The Show-Me State has plenty of geology to show, including the
biggest entry room of any cave in North America, the largest lead
deposit in the United States, and the only exposures in the Midwest
of a large province of 1.48-billion-year-old granite and rhyolite.
Geologic history is still being made here, too. In 1811 and 1812,
an unprecedented series of magnitude 7 and 8 earthquakes rocked
southeast Missouri, liquefying the floodplain sediments and
temporarily blocking the flow of the Mississippi River.
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