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National Geologic Map Database

Geologic Unit: Hamlin

Usage:

Hamlin Shale Member of Janesville Shale of Admire Group (KS*,NE*,OK*)


Subunits:

MEMBER STATUS (alphabetical) --all in KS*,NE*: Houchen Creek Limestone Bed, Oaks Shale Bed, Stine Shale Bed.


Geologic age:

Late Pennsylvanian (Virgilian)


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

Type locality not designated. Origin of name not stated by author; Hamlin was included in section from Forest City, MO, to Dubois, NE (Condra, 1935; US geologic names lexicons, USGS Bull. 896, 1200).


AAPG geologic province:

Chautauqua platform*
Cherokee basin*
Forest City basin*
Nemaha anticline*


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 ([ ]).