Usage:
La Muda Formation (PR*)
Geologic age:
Late Cretaceous (Maastrichtian)*
Type section, locality, area and/or origin of name:
Type section: quarry (Puerto Rico Meter Grid System 189,120 E.; 53,710 N. to 188,970 E.; 53,690 N.), just north of Highway 1 and east of the type section of the Tortugas Andesite, near La Muda, San Juan area, San Juan quadrangle, northeastern Puerto Rico (Pease, 1968).
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 ([ ]).