From Morrow and Withrow “This chert occurs in the area of Rock Island/Moline, Ill. And is of Pennyslvanian age. Color ranges from light gray to blue-black and is often streaked and speckled with black carbonized plant remains.”
From Morrow and Withrow “This chert occurs in the area of Rock Island/Moline, Ill. And is of Pennyslvanian age. Color ranges from light gray to blue-black and is often streaked and speckled with black carbonized plant remains.”
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