmation of sequence boundaries and flooding surfaces across the Andaman Trough. Insights into timing of rifting, uplift, and erosion were made, as well as an interpretation of depositional environments, paleo-bathymetry and paleo-climate throughout the Andaman Trough. Significant findings include the chronostratigraphic separation of Late Oligocene Parapat fluvialtile deposits from the overlying Bampo marine turbidites, absent or incomplete Bampo Formation penetrated by some wells, as well as the delineation of a previously unidentified Eocene unconformity and revised timing of basin formation. Further insights into source rock development for the Eocene stratigraphic package were also developed.

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Catlin, T. J., E. González Guzmán e M. Stredel. "Stratigraphic Framework for the Eocene, South-West of Lake Maracaibo, Venezuela". In 5th Simposio Bolivariano - Exploracion Petrolera en las Cuencas Subandinas. European Association of Geoscientists & Engineers, 1994. http://dx.doi.org/10.3997/2214-4609-pdb.116.007eng.

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Chowdhury, Manabesh, Arun Babu Nalamara, VR Sunder, Pankaj Kumar, Pinakadhar Mohapatra e Savitri Roy. "Utilization of Spectral Gamma Ray Logs to Ascertain Stratigraphic Surfaces in Carbonate Reservoir and Integration with Seismic Interpretation: An Integrated Case Study from Eocene-Oligocene Carbonate Reservoirs, D31 Cluster, Mumbai Offshore Basin, India". In SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205709-ms.

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Abstract D31 cluster is located in the prolific Mumbai Offshore Basin, Western part of India. B-192Afield is part of this cluster, where Bassein (Middle Eocene),Mukta and Panvel (Early Oligocene)Formations are the main reservoirs. The reservoirs are complex in terms of reservoir heterogeneity. They were deposited in a shallow marine carbonate platform.Sea level fluctuations andchange in depositional environment impacted the porosity development. The main objective of this study was to integrate spectral gamma ray signatures with seismic interpretation for demarcating significant stratigraphic surfaces and differentiating depositional environments for robust reservoir characterization. Regionally, Bassein Formation (Middle Eocene) is characterized by thick foraminiferal and algal wackestone, packstone and occasional grainstone facies.The Mukta Formation (Early Oligocene),which unconformably overlies the Bassein Formation, is characterized by presence of fossiliferous limestone with shale intercalations. In the present study, data from four exploration wells data have been analyzed, where spectral gamma ray log patterns in carbonate reservoirs appear to have a distinctive relationship to depositional facies and stratigraphic surfaces in the Bassein and Mukta Formations. Different cross plots have also been utilized for analyzing the depositional conditions (i.e. oxic or anoxic).Later, the spectral log interpretations have been integrated with seismic interpretation. This study is part of a larger effort for reservoir characterization, as a basis for seismic interpretation and integrated reservoir modelling. The spectral gamma ray signatures demarcated significant stratigraphic surfaces. In BasseinFormation, three different units have been marked as Upper, Middle and Lower Bassein. The major lithological boundary between the Bassein and Mukta Formation is also well demarcated with spectral GR signature. The carbonate strata of Bassein & Mukta Formation have also been subdivided with U-Th-K abundance.The "Low Th-Low U" units indicative of pure carbonate and deposition in oxidizing environment whereas "Low Th-High U"is indicative ofreducing environment, which gave a relative sea level fluctuation in the area.The major stratigraphic boundaries identified from these spectral GR logs has been incorporated in the seismicinterpretation and used for regional seismic mapping.As porosity development is governed by thesea level fluctuations,this study also gave an indication of the possibility of porous zonein the reservoir section. These results can be useful as a basis for applying spectral GR signature as a tool for stratigraphic interpretation in un-cored heterogenous carbonate sections. Along with the petrophysical interpretation, integration of core analysis, biostratigraphy and seismic attribute are critical for detailed carbonate reservoir characterization incorporating depositional environment.This approach can be applied to support commercial development of the complex carbonate reservoirs.

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Habermann, Leonardo, Maria Gabriela Castillo Vincentelli, Sergio Antonio CÁceres Contreras e José Alexandre de Jesus Perinotto. "Structural and Stratigraphic characterization of Eocene Turbidites in the Southwest portion of Campos Basin, Brazil". In 15th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 31 July-3 August 2017. Brazilian Geophysical Society, 2017. http://dx.doi.org/10.1190/sbgf2017-044.

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Abdalla, Muneer A., e Wan Yang. "SEQUENCE STRATIGRAPHIC ARCHITECTURE OF LOWER AND MIDDLE EOCENE CARBONATE PLATFORM, SIRTE BASIN, NORTH CENTRAL LIBYA". In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-337334.

