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Map showing publication footprint
  • Usage in publication:
    • Cambalache Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Breccia
    • Andesite
    • Sandstone
    • Mudstone
  • AAPG geologic province:
    • Caribbean region
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. Conformably overlies the Hato Puerco Formation; sharply and conformably underlies the Canovanas Formation. Thickness averages 350 to 450 m, up to 600 m. Age is Late Cretaceous (Turonian) based on fossils.

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


Map showing publication footprint
  • Usage in publication:
    • Cambalache 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 Cambalache Formation occurs in eastern Puerto Rico and consists of pumiceous volcanic breccia, sandstone, mudstone, and locally, welded ash-flow tuff. Maximum thickness is 600 meters but is typically 350 to 450 meters. The Cambalache 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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