Usage:
Blancan age*
A provincial North American land mammal age (NALMA). Between Hemphillian and Irvingtonian.
Geologic age:
late Tertiary (Pliocene)*
Type section, locality, area and/or origin of name:
Name based on the local fauna at "Mt. Blanco" and the adjoining draws, near the "old rock house" north of Crawfish Draw, Crosby Co., TX Panhandle (Wood and others, 1941).
AAPG geologic province:
North America*
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 ([ ]).