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The AAPG/Datapages Combined Publications Database

Utah Geological Association

Abstract


Uinta Mountain Geology, 2005
Pages 49-62

Paleontology of the Neoproterozoic Uinta Mountain Group

Robin M. Nagy, Susannah M. Porter

Abstract

Sedimentary rocks of the Uinta Mountain Group (northeastern Utah) preserve fossils deposited in a marine setting during middle Neoproterozoic time. Although well preserved, species diversity is much lower than many other midddle Neoproterozoic siliciclastic deposits. Microfossil assemblages are mostly limited to Leiosphaeridia sp., Bavlinella faveolata, and filaments. Diverse ornamented acritarchs, vase-shaped microfossils, and the macroscopic compression fossil Chuaria circularis, also occur, but are much more rare. Although the Uinta Mountain Group does not preserve as wide a range of facies as other middle Neoproterozoic units – the unit is carbonate-free – it is unlikely that preservation alone can account for its relatively limited fossil diversity. Rather, the Uinta Mountain Group likely records deposition in an environment that was inimical to most eukaryotes.


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