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This carbonate formation, the Bonneterre now mostly dolomite, is exposed around the St.
Francis mountains, but extends in the subsurface throughout the Ozarks and reaches a thickness of 400 to 1,500 feet (120 to 460 m).
The formations are separated by steep escarpments that dramatically interrupt the rolling hills.
The Boston Mountains portion of the Ozarks extends north of the Arkansas River Valley 20 to 35 miles (32 to 56 km) and is approximately 200 miles (320 km) and are bordered by the Springfield and Salem Plateau to the north of the White River.
By the early 20th century, the Ozarks had become a generic term.
Geographic features include limestone and dolomite glades, which are rocky, desert-like area on hilltops.
The seas encroached during the late Cambrian producing the Lamotte Sandstone, 200 to 300 feet (61 to 91 m) thick, followed by carbonate sedimentation.
Coral reefs formed around the granite and rhyolite islands in this Cambrian sea.
An alternative origin for the name "Ozark" involves the French term aux arcs.