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- W2313736421 abstract "Newbury, Sophia Sims (M.S. Geological Sciences) Sedimentary Response To Climate Change During The Paleocene-Eocene Thermal Maximum, Southeastern Bighorn Basin, Wyoming, U.S.A. Thesis Directed by Professor Mary J. Kraus The Paleocene Eocene Thermal Maximum (PETM) was a rapid episode of dramatic global warming at ~55 MA. This event is recognized by a negative carbon isotope excursion (CIE). In the Bighorn Basin, the lowest ~40 m of the Willwood Formation contains the CIE and represents the sedimentary response to PETM climate change. In the southeastern Bighorn Basin, the PETM interval can be divided into three lithologic units on the basis of alluvial architecture and presence of calcium carbonate nodules. This thesis focus’ on the interval which likely represents the response to peak PETM temperatures. A detailed study of the facies and facies associations of the middle yellow-grey interval reveals that it is sedimentologically distinct from the other PETM intervals. Thick avulsion deposits and weakly developed paleosols dominate this interval. These features indicate that sediment accumulation rates were relatively rapid (and sediment yield was high) and that channel avulsion was frequent. The paleosols and facies architecture of the underlying and overlying lithologic units show slower rates of sediment accumulation. Grain-size analysis reveals that floodplain sediment was coarsest in the yellow-grey interval. Paleoclimate proxies demonstrate the nature of climate changes which occurred during the yellow-grey interval. Carbon isotopes show that the yellow-grey interval corresponds to the main body of the CIE and warmest PETM temperatures. Paleofloral analysis and the presence of" @default.
- W2313736421 created "2016-06-24" @default.
- W2313736421 creator A5080181597 @default.
- W2313736421 date "2010-01-01" @default.
- W2313736421 modified "2023-09-27" @default.
- W2313736421 title "The sedimentary response to climate change during the Paleocene-Eocene Thermal Maximum, southeastern Bighorn Basin, Wyoming, U.S.A" @default.
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