Relevant bibliographies by topics / Oligocene

Academic literature on the topic 'Oligocene'

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Published: 4 June 2021
Last updated: 22 June 2024

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Journal articles on the topic "Oligocene"

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Smith, R. "Insectivores (Mammalia) from the earliest Oligocene (MP 21) of Belgium." Netherlands Journal of Geosciences - Geologie en Mijnbouw 83, no. 3 (September 2004): 187–92. http://dx.doi.org/10.1017/s0016774600020254.

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AbstractInsectivore remains are not common in the Lower Oligocene of Europe. For this reason, the study of the earliest Oligocene insectivore fauna (MP 21) from Boutersem and Hoogbutsel, all together yielding nine species, representing five families, constitutes an important progress in the knowledge of the Late Eocene and Early Oligocene insectivore evolution. Some of the genera discovered in Belgium are known from upper Eocene sites (Saturninia, Amphidozotherium, Euronyctia, Eotalpa), whereas others are not known before the Oligocene (Butselia, Tetracus, Heterosoricinae ind.). The co-occurrence of primitive species of Nyctitheriidae with modern forms belonging to the Plesiosoricidae, Talpidae and Erinaceidae at the Eocene-Oligocene boundary suggests a transition fauna. Between the Priabonian (Late Eocene) and the Rupelian (Early Oligocene), the endemic European insectivores were in competition with the new immigrants. This faunal turnover is generally accepted as the ‘Grande Coupure’ event (the MP 21 event).
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Smith, R. "Insectivores (Mammalia) from the earliest Oligocene (MP 21) of Belgium." Netherlands Journal of Geosciences - Geologie en Mijnbouw 83, no. 3 (2004): 187–92. http://dx.doi.org/10.1017/s0016774600023489.

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AbstractInsectivore remains are not common in the Lower Oligocene of Europe. For this reason, the study of the earliest Oligocene insectivore fauna (MP 21) from Boutersem and Hoogbutsel, all together yielding nine species, representing five families, constitutes an important progress in the knowledge of the Late Eocene and Early Oligocene insectivore evolution. Some of the genera discovered in Belgium are known from upper Eocene sites (Saturninia, Amphidozotherium, Euronyctia, Eotalpa), whereas others are not known before the Oligocene (Butselia, Tetracus, Heterosoricinae ind.). The co-occurrence of primitive species of Nyctitheriidae with modern forms belonging to the Plesiosoricidae, Talpidae and Erinaceidae at the Eocene-Oligocene boundary suggests a transition fauna. Between the Priabonian (Late Eocene) and the Rupelian (Early Oligocene), the endemic European insectivores were in competition with the new immigrants. This faunal turnover is generally accepted as the ‘Grande Coupure’ event (the MP 21 event).
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Bui, Luan Thi. "PETROLEUM POTENTIAL OF SOURCE BEDS IN THE CUU LONG BASIN." Science and Technology Development Journal 14, no. 4 (December 30, 2011): 31–45. http://dx.doi.org/10.32508/stdj.v14i4.2025.

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In the Cuu Long basin, three source beds are identified: lower Miocene, Upper Oligocene, upper Eocene + lower Oligocene. They are separated from each other by sand-clay layers. Only Upper Oligocene and Upper Eocene + Lower Oligocene source beds are two main source beds supplying a great part of organic matter into traps. Petroleum source potential of Upper Oligocene source bed (66.30 billion tons) is greater than Upper Eocene + Lower Oligocene bed (29.88 billion tons). Total amount of hydrocarbon has ability to take part in accumulation process at the petroleumbearing traps from Upper Oligocene and Upper Eocene + Lower Oligocene source beds is over 2.19 billion tons and below 1.16 billion tons respectively. Thus, in whole CuuLong basin, source rocks have capacity to produce 96.18 billion tons of hydrocacbon in which accumulation is 3.35 billion tons making up 3.35% production quantity. Applying Monte - Carlo simulation method, using Crystal Ball software to calculate production potential and total amount of organic matter taking part into migration and accumulation process give rather appropriate result with difference level ≤ 1.25%.. Prospecting levels are in the following order: (i)Central lift zone has the greatest prospects, next is Dong Nai lift zone, graben located in north west inclined slope, south east inclined slope, north east area of Tam Dao lift zone finally. (2)Petroleum does not only accumulate in structural, combination traps but also in non-structural traps.
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Wade, Bridget S., and Heiko Pälike. "Oligocene climate dynamics." Paleoceanography 19, no. 4 (December 2004): n/a. http://dx.doi.org/10.1029/2004pa001042.

