Skip to main content
U.S. flag

An official website of the United States government

Geologic map of the Seldovia quadrangle, south-central Alaska

January 1, 1999

This is a 1:250,000-scale map of the bedrock geology of the Seldovia quadrangle, south-central Alaska. The map area covers the southwestern end of the Kenai Peninsula, including the Kenai Lowlands and Kenai Mountains, on either side of Kachemak Bay. The waters of Cook Inlet cover roughly half of the map area, and a part of the Alaska Peninsula near Iliamna Volcano lies in the extreme northwest corner of the map. The bedrock geology is based on new reconnaissance field work by the U.S. Geological Survey during parts of the 1988-1993 field seasons, and on previous mapping from a number of sources. The new mapping focused on the previously little-known Chugach accretionary complex in the Kenai Mountains. Important new findings include the recognition of mappable subdivisions of the McHugh Complex (a subduction melange of mostly Mesozoic protoliths), more accurate placement of the thrust contact between the McHugh Complex and Valdez Group (Upper Cretaceous trench turbidites), and the recognition of several new near-trench plutons of early Tertiary age.

Publication Year 1999
Title Geologic map of the Seldovia quadrangle, south-central Alaska
DOI 10.3133/ofr9918
Authors Dwight C. Bradley, Timothy M. Kusky, Peter J. Haeussler, Susan M. Karl, D. Thomas Donley
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 99-18
Index ID ofr9918
Record Source USGS Publications Warehouse