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National Geologic Map Database
Geologic Unit: Melones
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Map showing publication footprint
  • Usage in publication:
    • Melones Limestone*
  • Modifications:
    • Revised
Publication:

Volckmann, R.P., 1984, Upper Cretaceous stratigraphy of southwest Puerto Rico; a revision, IN Stratigraphic notes, 1983: U.S. Geological Survey Bulletin, 1537-A, p. A73-A83.


Summary:

The name Mayaguez Group is abandoned because it is no longer valid in the sense in which it was originally defined by Mattson (1960). His Mayaguez contained 7 lithofacies: the Parguera Limestone, here revised; the Brujo Limestone, here abandoned because it is identical to the Cotui Limestone; Melones Limestone, revised; the Yauco Mudstone, revised; the Sabana Grande Andesite, revised; El Rayo Volcanics, revised; and Maricao Basalt, not discussed. The El Rayo Volcanics are not within the Mayaguez but overlie rocks assigned by Mattson to the San German Formation, which does not overlie the Mayaguez, but is equivalent to part of the Mayaguez.

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


Map showing publication footprint
  • Usage in publication:
    • Melones Limestone*
  • 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 Melones Limestone occurs in southwestern Puerto Rico and consists of volcanic sandstone interbedded with shaly limestone, calcareous mudstone, and carbonaceous limestone. Estimated thickness is 300 meters. The Melones 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 ([ ]).