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Laya, A. E., e L. Camposano. "Chemostratigraphical Characterization of Stratigraphic Sequences: Upper B Sandstones of Eocene Misoa Formation, Maracaibo Basin, Western Venezuela". In SPE Latin American and Caribbean Petroleum Engineering Conference. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/177100-ms.

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Foreman, Brady Z. "COMPARISON OF FLUVIAL RESPONSE TO EOCENE HYPERTHERMALS WITH GENERAL STRATIGRAPHIC OUTPUTS FROM 2-D NUMERICAL MODELS". In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-277540.

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Khisty, Anjali Malati, Diane I. Doser, Diane I. Doser, Rob Rohrbaugh, Rob Rohrbaugh, Aimee Garcia, Aimee Garcia, Gage Richards Lamborn e Gage Richards Lamborn. "STRATIGRAPHIC AND STRUCTURAL CONTROLS ON THE EMPLACEMENT OF EOCENE INTRUSIONS IN THE EL PASO, TEXAS REGION". In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-338770.

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Rahim, H. Ur. "Integrating Microfacies, Diagenesis and Sequence Stratigraphic Control On Reservoir Character of Eocene Sakesar Limestone, Nw Pakistan". In 83rd EAGE Annual Conference & Exhibition. European Association of Geoscientists & Engineers, 2022. http://dx.doi.org/10.3997/2214-4609.202210943.

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Utomo, R. "Unlocking The Complex Geology & Petroleum Systems; Efforts to Awakening The Sleeping Giant – A Prospectivity Rejuvenation Case Study of West Sebuku Block, South Makassar Basin, Indonesia". In Indonesian Petroleum Association 44th Annual Convention and Exhibition. Indonesian Petroleum Association, 2021. http://dx.doi.org/10.29118/ipa21-g-25.

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Significant uplift in the seismic imaging quality from the latest wide coverage of the Multi-Client Broadband PSDM 3D (MC3D) acquisition and processing, as well as cost and operational efficiencies, is an essential element to unlock the exploration potential of the under-explored South Makassar Basin. Many of exploration wells are usually drilled based on limited data, and structural closures are defined by sparse 2D seismic data and inadequate petroleum system models. Additional 3D seismic acquisition over the same area may enhance the structural imaging and provide a better understanding of the petroleum system. However, imaging the stratigraphic and structural complexities beneath carbonate platforms and steep slopes can be challenging and continued de-risk the plays. In 2018, Mubadala Petroleum requested PGS to acquire the first Multi-Client Broadband PSDM 3D survey in the South Makassar Basin. This MC3D survey has, for the first time, enabled imaging of well developed Eocene Platform carbonates and the Basement. Historical exploration and production activities with in the Basin have focused largely on the Oligocene aged carbonate debris flow deposits, as seen at Ruby Field. These new Eocene Platform carbonate and Basement plays have enabled Mubadala Petroleum to develop a significant exploration portfolio, revitalizing exploration activity in the Basin.

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Rapporti di organizzazioni sul tema "Stratigraphic Eocene"

Dafoe, L. T., K. J. DesRoches e G. L. Williams. A structural and stratigraphic framework for the western Davis Strait region. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/321831.

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Western Davis Strait lies within the Labrador-Baffin Seaway rift system, which began forming in the Early Cretaceous as Greenland separated from North America. At chron C27n (Danian), regional seafloor spreading began, as well as significant magmatism. The opening direction changed from southeast-northwest to more north-south in the Thanetian-Ypresian between chrons C25n and C24n, resulting in significant strike-slip motion through the Davis Strait region until seafloor spreading ended at chron C13, near the Eocene-Oligocene boundary. This tectonism has influenced the stratigraphy preserved in basins within western Davis Strait, including confirmed Cretaceous successions in the Lady Franklin Basin and Cumberland Sound; however, regional overprinting of Paleocene-Eocene volcanic rocks obscures pre-rift basement and possible older strata over much of the region. Three industry wells and several seabed samples of bedrock help constrain the stratigraphic distribution of Cretaceous and Cenozoic strata based on the lithostratigraphy of the well sampled Labrador margin.

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Ries, John E. A Proposed Model for Late Eocene Paleogeographic Transitions of Western Oregon and Washington Reconstructed from Stratigraphic Relationships, Facies Interpretation, and Paleoecological Analysis of Fossil Assemblages. Fort Belvoir, VA: Defense Technical Information Center, luglio 1989. http://dx.doi.org/10.21236/ada216266.

