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Academic literature on the topic 'Paleontology – Paleogene'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Paleontology – Paleogene"

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Herrera, Claudia, Graciela Esteban, Daniel Alfredo Garcia-Lopez, Virginia Deraco, Judith Babot, Cecilia del Papa, Sara Bertelli, and Norberto Giannini. "New Cingulata (Mammalia, Xenarthra) from the Upper Lumbrera Formation (Bartonian, middle Eocene), Salta Province, Argentina." Revista Brasileira de Paleontologia 24, no. 3 (September 26, 2021): 236–44. http://dx.doi.org/10.4072/rbp.2021.3.05.

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We describe isolated remains of a Paleogene cingulate from El Simbolar locality, Upper Lumbrera Formation (Bartonian), southern Salta Province, northwestern Argentina. The material consists of numerous fixed, movable, and caudal sheath osteoderms. The specimen has large-sized osteoderms, with a lageniform main figure, as in Utaetus buccatus, U. laxus, U. argos, ?U. deustus, Punatherium catamarcensis, and the basal euphractin Archaeutatus. The combination of morphological characters, in addition to its large size, allows us to recognize a new species of “Utaetini” for the Paleogene of northwestern Argentina. This new species of ?Utaetus represents the oldest record of Euphractinae in this region, and strengthens the endemic condition of its Paleogene faunas. Keywords: Cingulata, osteoderms, El Simbolar, Paleogene, Salta, Argentina.
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Reguant, Salvador. "Bryozoa and stratigraphy in Paleogene times through the study of Paleogene species from Europe." Spanish Journal of Palaeontology 10, no. 1 (August 9, 2022): 117. http://dx.doi.org/10.7203/sjp.24107.

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Menkveld-Gfellner, Ursula, and Danielle Decrouez. "The Paleogene of Masirah Island (Sultanate of Oman)." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 234, no. 1-3 (December 22, 2004): 311–33. http://dx.doi.org/10.1127/njgpa/234/2004/311.

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Gingerich, Philip D. "Paleogene vertebrates and their response to environmental change." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 234, no. 1-3 (December 22, 2004): 1–23. http://dx.doi.org/10.1127/njgpa/234/2004/1.

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Alegret, Laia, Ignacio Arenillas, José A. Arz, and Eustoquio Molina. "Foraminiferal event-stratigraphy across the Cretaceous/Paleogene boundary." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 234, no. 1-3 (December 22, 2004): 25–50. http://dx.doi.org/10.1127/njgpa/234/2004/25.

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Pearson, Paul N., Eleanor John, Bridget S. Wade, Simon D'haenens, and Caroline H. Lear. "Spine-like structures in Paleogene muricate planktonic foraminifera." Journal of Micropalaeontology 41, no. 2 (August 1, 2022): 107–27. http://dx.doi.org/10.5194/jm-41-107-2022.

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Abstract. Muricate planktonic foraminifera comprise an extinct clade that was diverse and abundant in the Paleogene oceans and are widely used in palaeoclimate research as geochemical proxy carriers for the upper oceans. Their characteristic wall texture has surface projections called “muricae” formed by upward deflection and mounding of successive layers of the test wall. The group is generally considered to have lacked “true spines”: that is, acicular calcite crystals embedded in and projecting from the test surface such as occur in many modern and some Paleogene groups. Here we present evidence from polished sections, surface wall scanning electron microscope images and test dissections, showing that radially orientated crystalline spine-like structures occur in the centre of muricae in various species of Acarinina and Morozovella and projected from the test wall in life. Their morphology and placement in the wall suggest that they evolved independently of true spines. Nevertheless, they may have served a similar range of functions as spines in modern species, including aiding buoyancy and predation and especially harbouring algal photosymbionts, the function for which we suggest they probably first evolved. Our observations strengthen the analogy between Paleogene mixed-layer-dwelling planktonic foraminifera and their modern spinose counterparts.
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Parsons, Marion Grace, and Geoffrey Norris. "Paleogene fungi from the Caribou Hills, Mackenzie Delta, northern Canada." Palaeontographica Abteilung B 250, no. 4-6 (August 6, 1999): 77–167. http://dx.doi.org/10.1127/palb/250/1999/77.

