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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Petrology of Upper Precambrian and Paleozoic Sandstones in the Pensacola Mountains, Antarctica
Paul L. Williams
ABSTRACT
The sedimentary succession in the Pensacola Mountains, Antarctica, which is more than 9000 m thick, ranges in age from late Precambrian to Permian. The Patuxent Formation of late Precambrian age is a thick sequence of weakly metamorphosed eugeosynclinal slates and subgraywackes. The Wiens Formation of Cambrian(?) age contains subgraywackes, which are rich in volvanic detritus; this detritus was derived from nearby Cambrian volcanic rocks. The overlying Neptune Group and Dover Sandstone of early and middle(?) Paleozoic age consist mostly of quartzite deposited on a slowly subsiding epicontinental shelf; upward decrease in amount of volcanic rock fragments indicates a shift in time from local provenance to a sediment source in the East Antartic Shield. The Gale Mudstone of Permian age i a tillite, which has the composition of a subgraywacke. The youngest rocks in the succession comprise the Pecora Formation (new name) of Permian age and consist of graywackes and carbonaceous siltstones.
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