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Dafoe, L. T., K. Dickie, G. L. Williams e T. McCartney. Stratigraphy of the Labrador margin: a synthesis and new perspectives. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/321829.

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The Labrador Sea formed during rifting between North America and Greenland beginning in the Early Cretaceous, with subsequent seafloor spreading from the Maastrichtian (chron C31) to Early Paleocene (chron C27n) that ended by chron C13 (earliest Oligocene). Early Cretaceous rifting resulted in accumulation of Alexis Formation basalt units and Bjarni Formation nonmarine and marginal marine clastic rocks. In the Late Cretaceous, extension focused further offshore as sag basin conditions formed across the shelf, with a basinwide transgression of Markland Formation shale and localized Freydis Member sandstone development. A Middle Paleocene to Early Eocene regression formed Gudrid Formation shoreline sandstone units, with correlative Cartwright Formation marine shale units. This was followed by an Early Eocene transgression of the Kenamu Formation and Middle Eocene Leif Member shoreline development. During the Late Eocene through Pleistocene, transgression took place once again at the base of the Mokami Formation, with subsequent development of the partly correlative shallow-marine sandstone units of the Saglek Formation.

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Dafoe, L. T., G. L. Williams, K. Dickie, U. Gregersen, P. C. Knutz, G. Dam, G. K. Pedersen, H. Nøhr-Hansen, J. W. Haggart e K. J. DesRoches. Overview of the stratigraphy, paleoclimate, and paleoceanography of the Labrador-Baffin Seaway. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/321853.

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The tectonic evolution of the Labrador-Baffin Seaway began with Early Cretaceous extension between Greenland and North America, resulting in the development of basins infilled with nonmarine and shallow-marine clastic strata. The Late Cretaceous was a time of continued rifting and local subsidence, with deposition of widespread deeper water marine mud and localized sand deposits. Seafloor spreading began in the south in the Latest Cretaceous and propagated throughout the seaway by the Early Paleocene. Regional seafloor spreading coincided with the onset of significant volcanism in the Davis Strait to central West Greenland region, as well as a regional regression. A change in the spreading direction around the Paleocene- Eocene boundary, was accompanied by strike-slip motion in the Davis Strait and Baffin Bay, deformation and basin inversion, and development of regional unconformities. After seafloor spreading ceased in the late Eocene, the seaway was filled by upper Paleogene to Recent sediments, with clinoform progradation building the modern-day shelves.

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Farr, Leonard. Stratigraphy, diagenesis, and depositional environment of the Cowlitz Formation (Eocene), northwest Oregon. Portland State University Library, gennaio 2000. http://dx.doi.org/10.15760/etd.5789.

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Dafoe, L. T., K. Dickie e G. L. Williams. Stratigraphy of western Baffin Bay: a review of existing knowledge and some new insights. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/321846.

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Abstract (sommario):

Sedimentary basins within the Labrador-Baffin Seaway are the product of rifting between Greenland and the paleo-North American Plate. Rifting started in the Early Cretaceous, with seafloor spreading initiated in the Paleocene and ending near the Eocene-Oligocene boundary. A change in the spreading direction in the latest Paleocene resulted in transform offsets in the Davis Strait and along fracture zones in Baffin Bay, with deformation in northern Baffin Bay during the Eurekan Orogeny. Since the stratigraphy of western Baffin Bay is poorly constrained, analogues are used from the well studied Labrador and West Greenland margins and exposures on nearby Bylot Island. The generally northwest-trending basement structures are infilled with Cretaceous strata, which are overlain by a seaward-thickening wedge of post-rift Paleocene to Middle Miocene sedimentary rocks. Finally, a thick Middle Miocene and younger interval blankets the deep water and oceanic crust, with clinoforms locally developed on the shelf.

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Carr, S. D., e D. L. Parkinson. Eocene Stratigraphy, Age of the Coryell Batholith, and Extensional Faults in the Granby Valley, southern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127450.

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West-east stratigraphic correlations of surface and subsurface sections of the intertongued Eocene Wasatch and Green River formations, Wyoming. US Geological Survey, 1991. http://dx.doi.org/10.3133/mf2159.

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West-east stratigraphic correlations of surface and subsurface sections of the intertongued Eocene Wasatch and Green River formations, northern Green River basin, Wyoming. US Geological Survey, 1990. http://dx.doi.org/10.3133/mf2149.

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Eocene to Miocene biostratigraphy of New Jersey core ACGS #4; implications for regional stratigraphy. US Geological Survey, 1988. http://dx.doi.org/10.3133/b1829.

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