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Postgate, J., and F. G. Priest. "Putative oligocene spores." Microbiology 141, no. 11 (November 1, 1995): 2763–64. http://dx.doi.org/10.1099/13500872-141-11-2763.

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Tran, Huy Nhu, Xuan Van Tran, Kha Xuan Nguyen, Ngoc Ba Thai, Thanh Quoc Truong, Man Nguyen Tri Ho, Chuc Dinh Nguyen, and Lan Duc Tran. "Main favorable factorscreatee oligocene formation become a petroleum prospect in south-east area, Cuu Long basin." Science and Technology Development Journal 19, no. 1 (March 31, 2017): 169–79. http://dx.doi.org/10.32508/stdj.v19i1.515.

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The previous researchs almost demonstrated the reservoir in Lower Oligocene sandstone has complicated distribution, probably low porosity and permeability, no nature flow are seen by wells. Based on recent study results of depositional environment of E Oligocene sedimentary in Cuu Long basin and E sand distribution in blocks 01/10 & 02/10, block 09-2/09, block 09-2/10 and block 16-2 area, the paper determines depositional facies according to petrophysic and geophysic data. From Chrono-stratigraphy priciple, as well as interpretation and intergration of seismic data, well data, well log data, core & sample analysis results, petrophysic data, well test data, the paper forcuses on create correlation lines between wells and seismic line for confirming Oligocene E distribution in Cuu Long basin, buildup the gross mapping for depositional environment in sub-sequence Oligocene E upper and E lower and mapping of seismic attributes for sub-sequence Oligocene E upper and E lower.At last successfully predict the sand distribution in Oligocene E upper and E lower sub-sequence in research area and hence determine the stratigraphic traps in Oligocene formation of South-East area Cuulong basin.
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Prothero, Donald R. "North American mammalian diversity and Eocene–Oligocene extinctions." Paleobiology 11, no. 4 (1985): 389–405. http://dx.doi.org/10.1017/s0094837300011696.

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Diversity and faunal turnover of North American land mammals are calibrated against the magnetic polarity time scale for million-year intervals for the latest Eocene through late Oligocene. A major, gradual Late Eocene decline in diversity, caused mostly by an extended period of extinction of archaic forms, seems to be related to the worldwide crisis known as the “Terminal Eocene Event.” Along with other evidence of gradual changes in deep-sea microfossils, this evidence argues against a catastrophic explanation for late Eocene extinctions.Faunal stability characterized the rest of the Oligocene except for a wave of extinctions in the mid-Oligocene (Chadronian-Orellan boundary, about 32.4 ma). This mid-Oligocene event is sudden and severe, occurring in less than 200,000 yr, based on estimates from sedimentation rates calibrated from magnetic polarity interval boundaries. The mid-Oligocene event is found in many paleoclimatic records, but not in all of them. It may be related to the completion of the Circum-Antarctic Current and to increased mid-Oligocene glaciation.
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Gladenkov, Yu B. "The Oligocene of Sakhalin." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 234, no. 1-3 (December 22, 2004): 433–40. http://dx.doi.org/10.1127/njgpa/234/2004/433.

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Tsai, Cheng-Hsiu, Toshiyuki Kimura, and Yoshikazu Hasegawa. "Coexistence of Oligocene toothed and baleen-assisted mysticetes in the northwestern Pacific." Fossil Record 27, no. 1 (January 11, 2024): 95–100. http://dx.doi.org/10.3897/fr.27.e111567.

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Oligocene mysticetes display an unparalleled diversity and morphological disparity in the evolutionary history of Mysticeti. However, their paleoecological aspects, such as the patterns of coexistence of different morphotypes, remain poorly explored. Here we describe an aetiocetid (toothed mysticete) from the Jinnobaru Formation (lower upper Oligocene, about 28 million years ago) of Umashima Island, Kitakyushu, Japan. Our description of a toothed mysticete from the Oligocene of Umashima exemplifies the coexistence of toothed and baleen-assisted mysticetes in the northwestern Pacific. Hopefully, new finds of Oligocene mysticetes will lead to a well-sampled dataset for analyzing this and other related paleoecological traits to understand the demise of “archaic” Oligocene mysticetes and the subsequent rise of the modern-looking baleen-bearing whales in Miocene times.
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Augé, Marc, and Daniel Pouit. "Presence of iguanid lizards in the European Oligocene Lazarus taxa and fossil abundance." Bulletin de la Société Géologique de France 183, no. 6 (December 1, 2012): 653–60. http://dx.doi.org/10.2113/gssgfbull.183.6.653.

