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

Nelson, A.E., and Monroe, W.H., 1966, Geology of the Florida quadrangle, Puerto Rico, IN Contributions to general geology, 1965: U.S. Geological Survey Bulletin, 1221-C, p. C1-C22.


Summary:

The Tetuan Formation, here named, consists of bedded, fine-grained, greenish-gray to olive-green volcanic breccia, lapilli tuff, and lava. Conformably overlies the Mameyes Formation with the contact at the uppermost lava unit of the Mameyes and the lowermost volcanic sandstone unit of the Tetuan; conformably underlies the Alonso Formation with the contact at the upper most thin-bedded tuff of the Tetuan under massive red volcanic breccia of the Alonso. Thickness is 1,200 to 1,500 m. Age is Late Cretaceous (Santonian to Campanian) based on a fragmentary ammonite.

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


Map showing publication footprint
  • Usage in publication:
    • Tetuan Formation*
  • 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 Tetuan Formation occurs in central Puerto Rico and consists of pumiceous tuff, volcanic breccia, and pillowed andesitic lava flows. Maximum estimated thickness is 1500 meters. The Tetuan 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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