Pg. 374, 383. Hanna Valley bed in Strawn division. Clay, 200 or more feet thick, with some shaly sandstone, in places. Member of Strawn division [Strawn is 2nd from base of 5 Carboniferous divisions of Cummins, 1891]. Overlies Cottonwood Creek bed and underlies Rough Creek bed. Age is Pennsylvanian.
[Named from Hanna Valley, San Saba Co. or Mills Co., Colorado River region, central TX.]
Source: US geologic names lexicon (USGS Bull. 896, p. 906).
Pg. 74. Hanna Valley bed in Strawn series. Clay, about 200 feet thick. Underlies Rough Creek bed; overlies Cottonwood Creek bed. [Age is Pennsylvanian; age of Strawn not discussed.]
[Report area in Parker County, central Texas.]
Source: US geologic names lexicon (USGS Bull. 1200, p. 1664); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).
Pg. 58, pl. 27. [†Hanna Valley bed of Strawn formation not used by the USGS; a local term considered obsolete. See also entry under Strawn.] Drake (1893) separated rocks of Strawn group [division] into 20 units of alternating sandstone and shale beds. He gave local names to these units, or "beds" as he termed them, and numbered them from bottom to top, 4 to 23. Only Drake's name for upper unit, the Ricker, is in common use today, and that name has been restricted to the base of Drake's Ricker bed.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1664).
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 ([ ]).