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  • Usage in publication:
    • Toma de Agua Vitrophyre Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Pumice
Publication:

Seiders, V.M., 1971, Cretaceous and lower Tertiary stratigraphy of the Gurabo and El Yunque quadrangles, Puerto Rico, IN Contributions to stratigraphy, 1969: U.S. Geological Survey Bulletin, 1294-F, p. F1-F58.


Summary:

The Cambalache Formation, here named, consists of andesitic volcanic breccia, sandstone, and mudstone characterized by altered pumice and perlite. Includes the Toma de Agua Vitrophyre Member, 0 to 50 m thick, at the top of the formation. Vitrophyre is black, vitreous, with columnar jointing. Cambalache conformably overlies the Hato Puerco Formation; sharply and conformably underlies the Canovanas Formation. Age is Late Cretaceous (Turonian) based on fossils.

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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