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Abstract During the Eocene, iguanid lizards were a diverse and widespread group in Europe. Prior to this study, no iguanid was known in Europe after the Eocene-Oligocene boundary. Some specimens from the locality of Pech-du-Fraysse (late Oligocene, MP28, France, Phosphorites du Quercy) are described. They belong to the Iguanidae, more precisely to the genus Geiseltaliellus, demonstrating that iguanid lizards survived the Eocene-Oligocene extinctions in Europe, only to disappear in the aftermath, certainly during the latest Oligocene. Thus, Geiseltaliellus is recognized as a Lazarus taxa. Explanations pertaining to the Lazarus effect are examined.
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Dissertations / Theses on the topic "Oligocene"

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Rivero, Cuesta Lucía. "Response of Phytoplankton to Climatic Changes during the Eocene-Oligocene Transition at the North Atlantic ODP Site 612." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-256769.

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The development of modern glacial climates occurred during the Eocene-Oligocene transition (34 to 35.5 Ma) when a decrease of atmospheric CO2 led to a global temperature fall. The ocean was deeply affected, both in the surface and the deep-sea, suffering a strong reorganization including currents and phytoplankton distribution. Spanning that time, 35 samples from the North Atlantic Ocean Drilling Program Site 612 have been analyzed by counting coccoliths abundance in different size groups (< 4 µm, 4 to 8 µm and > 8 µm) and silica fragments abundance. Absolute coccoliths abundance were estimated with two different methods, the “drop” technique and microbeads calibration. In addition, a fragmentation index was calculated to assess the preservational state of the samples. The results obtained fit in the global picture of a decrease in phytoplankton abundance across theEocene-Oligocene boundary, although coccolith and silica fragments abundances show slight different patterns. Absolute abundances estimates showed a large difference between the “drop” and the microbeads methods. The temperature at which samples are dried seems to affect microbeads distribution, leading to an underestimation at temperatures higher than 60º C. In future work the current dataset will be updated with additional calibration and replicate counts to confirm that the “drop” estimates are the more valid results. As the fragmentation index was fairly constant in all samples, no major differences in nannofossil preservation were inferred. Coccoliths abundance drops are thought to be triggered by global temperature fall, general decrease of atmospheric CO2, changes in oceanic circulation, pulses of nutrients or a combination of those.
Under tidsspannet som täcker övergången mellan eocen och oligocen, för ungefär 35.5 till 34 miljoner år sedan, genomgick jordens klimat en stor förändring. Under eocen hade vår planet ett varmare klimat och var i ett så kallat ”greenhouse state”. Mot slutet av denna period och i början av oligocen skiftade emellertid klimatet till en kallare regim, ett så kallat ”icehouse state”. Under detta tillstånd minskade andelen koldioxid i atmosfären vilket medförde att den globala temperaturen minskade. Vidare påverkades också havet och speciellt de fytoplankton som levde där, då de påverkas av temperatur och inflödet av näringsämnen. Fytoplankton står för en betydande del av jordens pågående fotosyntes samt är basen av den organiska matkedjan. Syftet med denna undersökning är att studera förekomsten av coccoliter, små kalcitplattor som produceras av en typ av nannoplankton som kallas coccolitoforider. Coccoliter från en djuphavskärna härstammande från norra Atlanten har därför samlats in och för-ändringen av mängden fytoplankton över nämnda tidsspann mätts. Vidare har också bitar av kisel från andra växtplankton räknats. Resultatet av denna studie var att båda grupperna var rikligare under den sista delen av eocen men mängden sjönk snabbt i början av oligocen. Det finns inte tillräckligt med information för att reda ut orsakerna av detta, men det är troligt att minskningen i temperatur och CO2-tillgängligheten för fotosyntesen är viktiga faktorer.
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Sahy, Claudia Diana. "Geochronology and chronostratigraphy of the Eocene-Oligocene transition." Thesis, University of Leicester, 2014. http://hdl.handle.net/2381/28952.

