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Interpretation of depositional environment in the Plympton Formation (Permian), Southern Pequop Mountains, Nevada, from physical stratigraphy and a faunule

Journal of Research of the U.S. Geological Survey
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Abstract

Field mapping in the southern part of the Pequop Mountains has shown the presence of a major structural high which has profoundly affected the stratigraphy of Pennsylvanian and Lower Permian beds; lesser effects of this high persisted into the later Permian.  Within the Park City Group (Permian), the Plymton Formation, overlying the Kaibab Limestone, is divided informally into five parts.  The uppermost Plympton has yielded silicified fossils. The faunule studied is characterized by the scaphopod Plagioglypta and by bellerophontacean and neritacean gastropods, suggestive of a middle Permian age.  Specimens are worn, and several lines of evidence suggest that this is a high-energy beach deposit associated with a residual high.  The interpretation supplements the field evidence of a hiatus between the Plympton and the overlying Gerster Formation. Other occurrences of elements of the faunule in the equivalent Phosphoria rock complex are noted, but only a few were probably deposited in a high-energy beach environment. A new species of Naticopsis that has the color pattern preserved is named and described.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Interpretation of depositional environment in the Plympton Formation (Permian), Southern Pequop Mountains, Nevada, from physical stratigraphy and a faunule
Series title Journal of Research of the U.S. Geological Survey
Volume 1
Issue 1
Year Published 1973
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description 15 p.
First page 19
Last page 33
Country United States of America
State Nevada
Other Geospatial Pequop Mountains
Online Only (Y/N) N
Additional Online Files (Y/N) N
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