Ordovician carbonates of the Platteville Formation overlie slope-forming mudstones of the Glenwood Formation exposed in roadcut along Limestone Road, Cannon Falls, MN.
Tag: Minnesota
Upper Cambrian Jordan Sandstone and Ordovician Oneota Dolomite, Weaver, MN
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Roadcut of Late Cambrian Jordan Sandstone and overlying Ordovician Oneota Dolomite along Wabasha County 26, near Weaver, MN, illustrating large-scale crossbeds and unconformable formation boundary.
Ordovician Platteville Formation, Sogn, MN
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Ordovician carbonates and marls of the Platteville Formation exposed in roadcut along Goodhue County 14, Sogn, MN.
Ordovician Platteville Formation, Saint Paul, MN
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Finely bedded Ordovician carbonates and marls of the Platteville Formation, Mississippi River bluffs, Saint Paul, MN. Close up of coarse shell lag within the bed that crops out halfway up the section on the right side of the image below.
Late Cambrian Jordan Sandstone, HW14 roadcut near Lewiston, MN
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Large roadcut of Late Cambrian Jordan Sandstone and overlying Ordovician Oneota Dolomite between Stockton and Lewiston, MN, illustrating low-angle bedding, intraclasts, and several scales of cross-stratification.
Cross-stratified Late Cambrian Jordan Sandstone, Homer, MN
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Cross-stratified Late Cambrian Jordan Sandstone, Homer, MN.
Stromatolitic carbonates, Shakopee Formation, Ordovician Prairie du Chien Group, Northfield, MN
Early Ordovician carbonates of the Shakopee Formation of the Prairie du Chien Group exposed in the valleys of the Cannon River and Lyman Creek in Northfield, MN.
