"Map of Lake Bonneville (A Water Body of the Quaternary Period)", U.S. Geological Survey (USGS)

Lake Bonneville was a prehistoric inland sea that covered a massive area including about half the present-day state of Utah and parts of southern Idaho and eastern Nevada. When the sea receded it left behind distinctive benches or terraces on the Wasatch Mountains. The Great Salt Lake, Utah Lake and Lake Sevier are modern remnants of this once great inland sea. This map was prepared by G. K. Gilbert assisted by Gilbert Thompson, Israel C. Russell, H.A. Wheeler and Albert I. Webster. A handsome and colorful map.

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Condition: B

Folding, as issued. There are a few fold separations throughout with Scotch Conservation and Preservation Tape #888 on the verso closing them, still an attractive example.