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This thesis integrates high-precision (<0.2%, 2σ) [superscript 206]Pb/[superscript 238]U dating of zircons from volcanic tuffs intercalated in key Late Eocene-Oligocene marine and terrestrial sedimentary successions, with high-resolution biostratigraphic and magnetostratigraphic data sets in order to critically examine the accuracy and precision of the numerical age calibration of the Eocene – Oligocene transition (EOT). Weighted mean [superscript 206]Pb/[superscript 238]U ages from the Italian Umbria-Marche and North American White River Group (WRG) sedimentary successions are 0.4-1.0 Myr younger than legacy [superscript 40]Ar/[superscript 39]Ar biotite and sanidine data from the same tuffs (calibrated relative to Fish Canyon sanidine at 28.201 Ma). [superscript 206]Pb/[superscript 238]U calibrated age-depth models were used to constrain the age of magnetic reversals between 26.5-36 Ma (C8r-C16n.2n). Interpolated magnetic reversal ages are consistent with relatively constant seafloor spreading rates, and provide a fully integrated and robust chronostratigraphic framework for the EOT, as shown by mutual consistency of chron boundary ages from the Umbria-Marche basin and the WRG between 31-36 Ma. These data effectively eliminate the discrepancies between astronomically tuned and radio-isotopically calibrated time scales of the EOT. An evaluation of the fidelity of planktonic foraminifer bioevent based chronostratigraphy across the EOT indicates that the last occurrence of hantkeninids and the last common occurrence of Chiloguembelina cubensis which mark the Eocene-Oligocene (34.090 ± 0.074 Ma) and Rupelian – Chattian (28.126 ± 0.175 Ma) boundaries are not timetransgressive across oceanic basins. However, other Oligocene planktonic foraminifer bioevents occur 0.4-0.8 Myr later in the western Tethys than in tropical and subtropical open ocean settings. In the WRG sedimentary succession, the first and last appearance datums of key Late Eocene mammal taxa show diachroneity of ca. 1 Myr over a distance of 400 km. Long-term aridification recorded by the WRG appears to be time-transgressive, and progressed gradually from west to east, while abrupt Early Oligocene cooling reported from WRG outcrops in NE Nebraska was synchronous with Early Oligocene glaciation of Antarctica.
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Peleo-Alampay, Alyssa M. "Miocene and oligocene calcareous nannofossils : biochronology and paleoceanography /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9823695.

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Julian, Meaghan Elizabeth. "Benthic foraminiferal faunal changes during the Eocene/Oligocene climate transition at Ocean Drilling Program (ODP) sites 1209A and 1211A from the Shatsky Rise, central Pacific Ocean." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1519.

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Broadbent, Tom. "Low latitude pacific palaeoceanographic change across the Eocene/Oligocene boundary." Thesis, Bangor University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529758.

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May, Geoffrey. "Oligocene to recent evolution of the Calama Basin, northern Chile." Thesis, University of Aberdeen, 1997. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=191900.

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The Calama and eastern Pampa del Tamarugal Basins are located between 22°S and 23°S within the forearc of northern Chile. They are filled by sediments deposited in alluvial braidplain, fluvial, playa sandflat, lacustrine and volcaniclastic environments under a semi-arid to hyper-arid climate. The nature of the alluvial braidplain depositional environment is unusual in that it combines elements of both alluvial fan and fluvial depositional systems, in contradiction to recently published models of alluvial fan sedimentation. Detailed sedimentary logging, magnetostratigraphy and dating of 14 volcanic interbeds by the 40Ar/39Ar laser fusion method has established a lithostratigraphic and chronostratigraphic framework for the 700 m thick basin-fill. Basin formation was investigated by regional subsidence during the Late Eocene or Early Oligocene, followed by widespread alluvial braidplain deposition during the Oligocene(?). A change to fluvial and playa sandflat deposition during the Early to Mid-Miocene is considered to be coincident with a decrease in active subsidence. Sedimentation ceased and thick (25 m) gypcrete deposits developed along the eastern margin of the basin during the Mid-Miocene as a response to an increasingly arid climate. Phases of minor lacustrine, fluvial and alluvial braidplain deposition during the Late Miocene-Early-Pliocene and the Late Pliocene(?) to Pleistocene were primarily controlled by small-scale fault movements and folding events, although climatic variations may have been important in some cases. A new lithostratigraphic division of the basin-fill is proposed here, which comprises 13 different formations. The previously defined El Loa Formation comprises a number of depositional units which are spatially and temporally discrete formations, and is therefore awarded group status.
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Smith, Richard Edward. "The Oligocene-Miocene Transition : new insights from the Newfoundland Margin." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/421152/.

