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National Geologic Map Database

Geologic Unit: Jacobsville

Usage:

Jacobsville Sandstone of Keweenawan Supergroup (MI*,WI*)
Jacobsville Sandstone (OH*-subsurface)


Geologic age:

Middle Proterozoic*


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

Exposures near town of Jacobsville on Keweenaw Peninsula, Houghton Co., Northern Peninsula, northwestern MI (Lane and Seaman, 1907).


AAPG geologic province:

Lake Superior region*
Wisconsin arch*
Michigan basin*


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).