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Showing results for tags 'upper mississippian'.
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Today I was in Southern Illinois and made a Quick stop at a road cut near Anna, Illinois, just off of Interstate 57. This exposure is: Upper Mississippian Middle Chesterian Series Golconda Formation Harvey Member I found a few nice hash plates and some blastoids, Archimedes’ screw, brachiopods, Horn coral, Bryozoan, crinoid stems and one trilobite pygidium.