No current usage.
(†Eastland Formation (TX) replaced with Caddo Creek Formation of Canyon Group. See Caddo Creek.)
Late Pennsylvanian (Virgilian)
Named from Eastland, Eastland Co., Brazos River Valley, central northern TX (US geologic names lexicons, USGS Bull. 896, 1200).
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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).