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TOP ROW: This waterfall spills over the top of the Upper Ordovician (Mohawkian) Platteville Limestone along the Mississippi River near downtown St. Paul, Minnesota.*
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| Above the Platteville is 90 feet of Decorah Shale. CLICK these images to enlarge.*
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| The Decorah Shale is capped by the Galena Formation which is in turn topped by Pleistocene glacial gravels.*
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MIDDLE ROW: The Wangs roadcut near Northfield exposes the St. Peter Sandstone...*
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| ...the Platteville (not shown), then the Decorah Shale...
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| ...and the Cummingsville Member of the Galena Formation.*
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BOTTOM ROW: This is the Upper Devonian (Frasnian) Lime Creek Formation at Rockford, Iowa.*
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| Collecting at the Rockford Pit can be a bit rigorous...*
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| ..or simply picking up 367 million year old fossils right off the ground at your feet*
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