Sedimentology and Stratigraphy of the Miocene-Pliocene Bouse Formation near Cibola, Arizona and Milpitas Wash, California: Implications for the Early Evolution of the Colorado River

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dc.contributor.advisorDorsey, Rebeccaen_US
dc.contributor.authorHoman, Mindyen_US
dc.date.accessioned2015-01-14T15:58:48Z
dc.date.available2015-01-14T15:58:48Z
dc.date.issued2015-01-14
dc.description.abstractThe ~5.6-4.8 Ma Bouse Formation, exposed along the lower Colorado River, contains a well exposed but debated record of river integration. Sedimentologic and stratigraphic analysis aid interpretation of depositional processes, relative water depth, depositional environments, stratal architecture, and basin-filling history. Data collected include detailed measured sections, facies descriptions, and fault measurements. Seven lithologically distinct units have been identified along with numerous marine sedimentary structures and fossils. The Bouse Formation preserves a systematic sequence-stratigraphic architecture that records two cycles of base level rise and fall. Lacustrine versus estuarine interpretation remains elusive, though new isotope and micropaleontology data suggest a shift from marine to lacustrine. Constructed stratigraphic facies panels reveal a wedging geometry indicative of syn- to post-depostional tilting, leading us to propose a "sag basin" model during deposition of the Bouse. Finally, the newly described Bouse upper limestone unit resolves a long-standing debate over the age of the first through-going river.en_US
dc.identifier.urihttps://hdl.handle.net/1794/18736
dc.language.isoen_USen_US
dc.publisherUniversity of Oregonen_US
dc.rightsAll Rights Reserved.en_US
dc.subjectBouse Formationen_US
dc.subjectColorado Plateauen_US
dc.subjectColorado Riveren_US
dc.subjectMixed Carbonate and Siliciclasticen_US
dc.subjectSag Basinen_US
dc.subjectSedimentology and Stratigraphyen_US
dc.titleSedimentology and Stratigraphy of the Miocene-Pliocene Bouse Formation near Cibola, Arizona and Milpitas Wash, California: Implications for the Early Evolution of the Colorado Riveren_US
dc.typeElectronic Thesis or Dissertationen_US
thesis.degree.disciplineDepartment of Geological Sciencesen_US
thesis.degree.grantorUniversity of Oregonen_US
thesis.degree.levelmastersen_US
thesis.degree.nameM.S.en_US

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