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Schweitzer, Carrie E., Matúš Hyžný, and Rodney M. Feldmann. "New Paleogene and Neogene decapod crustaceans (Axiidea, Brachyura) from Venezuela." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 300, no. 3 (June 28, 2021): 245–66. http://dx.doi.org/10.1127/njgpa/2021/0988.

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Melendi, Daniel L., Laura H. Scafati, and Wolfgang Volkheimer. "Palynostratigraphy of the Paleogene Huitrera Formation in N-W Patagonia, Argentina." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 228, no. 2 (May 28, 2003): 205–73. http://dx.doi.org/10.1127/njgpa/228/2003/205.

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Salahi, A., and A. Ghaderi. "Paleogene Molluscan Communities in the Kopet-Dagh Basin, NE Iran." Paleontological Journal 55, no. 10 (December 2021): 1141–57. http://dx.doi.org/10.1134/s0031030121100075.

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Dissertations / Theses on the topic "Paleontology – Paleogene"

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Ziga, Jeffrey Michael. "The Moroni formation in Salt Creek Canyon Central, Utah: implications for paleogene topography." Connect to resource, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1149600004.

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Levering, David A. "A morphospace oddity| Assessing morphological disparity of the Cimolodonta (Multituberculata) across the Cretaceous-Paleogene extinction boundary." Thesis, Oklahoma State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1547071.

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In this study, I focus on the loss of species diversity—and therefore morphological diversity—within the Cimolodonta (Multituberculata) during the Cretaceous-Paleogene (K-Pg) extinction, followed by their recovery in the Puercan (earliest Paleogene). Teeth make up the majority of the cimolodontan fossil record, allowing inferences of dietary ecology, body size estimates, and phylogenetic proximity. I analyzed morphological disparity within the restricted phylogenetic framework of the Cimolodonta. I addressed 3 questions: 1) Did the conditions of the K-Pg extinction select for or against cimolodontan dental morphologies, if it was selective at all? 2) Do levels of cimolodontan morphological similarity return to pre-extinction levels in the Puercan? 3) Do the Puercan Cimolodonta recover morphology lost during the extinction, or do the Cimolodonta morphologically diverge from the pre-extinction morphospace? I used Euclidian inter-taxon distance measures derived from dental character data to perform a principal coordinates analysis (PCO), generating a multidimensional representation of morphological similarity. To assess the selectivity versus non-selectivity of cimolodontan extinction across the K-Pg boundary, I analyzed the axes of the morphospace for morphological character gradients. I tested for extinction selectivity to determine the probability of generating the survivor-specie morphospace by chance. These results indicate significant (P = 0.0006) selection affecting cimolodontan survival across the K-Pg extinction. Overall morphospace occupation changed significantly (P < 0.015) in the Puercan as well. I attribute this change in morphospace occupation to the diversification of the Taeniolabididae and incomplete recovery of Late Cretaceous morphospace by the Puercan Cimolodonta. Vacancies in the Puercan cimolodontan morphospace may be a result of changes in available dietary resources, or competitive exclusion. The Taeniolabididae occupy a morphospace region distant from the remainder of the Puercan Cimolodonta, supporting independent studies suggesting they were an immigrant taxon rather than a product of rapid phenotypic divergence. My results indicate selection taking place over the K-Pg extinction for small body size within the Cimolodonta. I also find evidence of partial reoccupation of Late Cretaceous cimolodontan morphospace in the Puercan, indicating ecological niche recovery.

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Jarrett, Matthew Brett. "Lilliput Effect Dynamics across the Cretaceous-Paleogene Mass Extinction: Approaches, Prevalence, and Mechanisms." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6518.

