The biostratigraphy and paleoecology of the Gerster limestone (Upper Permian) in Nevada and Utah
Open-File Report
77-470
By: Bruce R. Wardlaw
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Abstract
The Gerster Limestone contains three minor lithofacies: the packstone, wackestone, and mixed facies, differentiated largely on the basis of the carbonate matrix and mud content of the rocks. Five biostratigraphic zones ranging in age from Roadian-Wordian to Wordian are, in ascending order, the Thamnosia, Kuvelousia, transition, Yakovlevia, and
upper zones.
The Gerster was probably deposted in a protected coastal basin separated from the Phosphoria Basin by a shallow marine positive area. The brachiopod fauna is divided into fifteen bioassociations. The fauna is part of a continental margin suite of faunas distributed from west Texas to the Canadian Arctic and belongs to the Tethyan-nonreef biogeographica[ province.
Suggested Citation
Wardlaw, B.R., 1977, The biostratigraphy and paleoecology of the Gerster limestone (Upper Permian) in Nevada and Utah: U.S. Geological Survey Open-File Report 77-470, 125 leaves, [42] leaves of plates :ill., maps ;28 cm.; (124 p. - PGS), https://doi.org/10.3133/ofr77470.
ISSN: 2331-1258 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | The biostratigraphy and paleoecology of the Gerster limestone (Upper Permian) in Nevada and Utah |
| Series title | Open-File Report |
| Series number | 77-470 |
| DOI | 10.3133/ofr77470 |
| Year Published | 1977 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey, |
| Description | 125 leaves, [42] leaves of plates :ill., maps ;28 cm.; (124 p. - PGS) |