Contrasting hypotheses for the depositional paleoenvironments of the late Miocene to early Pliocene southern Bouse Formation currently hinder progress toward a consensus on tectonic and paleogeographic reconstructions for the lower Colorado River region. The basal carbonate member of the southern Bouse Formation has been interpreted to record deposition in either (i) a large inland lake isolated from the ocean, or (ii) a transgressive intertidal to subtidal marine seaway. In this study, we analyze sedimentary lithofacies, facies associations, paleocurrents, and architecture of large-scale compound bedforms to develop a comprehensive depositional model. Our paleocurrent data and analyses of bedform architecture and facies association support a tidal origin for the southern Bouse Formation. Our paleogeographic reconstruction constrains the location of marine connection required by paleontological and sedimentary data. Our interpretation provides strong evidence in favor of a tidal origin and requires post-Miocene regional uplift.
|Advisor:||Dorsey, Rebecca J|
|Commitee:||Miller, Marli, Retallack, Gregory|
|School:||University of Oregon|
|Department:||Department of Geological Sciences|
|School Location:||United States -- Oregon|
|Source:||MAI 81/4(E), Masters Abstracts International|
|Keywords:||Carbonates, Compound Bedforms, Sedimentology, Stratigraphy, Tidal|
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