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Geologic Unit: Collao
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  • Usage in publication:
    • Collao member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Siltstone
    • Sandstone
    • Conglomerate
  • AAPG geologic province:
    • Caribbean region
Publication:

Berryhill, H.L., Jr., and Glover, Lynn, III, 1960, Geology of the Cayey quadrangle, Puerto Rico: U.S. Geological Survey Miscellaneous Investigations Series Map, I-319, 1 sheet, scale 1:20,000


Summary:

The Collao Member of the Robles Formation, here named, consists of laminated siltstone and sandstone and conglomerate lenses. Overlies the Las Tetas Lava Member of the Robles; is the uppermost member. Maximum thickness is 200 m. Late Cretaceous.

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 ([ ]).

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