- Usage in publication:
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- Vista Alegre Formation*
- Modifications:
-
- Named
- Dominant lithology:
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- Sandstone
- Siltstone
- Tuff
- Lava
- AAPG geologic province:
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- Caribbean region
Summary:
The Vista Alegre Formation, here named, consists of volcanic sandstone and subordinate siltstone and tuff and lava beds. Lower part of unit is not present in the Florida quadrangle, but is exposed in adjacent Jayuya quadrangle, where it conformably overlies the Robles Formation. Conformably underlies the Mameyes Formation with the contact at the lowest lava of the Mameyes. Thickness is at least 500 m. Age is Early(?) to Late Cretaceous.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Vista Alegre Formation*
- Modifications:
-
- Principal reference
- AAPG geologic province:
-
- Caribbean region
Summary:
Reference locality: West bank of Rio Toro Negro on Route 149, 43,020 N.; 143,530 E. to 44,510 N.; 142,870 E., Jayuya quad.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Vista Alegre Formation*
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Caribbean region
Summary:
The Vista Alegre Formation occurs in central Puerto Rico and consists of graded volcanic sandstone, crystal and lithic tuff, siltstone, volcanic breccia, pillowed andesitic and basaltic lava, and basaltic tuff. Maximum estimated thickness is 1700 meters. The Vista Alegre is of Late(?) Cretaceous age.
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 ([ ]).