Usage:
Polvadera Group (NM*)
Subunits:
(alphabetical) --all in NM*: El Rechuelos Rhyolite, Lobato Basalt, Tschicoma Formation.
Geologic age:
Tertiary*
Pliocene, late*
Quaternary*
Pleistocene, early*
Type section, locality, area and/or origin of name:
Not designated. Named from Polvadera Peak, second-highest peak in northern Jemez Mountains, in T. 21 N., R. 5 E., Rio Arriba Co., NM (Bailey and others, 1969).
AAPG geologic province:
San Juan 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 ([ ]).