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An organism's body size entails both physiological and ecological costs. Furthermore, as a parameter in analyzing organisms, it represents a fundamental and essential morphometric character. Reductions in size following mass extinction is a commonly observed phenomenon in the fossil record. This study examines the evolutionary significance of this phenomenon termed the: 'Lilliput Effect' by proposing that it represents a rapid evolutionary response to altered selection pressures during a mass extinction. This primary hypothesis is evaluated against two additional hypotheses of size reduction: 1) stunted growth as a response to stressed ecosystems, and/or 2) mass extinctions are size selective. These hypotheses were tested using data from shell size measurements and morphology primarily from molluscs and brachiopods from both North America and Denmark.. Morphological differences were evaluated using Elliptical Fourier Analysis (EFA) of outline shape in conjunction with Principle Components and Canonical Variate Analysis. The first part of this study provides a detailed methodology for data collection and analysis. New methods were developed which display promise in improving the degree to which differences and similarities in shape can be elucidated using EFA. These methods were then employed to test hypotheses of morphological change through minor events of local significance in the Florida Neogene and following the K/Pg mass extinction. Data sources for the K/Pg mass extinction were from high resolution (10 cm intervals) collection of bulk samples from the Brazos River in Texas as well as reposited museum specimens for the Braggs locality in Alabama and Danish samples. Study of size and evolution through more minor local events in the fossil record entailed measurements and shape analysis of left valves of bivalves from the genus Chine. Various environmental changes occurred at variousmpoints during the Neogene in Florida Neogene, most profoundly documented during the Plio-Pleistocene with accompanying faunal turnover. TheChione specimens analyzed were derived from a discontinuous sequence encompassing ~18 Ma and represent material from the Miocene Chipola Formation through to the Recent. The size of Chione increased from the Miocene to the Pliocene and then decreased from the Pliocene into the Pleistocene possibly due to lower primary productivity. The later part of the Pleistocene into the Recent was characterized by increased size relative to the early Pleistocene and size was stable through this interval. Morphologically, Chione changed in shape from the Miocene to the Pliocene, but remained in stasis from the Pliocene to the Recent suggesting that stabilizing selection may work well during periods of rapid, minor, environmental perturbations. There were a number of global changes occurring within the late Maastrichtian pr and the results of size measurements of molluscs demonstrate a decrease in size prior to the K/Pg mass extinction in Texas likely in response to a number of global scale events occurring towards the close of the Cretaceous that was also associated with morphological evolution in the small bivalve Breviarca webbervillensis. Paleocene material from Texas was dominated by smaller, newly evolved allochthonous grazing gastropods. These gastropods are thought to be newly evolved lineages as their first occurrence is marked in the Paleocene. Smaller sized nuculid bivalves were also a prominent feature in the Texas Paleocene and showed a rapid size beginning 40 cm above the boundary clay. At Braggs, Alabama, two groups, gastropods and oysters showed decreases in size across the boundary, and these changes are most likely a product of animpoverished Paleocene ecosystem. The pectinids were the only group of bivalve mollusc to xii reduce in size following extinction in Denmark most likely in response to a reduction in bryozoan substrate which resulted in a very soft coccolith-derived mud substrate in the mass extinction's aftermath. Size measurements from the Danish brachiopods showed reductions in size across the boundary in all genera except Rugia. There was a marked size reduction in specimens from the upper Maastrichtian at Stevns Klint as compared to the lower Maastrichtian at Mons Klint. The reasons for this are most likely due to lower temperatures at Stevns based on isotope data as well as lower productivity evidenced by lower δ13C values. There was a change in morphology for Terebratulina chrysalis in the earliest Paleogene due to shifted selective pressures favoring increased surface area as an adaptation to softer substrates. Size reduction within Danish sequences is evolutionary in nature as the Danian is characterized by different species within existing Maastrichtian genera and two new genera. The results of this study demonstrate that changes in body size can be a result of evolution from changing selective pressures as well as ecological perturbations. Distinguishing evolutionary forcings from ecological requires the collection and understanding of morphological data. Changes in size for Terebratulina chrysalis could have easily been interpreted as ecological were it not for morphological results showing the changes in surface area resulting from changing selective pressure. Late Cretaceous changes in climate and sea level produced observable changes in size and morphology in Breviarca webbervillensis. Potential size selectivity of the K/Pg mass extinction failed to account for any of the patterns observed in the data. Gryphaeid oysters in Denmark would have been a perfect candidate to support conclusions of size selectivity as they were the largest molluscs measured in this study and survived mass extinction.
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Weinstein, Deborah Lynn. "Phylogeny and Relationships of Taeniodonta, an Enigmatic Order of Eutherian Mammals (Paleogene, North America)." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1248301491.

