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Map showing publication footprint
  • Usage in publication:
    • Naranjito Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Tuff
    • Mudstone
  • AAPG geologic province:
    • Caribbean region
Publication:

Pease, M.H., Jr., 1968, Cretaceous and lower Tertiary stratigraphy of the Naranjito and Aguas Buenas quadrangles and adjacent areas, Puerto Rico: U.S. Geological Survey Bulletin, 1253, 57 p.


Summary:

The Naranjito Formation, here named, consists of thick-bedded tuff and tuffaceous mudstone in a narrow faulted graben; stratigraphically equivalent to the Guaracanal Andesite. Top and bottom cut out by faults. Thickness is 300 m. Age is Paleocene based on equivalence to the Guaracanal.

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


Map showing publication footprint
  • Usage in publication:
    • Naranjito Formation*
  • Modifications:
    • Age modified
  • 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 Naranjito Formation occurs in eastern Puerto Rico and consists of crystal-tuff, tuffaceous breccia and conglomerate, volcanic sandstone, and locally, lava flows. Maximum thickness is 450 meters. The age of the Naranjito Formation is changed to Late Cretaceous(?) and early Paleogene(?).

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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