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dc.contributor.authorWallace, Zachary
dc.date.accessioned2011-08-30T19:29:48Z
dc.date.available2011-08-30T19:29:48Z
dc.date.issued2011-08-30
dc.date.submittedJuly 2011
dc.identifier.urihttp://hdl.handle.net/1928/13115
dc.description.abstractThis study focuses on high-frequency, subtidal-carbonate cycles (1-8 m thick) within the Woodhurst Member of the Lower Mississippian Lodgepole Formation of southwest Montana. We combined conodont-oxygen isotopes (δ18Oapatite¬) and carbonate-carbon isotopes (δ13Ccarb) with cyclostratigraphy of Woodhurst cycles to test the hypothesis that the cycles developed in response to glacial eustasy, evaluate the timing and initiation of the Late Paleozoic Ice Age (LPIA), and to better understand the carbon budget in response to cycle formation. δ18Oapatite trends across targeted cycles support the hypothesis of glacial eustatic origins along with cooling surface seawater temperatures. High-resolution δ13Ccarb analysis of whole-rock limestones within eleven cycles reveal invariant or nonsystematic δ13Ccarb trends, but the long term trend confirms a major positive excursion reported in previous studies of coeval deposits, values peak at ~ 7.5 ‰ in the upper S. isosticha conodont Zone.en_US
dc.language.isoen_USen_US
dc.subjectEarly Mississippian, Conodonts, Lodgepole Formation, Cyclesen_US
dc.subject.lcshGeology, Stratigraphic--Mississippian.
dc.subject.lcshCyclostratigraphy--Montana.
dc.subject.lcshConodonts--Montana.
dc.subject.lcshGlacial isostasy.
dc.titleInvestigating evidence of high frequency glacial eustacy in the Lower Mississippian (Tournasian) Lodgepole Formation of southwest Montana : insights from conodont oxygen isotopesen_US
dc.typeThesisen_US
dc.description.degreeEarth and Planetary Sciencesen_US
dc.description.levelMastersen_US
dc.description.departmentUniversity of New Mexico. Dept. of Earth and Planetary Sciencesen_US
dc.description.advisorElrick, Maya
dc.description.committee-memberAtudorei, Viorel
dc.description.committee-memberFawcett, Peter


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