Skip to Main Content
Book Chapter

The Pershing olistostrome: Evidence for the Triassic shelf-basin transition in the western Great Basin

Frederick R. Heck
Frederick R. Heck
Department of Physical Sciences, Ferris State University, Big Rapids, Michigan 49307 USA,
Search for other works by this author on:
January 01, 2000


The Pershing district of the southern Humboldt Range, northwestern Nevada, contains a large, Upper Triassic submarine olistostrome containing carbonate clasts from pebble size to 700 m in length that are supported mostly my lime-mud matrix. The olistostrome comprises debris flows separated by intervals of hemipelagic sedimentation, turbidity flows, and density modified grain flows. The olistostrome body is triangular-prism shaped with a flat top and keel-like base. It lies in a thick sequence of fine-grained siliciclastic rocks. The lower submarine gravity flows were deposited in a preexisting trough at a lower slope or base-of-slope position. The highest gravity flow filled the trough and spilled over its sides. The source of the olistostrome clasts and matrix was a carbonate platform (Dun Glen Formation) to the northeast that formed on the surface of a preexisting shallow-marine delta. The olistostrome and older shelf-basin transitional rocks of the Humboldt Range indicate the existence of a Middle and Upper Triassic shelf-basin transition with an arcuate trace that is convex to the southwest at the southern Humboldt Range.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables


GSA Field Guide

Great Basin and Sierra Nevada

David R. Lageson
David R. Lageson
Department of Earth Sciences Montana State University Bozeman, MT 59717 USA
Search for other works by this author on:
Stephen G. Peters
Stephen G. Peters
Reno Field Office Mackay School of Mines, MS-176 University of Nevada Reno, Nevada 89557-0047 USA
Search for other works by this author on:
Mary M. Lahren
Mary M. Lahren
Department of Geological Sciences MS-l72 University of Nevada Reno, Nevada 89557 USA 2000
Search for other works by this author on:
Geological Society of America
ISBN electronic:
Publication date:
January 01, 2000




A comprehensive resource of eBooks for researchers in the Earth Sciences

This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now