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Eifert, Tambra L. "The Cretaceous-Paleogene transition in the northern Mississippi Embayment, S.E. Missouri: palynology, micropaleontology, and evidence of a mega-tsunami deposit." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Eifert_09007dcc80658622.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology, 2009.
Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 4, 2009) Includes bibliographical references (p. 243-265).
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Wiest, Logan A. "ICHNOLOGY OF THE MARINE K-PG INTERVAL: ENDOBENTHIC RESPONSE TO A LARGE-SCALE ENVIRONMENTAL DISTURBANCE." Master's thesis, Temple University Libraries, 2014. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/276312.

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Geology
M.S.
Most major Phanerozoic mass extinctions induced permanent or transient changes in ecological and anatomical characteristics of surviving benthic communities. Many infaunal marine organisms produced distinct suites of biogenic structures in a variety of depositional settings, thereby leaving an ichnological record preceding and following each extinction. This study documents a decrease in burrow size in Thalassinoides-dominated ichnoassemblages across the Cretaceous-Paleogene (K-Pg) boundary in shallow-marine sections along the Atlantic Coastal Plain (Walnridge Farm, Rancocas Creek, and Inversand Quarry, New Jersey) and the Gulf Coastal Plain (Braggs, Alabama and Brazos River and Cottonmouth Creek, Texas). At New Jersey sites, within a regionally extensive ichnoassemblage, Thalassinoides ichnospecies (isp.) burrow diameters (DTh) decrease abruptly by 26-29% (mean K=15.2 mm, mean Pg=11.2 mm; n=1767) at the base of the Main Fossiliferous Layer (MFL) or laterally equivalent horizons. The MFL has been previously interpreted as the K-Pg boundary based on last occurrence of Cretaceous marine reptiles, birds, and ammonites, as well as iridium anomalies and associated shocked quartz. Across the same event boundary at Braggs, Alabama, DTh of simple maze Thalassinoides structures from recurring depositional facies decrease sharply by 22% (mean K=13.1 mm, mean Pg=10.2 mm; n=26). Similarly, at the Cottonmouth Creek site, Texas, Thalassinoides isp. occurring above the previously reported negative £_13C shift and the first occurrence of Danian planktonic foraminifera are 17% smaller in diameter (mean K=21.5 mm, mean Pg=17.9 mm; n=53) than those excavated and filled prior to deposition of a cross-bedded, ejecta-bearing sandstone complex commonly interpreted as the Chicxulub ¡¥event deposit¡¦. At both of these impact-proximal regions, the Cretaceous and Paleogene burrows were preserved in similar lithologies, suggesting that a reduction in size cannot be attributed to sedimentological factors. At all localities, up-section trends in DTh are statistically significant (fÑfnf¬0.05; non-parametric Kruskal-Wallis test). Using the burrow diameter as a proxy for tracemaker body size, a reduction in DTh above the K-Pg boundary likely reflects dwarfing within the post-extinction community of decapod crustaceans. Dwarfing during the early recovery stages of the end-Cretaceous mass extinction, as recorded by ichnofossils, occurred within glauconite-producing (New Jersey), carbonate (Alabama), and siliciclastic (Texas) depositional environments and appears to be widespread. Because this ichnological signal appears to be a general phenomenon across the crisis interval, trace-fossil analysis provides a potential in-situ field method for constraining and correlating the stratigraphic position of the K-Pg and other extinction events, particularly in the absence of other macroscopic, microscopic, and geochemical indicators. Whereas overprinting of the original marine ichnofabric by morphologically similar continental traces is not a concern in lithified sections of Alabama and Texas, such an occurrence must be considered within unconsolidated sections. Within the Hornerstown Formation of New Jersey, a pervasive Thalassinoides framework contains traces of burrowing bees and wasps. Due to their penetration of up to 1 m, excavations just beyond the weathering front are insufficient for exposing the original marine ichnofabric. Insect burrow diameters (7-25 mm) are within the range of Thalassinoides traces (4-31 mm), exhibit occasional branching, and lack of ornamentation (bioglyphs) on the burrow walls. Therefore neither size nor gross morphology are adequate for distinguishing these widely diachronous and unrelated ichnites, especially when the insect burrows have been filled. However, the presence of backfill menisci and a beige clay halo help distinguish the ancient marine burrows, whereas highly oxidized fill and the occurrence of a terminal brooding chamber are diagnostic of modern insect burrows.
Temple University--Theses
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Génot, Patrick. "Les chlorophycees calcaires du paleogene d'europe nord-occidentale (bassin de paris, bretagne, cotentin, bassin de mons)." Nantes, 1987. http://www.theses.fr/1987NANT2060.

