http://bit.ly/1zfNXza The yellow band of hills across Southern Illinois are the edge of glacier debris. You can see picturesque leftover boulders at Giant City State Park, near Carbondale, Fern Clyffe State Park near Marion, the long "Goreville hill" on I-57, and the beautiful Garden of the Gods near Harrisburg, where signs say it took the glacier a few hundred years to melt. Illinois glaciation An old Ohio riverbed curved sharply westward, just south of present Golconda in SE Illinois (thin dark blue on top map, yellow on smaller map below, increasing in width westward) running a few miles south of the present Illinois Route 146. Most of the dark blue of Illinois in upper map is the present Cache River Basin and Natural Area. http://bit.ly/1zY7dni
New Madrid Area Once Had a Seashore, Rivers Rerouted
http://bit.ly/1zfNXza The yellow band of hills across Southern Illinois are the edge of glacier debris. You can see picturesque leftover boulders at Giant City State Park, near Carbondale, Fern Clyffe State Park near Marion, the long "Goreville hill" on I-57, and the beautiful Garden of the Gods near Harrisburg, where signs say it took the glacier a few hundred years to melt. Illinois glaciation An old Ohio riverbed curved sharply westward, just south of present Golconda in SE Illinois (thin dark blue on top map, yellow on smaller map below, increasing in width westward) running a few miles south of the present Illinois Route 146. Most of the dark blue of Illinois in upper map is the present Cache River Basin and Natural Area. http://bit.ly/1zY7dni
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