No current usage.
(Rocks of †Mud Springs Mountain Formation of El Paso Group (NM) reallocated to McKelligon Limestone of El Paso Group. See McKelligon.)
Early Ordovician (Ibexian)
Named from exposures in Mud Springs Mountains, near Hot Springs, [a few mi northwest of Truth or Consequences], Sierra Co., southwestern NM (Flower, 1964).
Orogrande 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 ([ ]).