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L'etude de nombreuses chlorophycees (dasycladales, caulerpales) recoltees dans les sediments paleogenes du bassin de paris, de bretagne, du cotentin et du bassin de mons, nous a permis de reveler la morphologie externe et interne d'environ 70 especes dano-montiennes a stampiennes. Pour chaque espece, on precise les distributions stratigraphiques et paleogeographiques. Six nouvelles especes sont decrites
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McClure, Kate J. "Phylogenetic relationships and morphological changes in Venericardia on the Gulf Coastal Plain during the Paleogene /." 2009. http://hdl.handle.net/10288/1219.

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Maga, Ali Murat 1973. "Systematic paleontological investigation of the metatherian fauna from the Paleogene Uzunçarşıdere Formation, central Turkey." 2008. http://hdl.handle.net/2152/11660.

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The name Metatheria refers to the clade that contains the extant marsupials and also all extinct mammals that are more closely related to extant marsupials than to the placental mammals. Metatherians first appear in the fossil record of Asia during the Early Cretaceous, with younger records in North America (Late Cretaceous), South America (the latest Cretaceous or earliest Paleocene), and finally Australia via Antarctica (by the Eocene). The Cenozoic fossil record of metatherians in the Old World is rather poor. Except for Europe, there are only a handful of metatherian taxa known from Afro-Arabia and Asia, almost all of which are documented only by isolated teeth or partial jaws. Fieldwork at Uzunçarşı, a fossil site in central Turkey, yielded at least three different metatherian taxa, one of which (Anatoliadelphys) is exceptionally preserved and nearly complete. In this study I demonstrate that Anatoliadelphys occupies a more derived position on the metatherian tree than the well-known South American metatherians such as Pucadelphys. My functional morphological investigations indicate that Anatoliadelphys and the South American taxa Pucadelphys and Mayulestes are different from the extant didelphid marsupials of South America in their skeletal adaptations for locomotion. Anatoliadelphys was most likely terrestrial.
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"The Dietary Competitive Environment of the Origination and Early Diversification of Euprimates in North America." Doctoral diss., 2014. http://hdl.handle.net/2286/R.I.25151.

