Usage:
Porvenir Formation of Madera Group (NM*-recognized locally in Sangre de Cristo Mountains)
Geologic age:
Middle Pennsylvanian (Desmoinesian)*
Type section, locality, area and/or origin of name:
Type section: along U.S. Forest Service Johnson Mesa Road on ridge south of Canovas Canyon, a tributary of Gallinas Creek, about 12.5 mi northwest of Las Vegas, near center sec. 23, T. 17 N., R. 14 E., San Miguel Co., NM, Las Vegas-Raton basin. Named from exposures in hogbacks near El Porvenir Campground (Baltz and Myers, 1984).
Principal reference locality (a composite of measured sections): from near San Isidro Cemetery, along Highway 94, across Canondel Horno and west along ridge south of that canyon, San Miguel Co., NM (Baltz and Myers, 1984).
Reference section: a short distance north of Highway 3, northwest and northeast of St. Joseph Church, Mora Co., NM (Baltz and Myers, 1999).
AAPG geologic province:
Las Vegas-Raton basin*
Palo Duro 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 ([ ]).