Usage:
Matilde Formation (PR*)
Geologic age:
Tertiary*
Eocene, middle*
Type section, locality, area and/or origin of name:
Type section: about 0.5 km northwest of Matilde, along a dirt road (Puerto Rico Meter Grid System 108,520 E.; 48,680 N. to 108,660 E.; 48,780 N.), Bayaney quadrangle, north-central Puerto Rico (Nelson and Tobisch, 1967).
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 ([ ]).