Late Jurassic through Early Cretaceous strata of the Gannett Group record initial development of the Sevier thrust belt and adjacent foreland basin. Concepts of nonmarine sequence stratigraphy were used to determine the depositional and base level history of the Gannett Group in southeastern Idaho and western Wyoming. Base level fluctuations were driven entirely by tectonic processes, while tectonic uplift in the source area was a major control on sequence development. Six measured sections were revisited or measured and correlated using the concepts of sequence stratigraphy. Four distinct sequences were identified and correlated. Each sequence can be divided into degradational, transitional, or aggradational systems tracts. Where the degradational systems tracts are preserved, they are represented by thin conglomerates. Transitional systems tracts overly the degradational systems tracts and consist of thick sections of laterally discontinuous sandstone and fluvial overbank muds, which grade laterally into continuous limestone and calcareous mudstones that comprise the aggradational systems tract.
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|Advisor:||Lock, Brian E.|
|Commitee:||Bishop, Catherine, Borrock, David, Duex, Timothy W.|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 55/03M(E), Masters Abstracts International|
|Subjects:||Geology, Sedimentary Geology|
|Keywords:||Fluvial, Non-marine, Sequence stratigraphy|
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