St. Francois Mountains
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The St. Francois Mountains in southeast Missouri are a mountain range of Precambrian igneous mountains rising over the Ozark Plateau. This range is one of the oldest exposures of igneous rock in North
A view towards the St. Francois range from Knob Lick Mountain, a granite and rhyolite knob on the edge of the range
Boulders in Elephant Rocks State Park are residual boulders of weathered Graniteville Granite, a pluton formed 1.4 billion years ago in the Proterozoic by the cooling of magma.
Granite from this region was used for cobblestones on the St. Louis wharf and in the piers of the Eads Bridge (background).
Taum Sauk Mountain is the highest point in Missouri.
Johnson's Shut-Ins State Park is a public recreation area covering 9,432 acres on the East Fork Black River in Reynolds County, Missouri. The state park is jointly administered with adjoining Taum Sau
A portion of the park's natural water park pictured after the 2009 reopening
The "scour", eight years after the flood, through what had been dense forest below the since-rebuilt reservoir.
East Fork Black River confined within Proterozoic rhyolite at Johnson's Shut-Ins State Park, Reynolds County, Missouri. CC0 photograph by the Public Lands Institute.