Horsehead Lake is a small U.S. Forest Service lake located in western Johnson County, Arkansas, at the juncture of the Boston Mountains and the Arkansas River Valley (Fig. 1). To reach the lake, take Arkansas 164 north from 1-40 (the Hunt-Coal Hill exit). From downtown Hunt, continue 2.8 mi (4.5 km) north on Arkansas 164 to the entrance to Horsehead Lake. Walk across the dam to the spillway cut.
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One of six volumes generated by each GSA section for the Decade of North American Geology (DNAG) project, this Centennial Field Guide contains descriptions of 100 sites or site clusters representing outstanding geologic locations in Arkansas, Kansas, Oklahoma, and Texas.