Permian-Triassic boundary in eastern Nevada and west-central Utah

被引：0

作者：

Collinson, James W. ^{[1
]}

Kendall, Christopher G.St.C. ^{[2
]}

Marcantel, Jonathan B. ^{[3
]}

机构：

[1] Department of Geology and Mineralogy, Ohio State University, Columbus, OH 43210, United States

[2] EXXON Production Research Company, Houston, TX 77001, United States

[3] Shell Oil Company, Houston, TX 77001, United States

来源：

Bulletin of the Geological Society of America | 1976年 / 87卷 / 05期

关键词：

Geology;

D O I：

暂无

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The Permian-Triassic boundary in eastern Nevada and west-central Utah is placed at a disconformity above the Gerster Formation (Wordian) and below the Thaynes Formation (Smithian and Spathian). Evidence of subaerial erosion at the disconformity includes local truncation of Gerster beds by channels filled with chert and quartzite-pebble conglomerate. Westward onlap of Lower Triassic sedimentary deposits, as demonstrated by conodont zones, suggests an east-facing paleoslope over which the Early Triassic sea slowly advanced. The Sonoma orogeny, which coincided with the Late Permian-Early Triassic hiatus, may have been the cause of regional upwarping in eastern Nevada that produced the eastward paleoslope. © 1976 Geological Society of America.

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页码：821 / 824

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