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As a major site of deep water formation, the North Atlantic plays a critical role in global climate. To understand better how Earth’s climate system works it should therefore be a priority for geologists to study the record of past climate change encoded in the sedimentary archives that accumulate in the deep Atlantic. Here, sediment drilled in several cores on the Newfoundland Margin by International Ocean Discovery Program (IODP) Expedition 342 is utilized to provide fresh insights into palaeoclimate history, focusing on one of the more enigmatic events of the Cenozoic: the Oligocene-Miocene Transition (OMT), 23 million years ago. This is a time interval that Expedition 342 sediments have recorded in an continuous and expanded fashion unparalleled in previous records. This thesis aims to shed new light on North Atlantic OMT climate variability on both orbital and millennial-centennial timescales, and to increase the fidelity of foraminiferal proxies in this time interval. In Chapter 3, late Oligocene climate is shown to change cyclically on sub-orbital timescales. Centennial-millennial timescale variability is a key feature of Plio- Pleistocene climate; the record presented here is the first such record from earlier in the Cenozoic. These results show that Atlantic meridional overturning circulation is variable on sub-orbital timescales over a wider range of climate states than previously recognized. In Chapter 4, orbital- resolution planktic stable isotope records spanning the OMT are presented. These results – the first orbital-timescale record of sea surface conditions over the OMT – reveal that temperature changes in North Atlantic surface waters precede Antarctic glaciation/deglaciation and bottom water cooling/warming by tens of kyrs. In Chapter 5, the excellent preservation quality of foraminifera recovered by IODP Expedition 342 is exploited in a rigorous assessment of the taxonomy of several planktic foraminiferal species often used to generate palaeoclimate records over the OMT, with a focus on Globigerina bulloides. This quantitative, statistical approach enables non- subjective delineation of morphological variability into morphospecies, and highlights subtle morphological features that are critical to distinguish when picking foraminifera for stable isotope analyses. Together, the results of this thesis reveal that Earth’s climate system in the late Oligocene to early Miocene was much more dynamic and complex than previously recognized.
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Fitzgerald, John Andrew. "Pollen and spore assemblages from the Oligocene Lough Neagh Group." Thesis, University of Sheffield, 1999. http://etheses.whiterose.ac.uk/10365/.

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This study was initiated to solve a stratigraphic problem for the Geological Survey of Northern Ireland prior to the revision in 1997 of the 1:250000 map of the solid geology of Northern Ireland. An exploratory drilling programme carried out by the Survey in 1983/1984 revealed the existence of previously unknown Tertiary sediments north west of the Tow Valley Fault. The boreholes revealed a sequence of clays and lignites that were attributed to the Lough Neagh Group. These lay above an interbedded sequence of litho marge, pyroclastics and lacustrine deposits termed the Dunaghy Formation. The Geological Survey required an age to be assigned to this formation and it was proposed that the use of the preserved pollen and spore assemblages offered the best means for dating the sequence. In order to achieve this four boreholes were analysed. Boreholes 13/611, 13/603, 36/4680 and 27/415 contain the Lough Neagh Group. In addition 13/611 and 13/603 contain the Dunaghy Formation. From the pollen and spore assemblages recovered an Oligocene age IS confirmed for the Lough Neagh Group and proposed for the Dunaghy Formation. This information led to the attribution of an Oligocene age to the Dunaghy Formation in the 1997 revised 1:250000 Geological Map of Northern Ireland. The palaeovegetation deduced from the recovered pollen and spore assemblages is in accordance with an Oligocene cooling. The climax angiosperm vegetation, predominantly consisting of temperate forms with some megatherm taxa, grew in a raised bog forest ecosystem within a fluvial-lacustrine environment. All pollen and spore taxa recovered are described including new forms identified. A correlation of the four sections is proposed.
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Champagne, Tracy Ann Neil. "Oligocene coral evolution in Puerto Rico and Antigua: morphometric analysis of Agathiphyllia, Antiguastrea, and Montastraea." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/1128.

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The University of Iowa Paleontology Repository maintains an extensive collection of Caribbean coral specimens. This study includes 285 specimens, of which approximately 75 are thin-sections of three previously identified Oligocene genera including: Montastraea Blainville, 1830 (=Orbicella Dana 1846), Antiguastrea Vaughan, 1919, and Agathiphyllia Reuss, 1864 (=Cyathomorpha Reuss, 1868). This study includes: photography of colony surfaces and thin-sections of representative specimens of each species, and the identification of the three Oligocene genera Montastraea, Antiguastrea, and Agathiphyllia to the species level. This study compared the collections with the agathiphyllid stratigraphic ranges in the Paleobiology Database, curated these specimens, and then entered the information into the database, SpecifyTM. These continued efforts aid in better understanding diagnostic morphologic characters of three genera: Antiguastrea, Agathiphyllia, and Montastraea. Two of the genera, Antiguastrea and Agathiphyllia, are extinct. Because the differences in morphology are subtle and not very well understood, previous biodiversity studies using the colony surface for correct species identification have been difficult and often inaccurate. Montastraea is further complicated by recent research that suggests it is polyphyletic and contains multiple species complexes, based on the combined use and creation of more morphological characters and on molecular phylogenetics. Additionally, this study assists with the understanding of the biodiversity of these Oligocene coral genera in the Caribbean region prior to the Plio-Pleistocene extinction event, and the evolutionary history of coral diversity in this region. Though there was an extinction event across the Caribbean, the locality species richness, using Fisher's α and Shannon's H, showed no significant differences between the Late Oligocene formations and the Early Miocene formations.
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Moss, Graham. "The Port Willunga Formation : Eocene/Oligocene boundary stratigraphy and foraminiferal turnover /." Adelaide, 1989. http://web4.library.adelaide.edu.au/theses/09SB/09sbm913.pdf.

