- Usage in publication:
-
- Guajataca member*
- Modifications:
-
- Named
- Dominant lithology:
-
- Gravel
- Sand
- Silt
- Clay
- Marl
- Limestone
- AAPG geologic province:
-
- Caribbean region
Summary:
Sediments ranging from coarse bouldery gravel through sand, silt, clay, and marl to pure limestone, characterized by rapid lateral changes in lithology and intergrading both horizontally and vertically, are named the Rio Guatemala group. The San Sebastian formation represents the first interval of clastic deposition; the Lares limestone represents biohermal areas; and the Cibao marl with its Guajataca member (here named) represents the second interval of clastic deposition. Maximum thickness is 700 m. Unconformably overlies rocks of Late Cretaceous age; conformably underlies Aguada limestone. Age is Tertiary.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Guajataca Member*
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Caribbean region
Summary:
The Guajataca Member of the Cibao Formation occurs on the north coast of Puerto Rico and consists of calcareous clay, chalky limestone, and marl with massive lenses of sand and gravel.
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 ([ ]).