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abstract: The earliest Eocene marked the appearance of the first North American euprimates (adapids, omomyids). Despite the fact that leading hypotheses assert that traits involved in food acquisition underlie euprimate origination and early diversification, the precise role that dietary competition played in establishing euprimates as successful members of mammalian communities is unclear. This is because the degree of niche overlap between euprimates and all likely mammalian dietary competitors ("the euprimate competitive guild") is unknown. This research determined which of three major competition hypotheses - non-competition, strong competition, and weak competition - characterized the late Paleocene-early Eocene euprimate competitive guild. Each of these hypotheses is defined by a unique temporal pattern of niche overlap between euprimates and their non-euprimate competitors, allowing an evaluation of the nature of dietary competitive interactions surrounding the earliest euprimates in North America. Dietary niches were reconstructed for taxa within the fossil euprimate competitive guild using molar morphological measures determined to discriminate dietary regimes in two extant mammalian guilds. The degree of dietary niche separation among taxa was then evaluated across a series of fossil samples from the Bighorn Basin, Wyoming just prior to, during, and after euprimate origination. Statistical overlap between each pair of euprimate and non-euprimate dietary niches was determined using modified multivariate pairwise comparisons using distances in a multidimensional principal component "niche" space. Results indicate that euprimate origination and diversification in North America was generally characterized by the absence of dietary competition. This lack of competition with non-euprimates is consistent with an increase in the abundance and diversity of euprimates during the early Eocene, signifying that the "success" of euprimates may not be the result of direct biotic interactions between euprimates and other mammals. An examination of the euprimate dietary niche itself determined that adapids and omomyids occupied distinct niches and did not engage in dietary competition during the early Eocene. Furthermore, changes in euprimate dietary niche size over time parallel major climatic shifts. Reconstructing how both biotic and abiotic mechanisms affected Eocene euprimates has the potential to enhance our understanding of these influences on modern primate communities.
Dissertation/Thesis
Ph.D. Anthropology 2014
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Books on the topic "Paleontology – Paleogene"

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Paleogene fossil birds. Berlin: Springer, 2009.

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McDougall, Kristin A. Paleogene benthic foraminifers from the Loma Prieta quadrangle, California. [Menlo Park, CA]: U.S. Geological Survey, 1989.

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Russell, Donald E. The Paleogene of Asia: Mammals and stratigraphy. Paris: Editions du Muséum national d'histoire naturelle, 1987.

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Ujetz, Bernhardt. Micropaleontology of paleogene deep water sediments, Haute-Savoie, France. Genève: Université de Genève, 1996.

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Bhandari, Anil. Atlas of Paleogene ostracodes of Rajasthan basins. Dehradun: Geoscience Res. Group, K.D. Malaviya Inst. of Petroleum Exploration, Oil and Natural Gas Corp., 1996.

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Richard, Chandler. Cretaceous and Paleogene fossils of North Carolina: A field guide. Durham, NC (P.O. Box 2777, Durham 27705): North Carolina Fossil Club, 1995.

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RCNPS/RCNNS Meeting (1999 Leuven, Belgium). Contributions to the paleogene and neogene stratigraphy of the North Sea basin: Proceedings of the 7th Biannual RCNPS & RCNNS Meeting. Leuven: Leuven University Press, 2001.

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Widmark, Joen G. V. Deep -sea benthic foraminifera from Cretaceous-Paleogene boundary strata in the south Atlantic: Taxonomy and paleoecology. Oslo: Scandinavian University Press, 1997.

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International Symposium on Mammalian Biostratigraphy and Paleoecology of the European Paleogene (1987 Mainz, Rhineland-Palatinate, Germany). International Symposium on Mammalian Biostratigraphy and Paleoecology of the European Paleogene, Mainz, February 18th-21st, 1987: [proceedings]. München: F. Pfeil, 1987.

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service), SpringerLink (Online, ed. The Paleogene and Neogene of Western Iberia (Portugal): A Cenozoic record in the European Atlantic domain. Berlin, Heidelberg: João Pais, 2012.

