The Past Speaks to You the Story of Geology in Illinois volume 7
The Past Speaks to You the Story of Geology in Illinois volume 7
Elizabeth Ann Livesay
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) and in southwest Illinois around Bald Knob and the Pine Hills (Union Co. ), and Grand Tower (Jackson Co. ) where the Devonian limestones help to form some of the most rugged scenery in the state. Where the Devonian rocks are found buried beneath younger rocks in south central Illinois, these Devonian lime- stones have yielded the largest oil wells in the state at Salem (Marion Co. ), and oil has been produced from the Devonian rocks in numer- ous "pools" throughout the southern part of the st...ate. Gradually earth history passed from the Devonian into the Mississippian Period and still another interior sea invaded the land to leave its record of limestone and fossils, about 285, 000, 000 years ago. This Mississippian Period in geologic time has been named from the excellent exposures along the Mississippi River in Illinois and the adjacent states of Iowa and Missouri. Limestones of Mis- sissippian age outcrop fairly continuously along the western border of Illinois from near Burlington, Iowa, south to Murphysboro (Jack- son Co.
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