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National Geologic Map Database

Geologic Unit: Blocher

Usage:

Blocher Member of New Albany Shale (IN*,KY)
Blocher Shale Member of New Albany Shale of Knobs Group (IL)


Geologic age:

late Middle to early Late Devonian (Givetian to Frasnian)*


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

Type section: exposures on Highway 50, 1.5 mi southeast of Blocher and 1 mi east of Baltimore and Ohio RR, Scott Co., IN (Campbell, 1946).


AAPG geologic province:

Cincinnati arch*
Illinois 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 ([ ]).