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U.S. Geological Survey
Scientific Investigations Report 2005-5019

The Togiak-Tikchik Complex of Southwestern Alaska, a Replacement for the Gemuk Group: Stratigraphic Nomenclature That Has Outlived Its Time

By F.H. Wilson and W.L. Coonrad


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Geologic map of part of the Taylor Mountains 1:250,000-scale quadrangle, southwestern Alaska, showing location of type area of the Gemuk Group

During early exploratory reconnaissance of southwestern Alaska in the 1940s and 1950s, the term "Gemuk Group" was used to name a varied assemblage of sedimentary and volcanic rocks in southwestern Alaska. Throughout the 1950s and early 1960s, the name was broadly applied in the region; yet by the end of the 1960s, it was no longer in use, and later maps assigned the rocks originally in this unit to various informal units and, later, to various terranes. The name "Gemuk Group" is herein abandoned, and the rocks previously assigned to the Gemuk Group, a diverse and structurally complex assemblage, are renamed the "Togiak-Tikchik Complex."

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Maintained by: Michael Diggles
Created: December 12, 2005
Last modified: December 12, 2005 (mfd)