Usage:
Guaynabo Formation (PR*)
Subunits:
Martin Gonzalez Lava Member*, Leprocomio Siltstone Member (PR*)
Geologic age:
Late Cretaceous (Cenomanian to Campanian)*
Type section, locality, area and/or origin of name:
[Principal reference section]: Valley of the Rio Piedras (Puerto Rico Meter Grid System 191,000 E.; 56,130 N. to 191,500 E.; 59,400 N.), Aguas Buenas quadrangle, northeastern Puerto Rico (Pease, 1968).
Named from town of Guaynabo, northwestern Fajardo district, Fajardo quadrangle, northeastern Puerto Rico (Meyerhoff and Smith, 1931).
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 ([ ]).