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Books on the topic "Oligocene"

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Lambe, Lawrence M. The vertebrata of the Oligocene of the Cypress Hills, Saskatchewan. Ottawa: Govt. Print. Bureau, 1997.

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Oligocene Echinoids of North Carolina. Washington, D.C: Smithsonian Institution Press, 1997.

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Laagland, H. Cycloclypeus in the Mediterranean Oligocene. Utrecht, Netherlands: U.M.B., 1990.

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

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R, Prothero Donald, and Berggren William A, eds. Eocene-Oligocene climatic and biotic evolution. Princeton, N.J: Princeton University Press, 1992.

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Axelrod, Daniel I. The late Oligocene Creede flora, Colorado. Berkeley: University of California Press, 1987.

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Kacharava, M. V. Geologicheskie sobytii͡a︡ na granit͡s︡e ėot͡s︡ena i oligot͡s︡ena Gruzii. Tbilisi: "Met͡n︡iereba", 1991.

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Piller, Werner E., Fritz F. Steininger, and Fred Rögl. Oligocene/Miocene transitions in the eastern Mediterranean. Stuttgart: Schweizerbart'sche Verlagsbuchhandlung, 2004.

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Ivan, Cicha, and Regional Committee on Mediterranean Neogene Stratigraphy. Working Group on the Foraminifera of the Central Paratethys., eds. Oligocene-Miocene foraminifera of the Central Paratethys. Frankfurt am Main: W. Kramer, 1998.

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1957-, Bestland Erick A., and Fremd Theodore J. 1952-, eds. Eocene and Oligocene paleosols of central Oregon. Boulder, Colo: Geological Society of America, 1999.

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Book chapters on the topic "Oligocene"

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Shaltami, Osama Rahil, Fares F. Fares, Hwedi Errishi, and Farag M. EL Oshebi. "Oligocene Deposits." In Isotope Geochronology of the Exposed Rocks in the Cyrenaica Basin, NE Libya, 41–59. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-63010-2_4.

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Rull, Valentí. "Oligocene Revolution." In Ecological Studies, 85–124. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-57612-6_4.

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Corliss, Bruce H., and Lloyd D. Keigwin. "Eocene-Oligocene paleoceanography." In Mesozoic and Cenozoic Oceans, 101–18. Washington, D. C.: American Geophysical Union, 1986. http://dx.doi.org/10.1029/gd015p0101.

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Sinha, Patrali, and Kalyan Halder. "The Oligocene Corals Had Circumtropical Distribution." In Society of Earth Scientists Series, 293–308. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-77443-5_12.

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Brandano, Marco. "Oligocene Rhodolith Beds in the Central Mediterranean Area." In Rhodolith/Maërl Beds: A Global Perspective, 195–219. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29315-8_8.

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"Oligocene." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 930. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_150320.

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"Oligocene." In Encyclopedic Dictionary of Archaeology, 967. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58292-0_150109.

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"Oligocene clay." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 930. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_150321.

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"Oligocene marl." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 930. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_150322.

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"Oligocene Epoch." In Encyclopedic Dictionary of Archaeology, 967. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58292-0_150110.

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Conference papers on the topic "Oligocene"

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Widrig, Klara E., and Nicholas A. Famoso. "NICHE PARTITIONING IN AN OLIGOCENE CARNIVORE GUILD." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-306622.

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Paulk, Mallory, Tamie J. Jovanelly, and Jose Santamaria. "UPDATING THE GEORGIA FOSSIL RECORD (CAMBRIAN THROUGH OLIGOCENE)." In 66th Annual GSA Southeastern Section Meeting - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017se-291095.

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Hou, Dongmei, Chao Li, Pengyu Gao, Xun Yuan, Xiaolong Zhang, and Zhong Cheng. "Sedimentary Evolution of Delta and Reservoir Distribution Under the Control of a Volcanic System." In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/215985-ms.

