Usage:
No current usage.
(†Rio Blanco Formation (PR) abandoned.)
Geologic age:
Late Cretaceous
Type section, locality, area and/or origin of name:
Type area: exposures along Route 109, the Rio Anasco, and from Quebrada Alto Sana (Puerto Rico Meter Grid System 88,700 E.; 51,300 N.) to about 200 m west of Quebrada Cerro Gordo (85,000 E.; 50,200 N.), San Sebastsion quadrangle, northwestern Puerto Rico (McIntyre and others, 1970).
Named from exposures along Rio Blanco, Lares district, northwestern Puerto Rico (US geologic names lexicon, USGS Bull. 1200).
AAPG geologic province:
Caribbean region
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 ([ ]).