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National Geologic Map Database

Geologic Unit: Perchas

Usage:

Perchas Formation of Rio Orocovis Group (PR*)


Geologic age:

Cretaceous*


Type section, locality, area and/or origin of name:

Type area: extends along the Morovis-Orocovis Highway from locality 6 in Barrio Gato northward to a locality 7 just south of the Rio Grande de Manati, Ciales quadrangle, Puerto Rico. Named from outcrops along banks of highway that crosses Quebrada Perchas in Barrio Pesas, Municipio de Morovis (Berryhill, 1965, see pl. 1).


AAPG geologic province:

Caribbean region*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).