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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Paleoenvironments"”.
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Miocene paleoenvironments and paleosol pH proxies.
Paleoenvironmental analysis is an interdisciplinary endeavor that draws on sedimentology, stratigraphy, geochemistry, and geostatistics. This dissertation includes two paleoenvironmental case studies and the development of a new suite of proxies for soil pH. The first case study was performed at …
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Correlation and Paleoenvironments above West T9.3 Tuff, Pisco Formation, Peru
<p>The Pisco Basin is a Cenozoic forearc basin in west central Peru. Though outcrops are well exposed, contain little diagenetic overprint, or complex structural deformation, only rudimentary correlations between outcrops are published and no attempts have been made to define time-bounded subunits. …
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Lithofacies And Paleoenvironments Of The Becraft Formation (Lower Devonian) Of New York State
The Becraft Formation from the Lower Devonian of eastern New York is a crinoid-brachiopod calcarenite which represents a combination of regressive and transgressive lithologies. Three lithofacies are recognized within the Becraft: Facies 1, a shale and biomicrite interbedded with biosparite, …
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Paleogeography and Paleoenvironments of the Lower Unit, Fossil Butte Member, Eocene Green River Formation, Southwestern Wyoming
<p>During Eocene time sediment accumulated in Fossil Lake, in what developed to be a small linear and structurally controlled basin. Fossil Lake was one of several lakes into which the Green River Formation was deposited in Wyoming, Utah and Colorado.</p> <p>Detailed stratigraphic analysis of the …
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Paleoenvironments of the Eocene Green River Formation (Laney Member) in the Anvil Wash area, Southwestern Wyoming
<p>The study of abundant conchostracans in the Laney Member of the Green River Formation, Wyoming, has contributed to the resolution of the controversy over the depositional environment of finely laminated sediments. Conchostracans that typically live in ephemeral pools, pulmonate gastropods that …
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Reconstructing animal-vectored nutrient fluxes in paleoenvironments: A case-study of Aotearoa New Zealand’s burrowing procellariiforms
… previous efforts to quantify nutrient fluxes in paleoenvironments via a framework that integrates model-based approaches, using burrowing procellariiformes in Aotearoa New Zealand as a case study. In Chapter Two, I demonstrate how merging historic and fossil records can help account for biases in …
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Upward-Shallowing Cycles (PACS) Of The Olney And Elmwood Members, Manlius Formation, New York
… facies. Within this shallowing PAC sequence, paleoenvironments and paleogeography evolved episodically in response to widespread punctuation events at PAC boundaries. Within each PAC of the sequence, paleoenvironments developed gradually as a result of sedimentary aggradation; between PACs …
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Estratigrafia e paleoambientes em rochas da formação gramame nas pedreiras do Roger em João Pessoa – PB.
… presents information on the stratigraphy and Paleoenvironments of the Quarries Roger in João Pessoa - PB, during the Maastrichtian inserted in Gramame formation in the Paraíba Basin. This thesis aimed to gather knowledge stratigraphic and paleoenvironmental existing quarries in the Roger in …
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Climate and habitat reconstruction of hominid sites in northern China with paleosol stable isotopes
… are often contradictory. In order to understand paleoenvironments and the nature of hominid adaptations, evolution and behavioral change, more accurate reconstructions of their environments are needed. Stable isotope geochemistry of paleosols, including carbon isotopes of soil organic matter and …
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Stable isotope paleohydrology of pedogenic carbonates in the Wayan Formation (Albian) from the wedge-top depozone in the North American Cretaceous Western Interior Basin
… sideritic paleosols predominate, indicating paleoenvironments with positive precipitation – evaporation (P-E) balances, local exceptions with negative P-E balances occur on the immediate leeward side of the Sevier Orogen, where calcic paleosols in the wedge-top depozone record …
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Dinoflagellate cysts of the Gymnodiniaceae, Peridiniaceae, and Gonyaulacaceae from the Upper Cretaceous Monmouth Group, Atlantic Highlands, New Jersey
… stratigraphic intervals representing these four paleoenvironments correspond closely to intervals assigned to particular paleoenvironments based on invertebrate fossils and lithology (Owens and Sohl, 1969; Sohl, 1969). Thus, correlation of this previously determined paleoecological data and that …
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Local variability in early Oligocene paleosols as a result of ancient soil catenary processes, Brule Formation, Toadstool Park, Nebraska
… the rock record. When drawing inferences about paleoenvironments based on paleosols, care must be taken to ensure that as many of the soil forming factors as possible are understood. Whereas climates can be ignored over small areas, and lithology represents the medium of soil preservation, …
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Punctuated Aggradational Cycles In The Thacher Member Of The Manlius Formation, Hudson Valley Region, New York
… adjacent facies in each PAC represent contiguous paleoenvironments. Between PACs facies change abruptly at PAC boundaries in response to rapid episodic base-level rises. This small-scale stratigraphic framework permits detailed paleoenvironmental analysis of specific facies with respect to depth …
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Ichnology and sedimentology of large tetrapod burrows in the latest Early Triassic Katberg Formation, south-eastern main Karoo Basin, South Africa
… dissertation are to: 1) reconstruct the local paleoenvironments of the burrow localities; 2) determine the purpose of the burrows; 3) identify the possible burrow makers based on the sedimentology and burrow morphology and 4) attempt to use photogrammetry and low-cost hardware to produce 3D …
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A late Holocene paleoenvironmental reconstruction of a coastal lake in northeastern Dominican Republic
… and terrestrial processes. Although coastal paleoenvironments in the Caribbean have been a subject of increasing interest, long-term environmental reconstructions from lakes on the Atlantic side of the Caribbean islands are lacking. Laguna Limon is a freshwater lake in the El Seibo province …
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Paleopedology And taphonomy Of The Brian Maebius Site, Badlands National Park, South Dakota
… to semi-arid and semi-forested to savanna paleoenvironments within a meandering to anastomosing floodplain setting. Taphonomic data indicates that the Brian Maebius Site contains weakly to moderately weathered, disarticulated, fluvially abraded, carnivore processed, and mostly randomly …
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Paleogene-Early Neogene palynomorphs from the Eastern Equatorial Atlantic and Southeastern Florida, USA: Biostratigraphy and paleoenvironmental implications
… between restricted marine and open marine paleoenvironments were inferred in the W-17001"--Abstract, page v.</p>
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Establishing geochemical constraints on mass accumulation rates across the Cretaceous-Paleogene boundary with extraterrestrial Helium-3
… of the impact-related perturbations in different paleoenvironments, we performed a high-resolution analysis at Caravaca and lower-resolution analyses at the other three sections. We find that Hojerup and Kulstirenden are not suitable for this analysis due to the probable variation in the flux of …
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Paleoecology and Taphonomy of Ediacaran macrofossils from the Khatyspyt Formation, Olenek Uplift, Siberia
… to reconstruct the taphonomy, paleoecology, and paleoenvironments of Aspidella fossils. The third chapter presents results from a comprehensive analysis of macroalgae from Proterozoic to early Paleozoic. In this study, a database of macroalgal fossil was updated and analyzed in order to gain …
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