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National Geologic Map Database

Geologic Unit: Hidden Falls

Usage:

Hidden Falls Bed of McGregor Member of Platteville Formation (MN)


Geologic age:

Late Ordovician (Mohawkian; Turinian)


Type section, locality, area and/or origin of name:

Type section: in Hidden Falls Park, on the Mississippi River 0.5 mi south of Ford Motor Company plant, St. Paul, Ramsey Co., MN (Sloan, 1956).


AAPG geologic province:

Sioux uplift


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).