- Usage in publication:
-
- Puercan age
- Modifications:
-
- Original reference
- AAPG geologic province:
-
- North America
Summary:
Pg. 8, pl. 1. Puercan age. Provincial time term, based on the Puerco formation of the San Juan basin, northwestern New Mexico, type locality, Rio Puerco area. Covers the interval from Upper Cretaceous to Dragonian (Paleocene) time. [In lower part of Paleocene; = TAENIOLABIS faunal zone.]
Most typical and only fossiliferous exposures, the escarpment running from northwest of Ojo Alamo about 25 mi to Arroyo Eduardo, east of Kimbetoh, [New Mexico].
Report defines 18 provincial time terms, based on mammal-bearing units, for the North American continental Tertiary. [Ascending] Paleocene: Puercan, Dragonian, Torrejonian, Tiffanian, and Clarkforkian; Eocene: Wasatchian, Bridgerian, Uintan, and Duchesnean; Oligocene: Chadronian, Orellan, and Whitneyan; Miocene: Arikareean, Hemingfordian, and Barstovian; Pliocene: Clarendonian, Hemphillian, and Blancan.
Source: US geologic names lexicon (USGS Bull. 1200, p. 3151-3152).
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 ([ ]).