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Ozark Plateaus
The Ozark Plateaus are primarily limestone and dolomite, with some shale, sandstone and chert also present. In the eastern edge of the province, these sedimentary rocks have been completely eroded away, exposing Precambrian granite and porphyries. This area is collectively known as the St Francois Mountains, although relief does not exceed 240 m (800 ft) excepting a few distinct peaks. One of these, Taum Sauk, is Missouri's tallest peak at 540 m (1,772 ft).
The province also is home to the Lake of the Ozarks, an artificial lake and popular tourist attraction, and several springs of considerable magnitude. Notable springs include Mammoth Spring and Big Spring, considered to be among the largest in the world. The area has also been mined for lead and zinc, from the minerals galena and sphalerite. - US NPS