§ 5.5. Geology

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According to the Clark County Outdoor Recreation Plan 1999 to 2003, the bedrock geology of the county consists mainly of Upper Cambrian age standstone. Precambrian crystalline rock underlies the northernmost and eastern portions of the county. The sandstone has been eroded away, exposing the crystalline rock along the Black River and its tributaries. The Cambrian sandstone is generally less then 50 feet thick in the majority of the county. The exception is the southwestern portion of the county. Here the most recent glacier activity has not eroded away the sandstone. In this area, the sandstone is more than 50 feet thick.

                    
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