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Geologic Unit: Cajul
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Map showing publication footprint
  • Usage in publication:
    • Cajul Volcanic Rocks
  • Modifications:
    • Named
  • Dominant lithology:
    • Basalt
  • AAPG geologic province:
    • Caribbean region
Publication:

Mattson, P.H., 1973, Middle Cretaceous nappe structures in Puerto Rican ophiolites and their relation to the tectonic history of the Greater Antilles: Geological Society of America Bulletin, v. 84, no. 1, p. 21-38.


Summary:

Cajul Volcanic Rocks of the Bermeja Complex, here named, consist of finely crystalline greenish basalt lava with pillows. Intruded by the Maguayo Porphyry. Age is pre-middle Cretaceous.

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


Map showing publication footprint
  • Usage in publication:
    • Cajul Basalt*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Caribbean region
Publication:

Volckmann, R.P., 1984, Geologic map of the Puerto Real quadrangle, southwest Puerto Rico: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1559, 1 sheet, scale 1:20,000


Summary:

The Cajul Volcanic Rocks of Mattson (1973) is here revised as the Cajul Basalt to more accurately depict their nature. The Cajul is entirely basalt and is interbedded with the Mariquita Chert, whose age is Late Jurassic to Early Cretaceous (Tithonian to Aptian) based on Radiolaria.

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


Map showing publication footprint
  • Usage in publication:
    • Cajul Basalt*
  • 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 Cajul Basalt occurs in southwestern Puerto Rico and consists of dark purplish-red amygdaloidal, pillowed, porphyritic basalt flows with phenocrysts of plagioclase and olivine. Thickness unknown. The Cajul is of Late Jurassic(?) and Early Cretaceous(?) age.

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


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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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