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| View Original: | Cummingsville Formation Decorah Iowa.jpg (3000x2000) | |||
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| Keywords: Cummingsville Formation Decorah Iowa.jpg en Cummingsville Formation Upper Ordovician exposed in Decorah Iowa The Cummingsville is the brown upper unit; the Decorah Formation is below 2016-07-31 11 43 30 own Wilson44691 other versions cc-zero Limestone formations Ordovician geology of North America Geologic formations in Iowa | ||||
