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U.S. Geological Survey
Open-File Report 2006-1124
Version 1.0

Field-Trip Guide to Volcanic and Volcaniclastic Deposits of the Lower Jurassic Talkeetna Formation, Sheep Mountain, South-Central Alaska

By Amy E. Draut, Peter D. Clift, and Robert B. Blodgett


Photo looking down from between steep canyon walls at a river valley.  Snow-capped mountains are present in the background.

This guide provides information for a one-day field trip in the vicinity of Sheep Mountain, just north of the Glenn Highway in south-central Alaska. The Lower Jurassic Talkeetna Formation, consisting of extrusive volcanic and volcaniclastic sedimentary rocks of the Talkeetna arc complex, is exposed on and near Sheep Mountain. Field-trip stops within short walking distance of the Glenn Highway (approximately two hours’ drive from Anchorage) are described, which will be visited during the Geological Society of America Penrose meeting entitled Crustal Genesis and Evolution: Focus on Arc Lower Crust and Shallow Mantle, held in Valdez, Alaska, in July 2006. Several additional exposures of the Talkeetna Formation on other parts of Sheep Mountain that would need to be accessed with longer and more strenuous walking or by helicopter are also mentioned.

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For questions about the content of this report, contact Amy Draut

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Maintained by: Michael Diggles
Date created: July 27, 2006
Date last modified: July 27, 2006 (mfd)