Usage:
Arroyo Formation of Clear Fork Group (TX*)
Subunits:
(alphabetical) --all in TX: Kirby Lake Dolomite Member, /Lytle Limestone Member, Rainy Limestone Member*, Standpipe Limestone Member*.
Geologic age:
early Permian*
Type section, locality, area and/or origin of name:
Notable exposures on and near Los Arroyo, 2.25 mi west of Ballinger, Runnels Co., central TX (Beede and Waite, 1918).
AAPG geologic province:
Permian basin*
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 ([ ]).