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Geologic Unit: Guayo
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Map showing publication footprint
  • Usage in publication:
    • Guayo conglomeratic sandstone member
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Conglomerate
  • AAPG geologic province:
    • Caribbean region
Publication:

Pessagno, E.A., Jr., 1960, Geology of the Ponce-Coamo area, Puerto Rico: Puerto Rico Economic Development Administration, p. 94-103., Prepared in cooperation with Princeton Univ. Dept. Geol


Summary:

The Jacaguas group is here named. Includes the intertonguing Augustinillo formation and its Collores and Monserrate members and Naranjo formation and its Miramar, Coamo Springs limestone, Rio Descalabrado, and Guayo conglomeratic sandstone members.

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


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

Glover, Lynn, III, and Mattson, P.H., 1967, The Jacaguas Group in central-southern Puerto Rico, IN Hayes, P.T., Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1966: U.S. Geological Survey Bulletin, 1254-A, p. A29-A39.


Summary:

The Jacaguas Group of Pessagno (1960a) is here adopted, as well as the Miramar, Guayo, and Rio Descalabrado Members of the Naranjo Formation of Pessagno (1960a) and the Los Puertos Member of the Naranjo of Pessagno (1960b). The Naranjo Formation and its Coamo Springs Limestone Member and the Augustinillo Formation and its Collores and Monserrate Members are not adopted or discussed. The Raspaldo Formation is here named in the Jacaguas and the Cuevas Limestone of Glover (1961) is assigned to the Jacaguas. Formations are, in ascending order: Miramar, Los Puertos, Raspaldo, disconformity, Cuevas, Guayo, Rio Descalabrado. Unconformably overlies the Coamo Formation; unconformably underlies the Juana Diaz Formation. Age is Late Cretaceous (Maastrichtian) to middle Eocene. Guayo Formation may interfinger with rocks of the Rio Descalabrado and age is estimated as early middle Eocene.

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


Map showing publication footprint
  • Usage in publication:
    • Guayo 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 Guayo Formation occurs in southwestern Puerto Rico and consists of conglomerate, subordinate sandstone and siltstone. Boulders are abundant (lithologically like volcanic rocks of the Coamo, Maravillas, Lago Garzas, and Anon Formations, and limestone of the Cuevas Limestone). The Guayo fills channels in the Cuevas Limestone and Rio Descalabrado Formation. Maximum estimated thickness is 200 meters. The Guayo is of Eocene age and possibly younger.

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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