U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Ellsworth

Usage:

Ellsworth Shale (IN*,MI*)
Ellsworth Member of New Albany Shale (IN)


Subunits:

Henryville and Jacobs Chapel Beds (IN)


Geologic age:

Late Devonian to Early Mississippian (Famennian to Kinderhookian)*


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

Type locality: Petoskey Portland Cement Company quarry, about 1.5 mi south of Ellsworth, in NE/4 NE/4 sec. 26, T. 32 N., R. 8 W., Banks Twp., Antrim Co., south-central MI (Newcombe, 1932; 1933).


AAPG geologic province:

Illinois basin*
Michigan basin*


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

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).