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Abstract The BZ34-9 oilfield is a clastic reservoir discovered in the Oligocene strata in the southern part of the Bohai Bay Basin. The volcanic system here is intermixed with a clastic reservoir that spans more than 1000 meters. In its upper part, it overlies about 2000 meters of Miocene strata. Volcanic activity has influenced the deposition and filling of the lacustrine and played a key role in controlling the distribution of clastic reservoirs. Based on 3D seismic data and lithological data from 74 wells, four types of volcanic were identified and extracted according to seismic sequences. Establish and clearly state the reciprocal relationship between volcanism and sedimentation. The study of volcanic stratigraphic framework reflects the environmental change of volcanoes from terrestrial to marine, which is consistent with the understanding of the sedimentary environment from paleontological and sedimentary facies studies. Small-scale volcanism predates the formation of the early Oligocene strata, and a regional eruption center to the south and east of the BZ34-9 oilfield provides the tectonic setting for the basin evolution. The early Oligocene strata was deposited in a shallow lake environment, thin-bed distributary channels are developed in the near-source facies belt near the central volcano, and thick-bed mouth dams are developed in the far-source facies belt. Volcanoes of this period influenced the distribution of clastic reservoirs by the effusion facies and intrusive facies near conical craters. Water depth becomes deeper when the late Oligocene strata are deposited, thick-bed continuous underwater distributary channels and an estuary dam is developed in the sedimentary area. Volcanic activity was moderate until the last major eruption. During this period, the hydrothermal vent in the far-source facies belt is the main factor affecting the distribution of clastic reservoirs. It is of great significance for the further fine description of reservoirs and regional exploration.
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Beasley, Charlotte, Kate Littler, Sev Kender, Liviu Giosan, Pallavi Anand, Katrina Nilsson-Kerr, and Melanie J. Leng. "The Oligocene–Miocene Transition in the Tropical Low Latitudes." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.151.

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Perez, Victor J. "CHONDRICHTHYAN DIVERSITY ACROSS THE EOCENE-OLIGOCENE TRANSITION OF FLORIDA." In 68th Annual GSA Southeastern Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019se-327165.

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Burton, Zachary F. M., Tim McHargue, and Stephan A. Graham. "GLOBAL EOCENE-OLIGOCENE BOUNDARY UNCONFORMITY IN CLASTIC SEDIMENTARY BASINS." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-350910.

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Hou, Mingqiu, Guangsheng Zhuang, Minghao Wu, Brooks B. Ellwood, and Xiaolei Liu. "EOCENE-OLIGOCENE CLIMATE TRANSITION IN THE SUBTROPIC NORTH AMERICA." In 54th Annual GSA South-Central Section Meeting 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020sc-343077.

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Lebel, Caitlin P., and Laura J. Cotton. "LARGER BENTHIC FORAMINIFERA OF THE EOCENE-OLIGOCENE OF FLORIDA." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-340192.

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Muchlis, M., and C. Elders. "OLIGOCENE TO RECENT STRUCTURAL EVOLUTION OF NORTH SUMATRA BASIN." In APGCE 2019. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201903422.

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Lucas, Spencer G. "Oligocene mammals from the Black Range, southwestern New Mexico." In 37th Annual Fall Field Conference. New Mexico Geological Society, 1986. http://dx.doi.org/10.56577/ffc-37.261.

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Reports on the topic "Oligocene"

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Scarberry, Kaleb C. Geologic map of the Hubbart Reservoir 7.5' quadrangle, Flathead and Sanders Counties, Montana. Montana Bureau of Mines and Geology, July 2023. http://dx.doi.org/10.59691/dkuv6756.

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Miller, P. E., and J. S. Bell. Paleogeography, IV, Labrador sea, Late Eocene and early Oligocene Paleoenvironments. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127195.

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Bozukov, Vladimir, and Dimiter Ivanov. New Palaeobotanical Data for the Late Oligocene Pernik Coal Basin ( W Bulgaria ) - Preliminary Results. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, November 2020. http://dx.doi.org/10.7546/crabs.2020.11.11.

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Long, D. G. F., and P. S. W. Graham. Sedimentology and coal resources of the Early Oligocene Australian Creek Formation, near Quesnel, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/183995.

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Schröder-Adams, C. J., and D. H. McNeil. Oligocene to Miocene agglutinated foraminifers in deltaic and deep-water facies of the Beaufort-Mackenzie Basin. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/195162.

