- Usage in publication:
-
- Rio Chiquito formation
- Modifications:
-
- Named
- Dominant lithology:
-
- Andesite
- Limestone
Summary:
The Rio Chiquito Formation consists of unknown thickness of pyroclastics alternating with andesite flows. Locally contains lenses of limestone that correlate lithologically with massive limestones of Mattson's (1960) San German formation. Relationship of Rio Chiquito with Rio Yauco formation to west not precisely known. Cover of Oligocene and younger sediments obscures relationship of the Rio Chiquito with other Cretaceous rocks to east. Unit is intruded by Tibes diorite.
Source: GNU records (USGS DDS-6; Reston GNULEX).
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 ([ ]).