Central Uinta Mountains, Utah
Precambrian Research 236 (2013) 65–84 Contents lists available at ScienceDirect Precambrian Research jou rnal homepage: www.elsevier.com/locate/precamres Sequence stratigraphy and formalization of the Middle Uinta Mountain Group (Neoproterozoic), central Uinta Mountains, Utah: A closer look at the western Laurentian Seaway at ca. 750 Ma a,∗ a,1 a b Esther M. Kingsbury-Stewart , Shannon L. Osterhout , Paul K. Link , Carol M. Dehler a Department of Geosciences, M.S. 8072, Idaho State University, Pocatello, ID 83209, United States b Department of Geology, 4505 Old Main Hill, Utah State University, Logan, UT 83422, United States a r t a b i s c l e i n f o t r a c t Article history: The mid-Neoproterozoic (ca. 750 Ma) Uinta Mountain Group (UMG), northeast Utah, USA, records trans- Received 3 November 2012 gressions of an epicontinental sea at least 150 million years before inception of the Laurentian western Received in revised form 18 June 2013 passive margin. This work refines middle UMG stratigraphy by formalizing three lithostratigraphic Accepted 20 June 2013 formations and interpreting a sequence stratigraphic framework in the central part of the Uinta Moun- Available online 19 July 2013 tains. Middle UMG marine and fluvial-deltaic facies associations comprise eight depositional sequences within a kilometer-thick upward-fining composite sequence. These depositional sequences form one Keywords: progradational–aggradational (“lowstand”) sequence set (PASS) and one aggradational–progradational Neoproterozoic (“highstand”) sequence set (APSS). Depositional sequences were deposited within a tide- and wave- Uinta Mountain Group Rodinia affected epicontinental seaway that received sediment from a south-flowing fluvial system proximally Laurentia sourced in the Neoarchean southern Wyoming Province to the north and from a separate system of major, Sequence stratigraphy west-flowing trans-Laurentian rivers distally sourced in the Grenville orogen, the mid-continent granite Detrital zircon province, and the Yavapai and Mazatzal provinces to the south and east.
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