The Past Speaks to You the Story of Geology in Illinois volume 7 Rev 1965
The Past Speaks to You the Story of Geology in Illinois volume 7 Rev 1965
Elizabeth Ann Livesay
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), in southwest Illinois around Bald Knob and the Pine Hills (Union Co. ), and around Grand Tower (Jackson Co. ) where the Devonian limestones help to form some of the most rugged scenery in the State. Where they are found buried beneath younger rocks in south central Illinois, the Devonian rocks provide great quantities of oil. MISSISSIPPIAN TIME Gradually earth history passed from the Devonian into the Mississippian Period and again an interior sea invaded the land to leave its record of lime...stone and fossils of 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. ). The fact that land and sea fluctuated back and forth often during the Mississippian Period is mutely recorded in the rocks themselves.
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