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Geologic Unit: Cotorra
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Map showing publication footprint
  • Usage in publication:
    • Cotorra Tuff*
  • Modifications:
    • Named
  • Dominant lithology:
    • Tuff
    • Breccia
  • AAPG geologic province:
    • Caribbean region
Publication:

Briggs, R.P., 1967, The Malo Breccia and Cotorra Tuff in the Cretaceous of central Puerto Rico, IN Hayes, P.T., Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1966: U.S. Geological Survey Bulletin, 1254-A, p. A23-A29.


Summary:

The Cotorra Tuff, here named, consists of massive, basaltic, dark-green to bluish-black crystal-vitric tuff and tuff breccia. Rests on Malo Breccia and may be contemporaneous with upper part of the Malo; conformably underlies volcanic conglomerate that is a lateral equivalent of the Cariblanco Formation. Thickness ranges from 0 to 500 m, thins to the north suggesting that it was obstructed by the Malo. Marine origin suggested by presence of pillows. Age is Late Cretaceous (Santonian) based on correlation with the Malo and Robles.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Cotorra Tuff*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Caribbean region
Publication:

Krushensky, R.K., 2001, Geologic map of Puerto Rico with correlation chart and map unit descriptions, IN Bawiec, W.J., and others, Geology, geochemistry, geophysics, mineral ccurrences, and mineral resource assessment for the Commonwealth of Puerto Rico: U.S. Geological Survey Open-File Report, OF-98-38, scale 1:100,000


Summary:

The Cotorra Tuff occurs in central Puerto Rico and consists of basaltic hyaloclastite-breccia with pillowed basalt flows at the base and top. Maximum estimated thickness is 500 meters. The Cotorra 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 ([ ]).

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