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Geologic Unit: Barros
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  • Usage in publication:
    • Barros Tuff Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Tuff
    • Breccia
    • Sandstone
    • Siltstone
  • AAPG geologic province:
    • Caribbean region
Publication:

Briggs, R.P., 1969, Changes in stratigraphic nomenclature in the Cretaceous System, east-central Puerto Rico, IN Contributions to stratigraphy, 1968: U.S. Geological Survey Bulletin, 1274-O, p. O1-O31., Prepared in cooperation with the Commonwealth of Puerto Rico Economic Development Administration


Summary:

The Barros Tuff Member of the Torrecilla Breccia, here named, consists of moderately weathered, thick-bedded, coarse, yellowish- to reddish-brown tuff and fine breccia interlayered with thin-bedded tuffaceous sandstone and siltstone. Gradationally underlies the Robles Formation. Thickness is 80 to 100 m at type section, and ranges from 0 to 120 m. Age is Albian.

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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