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Rich, Megan, Charles Beightol, Christy Visaggi, Justin Tweet, and Vincent Santucci. Vicksburg National Military Park: Paleontological resource inventory (sensitive version). National Park Service, March 2023. http://dx.doi.org/10.36967/2297321.

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Vicksburg National Military Park (VICK) was established for its historical significance as a one of the principle military sieges resulting in a turning point during the American Civil War. The steep terrain around the city of Vicksburg was integral in the military siege, providing high vantage points and a substrate that was easy to entrench for the armies, but unknown to many is the fossil content, particularly a diversity of fossil mollusks. These fossils at VICK are important paleontological resources which have yet to receive focused attention from park staff, visitors, and researchers. The park’s geology is dominated by windblown silt from the last Ice Age which overlays river-transported gravels and bedrock of the late Oligocene–early Miocene-age Catahoula Formation or early Oligocene Vicksburg Group. The park is home to the type section (a geological reference locality upon which a formation is based) for the Mint Spring Formation, one of the most fossiliferous formations in this group (Henderson et al. 2022). Beginning roughly 32 million years ago (Dockery 2019), the early Oligocene deposits of the Vicksburg Group were deposited as the sea level along the Gulf Coast shore repeatedly rose and fell. The eponymously named Vicksburg Group is comprised of, from oldest to youngest, the Forest Hill, Mint Spring, Marianna Limestone, Glendon Limestone, Byram, and Bucatunna Formations. Each of these formations are within VICK’s boundaries, in addition to outcrops of the younger Catahoula Formation. Paleozoic fossils transported by the ancestral Mississippi River have also been redeposited within VICK as pre-loess stream gravels. Overlying these layers is the Quaternary-age silt which composes the loess found throughout VICK, meaning the park’s fossils span the entire Phanerozoic Eon. The fossils of VICK consist mostly of near-shore marine Oligocene invertebrates including corals, bryozoans, bivalves, gastropods, scaphopods, ostracods, and more, though terrestrial and freshwater snails of the loess, microfossils, plant fossils, occasional vertebrates, and others can also be found in the park. Notable historical figures such as Charles Alexandre Lesueur, Charles Lyell, and John Wesley Powell all collected fossils or studied geology in the Vicksburg area. The Vicksburg Group is culturally relevant as well, as the Glendon Limestone Formation has been identified by its embedded fossils as a source rock for Native American effigy pipes. This paleontological resource inventory is the first of its kind for VICK. Although Vicksburg fossils have most recently been studied as part of the Gulf Coast Inventory & Monitoring Network (Kenworthy et al. 2007), the park has never received a comprehensive, dedicated fossil inventory before this report. At least 27 fossil species, listed in Appendix B, have been named and described from specimens collected from within VICK’s lands, and VICK fossils can be found at six or more non-NPS museum repositories. Beginning in January 2022, field surveys were undertaken at VICK, covering nearly all the park’s wooded areas, streams, and other portions beyond the preserved trenches and tour road. Fossils were collected or observed at 72 localities. These specimens will be added into VICK’s museum collections, which previously contained no paleontological resources. Considering the minimal attention dedicated to these resources in the past, these newly acquired fossil specimens may be used in the future for educational, interpretive, or research purposes. Future park construction needs should take into account the protection of these resources by avoiding important localities or allowing collection efforts before localities become inaccessible or lost.
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LePain, D. L., R. B. Blodgett, and J. G. Clough. Sedimentology and hydrocarbon source rock potential of Miocene-Oligocene strata, McGrath Quadrangle: An outcrop analog for the Holitna Basin. Alaska Division of Geological & Geophysical Surveys, February 2003. http://dx.doi.org/10.14509/2870.

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Schroder-Adams, C. J., and D. H. McNeil. Biostratigraphic Distribution of Agglutinated Foraminifera in Oligocene and Miocene Shallow To Deep Water Facies of the Beaufort-Mackenzie Basin. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/128195.

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Marchev, Peter, Raya Raicheva, Rositsa Ivanova, Irena Peytcheva, and Valentin Grozdev. Early Oligocene Supereruption in SE Europe Outlined by 33.3 Ma U‒Pb Ages for Lemnos Tuff and Correlation with Regional Ash Deposits. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, March 2021. http://dx.doi.org/10.7546/crabs.2021.03.11.

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Chi, G. Q., J. R. Dietrich, Z. Chen, and J. Dixon. Oligocene Kugmallit sequence in the Beaufort-Mackenzie Basin of Arctic Canada: Regional sequence stratigraphic framework, potential controls on sedimentation cycles and reservoir patterns. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2009. http://dx.doi.org/10.4095/248234.

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