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

Geologic Unit: Lohn

Usage:

Lohn Shale Member of Thrifty Formation of Cisco Group (TX*-recognized locally in Colorado River Valley, central TX)


Geologic age:

Late Pennsylvanian (Virgilian)*


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

Named from its good development near Lohn, a post office on the Waldrip-Brady road, 8 to 9 mi from Waldrip, McCulloch Co., Colorado River region, central TX (Drake, 1893).


AAPG geologic province:

Bend arch


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 ([ ]).