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  • Usage in publication:
    • Helechal Tuff Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Tuff
  • AAPG geologic province:
    • Caribbean region
Publication:

Otalora, G., 1964, Zeolites and related minerals in Cretaceous rocks of east-central Puerto Rico: American Journal of Science, v. 262, no. 6, p. 726-734.


Summary:

Robles Formation is here subdivided into 3 members in the Barranquitas quadrangle: the basal Barranquitas Tuff Member, the Lapa Andesite Member, and the Helechal Tuff Member at the top.

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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