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Book chapters on the topic "Paleontology – Paleogene"

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Stucky, Richard K., Leonard Krishtalka, and Mary R. Dawson. "Paleontology, geology and remote sensing of Paleogene rocks in the northeastern Wind River Basin, Wyoming, USA." In Mesozoic/Cenozoic Vertebrate Paleontology: Classic Localities, Contemporary Approaches. Salt Lake City, Utah to Billings, Montana, July 19–27, 1989, 34–44. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft322p0034.

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Nyborg*, Torrey, and E. Bruce Lander*. "Vertebrate paleontology and Cenozoic depositional environments of Death Valley National Park, California, USA." In Field Excursions from Las Vegas, Nevada: Guides to the 2022 GSA Cordilleran and Rocky Mountain Joint Section Meeting, 1–22. Geological Society of America, 2022. http://dx.doi.org/10.1130/2022.0063(01).

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ABSTRACT The vertebrate paleontology, lithostratigraphies, and depositional environments of the Cenozoic continental Titus Canyon and Furnace Creek Formations have been the subjects of several recent investigations. The two units are exposed in the Amargosa Range in northeastern Death Valley National Park, Inyo County, southeastern California, USA. Fossil tracks and trackways are preserved in playa mudflat deposits of the Pliocene Furnace Creek Formation at the Cow Creek tracksite on the western slope of the central Funeral Mountains. The tracksite includes footprints of birds and land mammals, as well as associated sedimentary structures. The lower red beds of the Titus Canyon Formation have produced numerous fossilized bones and teeth at Titus and upper Titanothere Canyons in the southeastern half of the Grapevine Mountains. The fossil remains represent 17 extinct genera and species of land mammals and one genus and species of pond turtle. The taxa constitute the Titus Canyon Fauna. The rodents Quadratomus? gigans and Dolocylindrodon texanus, the bear dog Daphoenictis n. sp. (small), and the tapir Colodon stovalli are associated elsewhere only in the correlative, late early late Duchesnean Upper Porvenir Local Fauna of Trans-Pecos or Far West Texas. The local fauna occurs in the Blue Cliff Horizon (i.e., above lower marker bed) in the lower part of the Chambers Tuff Formation. The two assemblages share 12 species. The age of the latter unit is constrained by corrected single-crystal laser-fusion 40Ar/39Ar dates of 37.83 ± 0.09 Ma for the underlying Buckshot Ignimbrite and 37.14 ± 0.08 Ma for the overlying Bracks Rhyolite. However, both determinations should be considered tentative and subject to change with further investigation. The first green conglomerate unit of the Titus Canyon Formation overlies the lower red beds, underlies the Monarch Canyon Tuff Bed, and has produced the first records of land mammal footprints and a land plant (petrified palm wood) from the formation. The Monarch Canyon Tuff Bed and the Unit 38 Tuff Bed, which lies at the mutual tops of the upper “red beds” and the Titus Canyon Formation, are 34.7 ± 0.7 m.y. old and 30.4 ± 0.6 m.y. old, respectively, based on recalculated 40Ar/39Ar dates. Consequently, the Titus Canyon Formation is latest middle Eocene to earliest Oligocene in age, according to the 2020 Paleogene time scale.
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Conference papers on the topic "Paleontology – Paleogene"

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Vitek, Natasha, Doug M. Boyer, Suzanne G. Strait, and Jonathan I. Bloch. "THE PHENOMIC TOOLKIT AND PALEONTOLOGY: A CASE STUDY USING PALEOGENE MARSUPIALS." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-356739.

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2

Davis, Sarah N., Sarah W. M. George, Roy A. Fernández, Sergio Soto Acuña, Marcelo A. Leppe, Brian K. Horton, and Julia A. Clarke. "CHRONOLOGY OF DEPOSITION, UNCONFORMITY DEVELOPMENT, AND PALEONTOLOGY OF A CRETACEOUS-PALEOGENE BOUNDARY SITE, MAGALLANES-AUSTRAL BASIN, PATAGONIA." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-340557.

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