Usage:
No current usage?
(†Hanna Valley Bed (TX) considered abandoned? Uncertain if used by the TX Geol. Survey. Abandoned by the USGS.)
Geologic age:
Pennsylvanian
Type section, locality, area and/or origin of name:
Named from Hanna Valley, San Saba Co. or Mills Co., Colorado River region, central TX (US geologic names lexicon, USGS Bull. 896).
AAPG geologic province:
Bend arch
Fort Worth syncline
Llano uplift
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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).