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Geologic Unit: Lares
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Map showing publication footprint
  • Usage in publication:
    • Lares limestone*
  • Modifications:
    • Revised
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Caribbean region
Publication:

Maury, C.J., 1919, On the correlation of Porto Rican Tertiary formations with other Antillean and mainland horizons: American Journal of Science, 4th series, v. 48, no. 285, p. 209-215.


Summary:

Aguadilla limestone shown on correlation chart as subdivision of Arecibo formation. Overlies Lares limestone, underlies Quebradillas limestone. Age is Oligocene. Maury (1919b) changed age to early Miocene.

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


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

Zapp, A.D., Bergquist, H.R., and Thomas, C.R., 1948, Tertiary geology of the coastal plains of Puerto Rico: U.S. Geological Survey Oil and Gas Investigations Map, OM-85, 1 sheet, p. 52-54, scale 1:60,000


Summary:

Sediments ranging from coarse bouldery gravel through sand, silt, clay, and marl to pure limestone, characterized by rapid lateral changes in lithology and intergrading both horizontally and vertically, are named the Rio Guatemala group. The San Sebastian formation represents the first interval of clastic deposition; the Lares limestone represents biohermal areas; and the Cibao marl with its Guajataca member represents the second interval of clastic deposition. Maximum thickness is 700 m. Unconformably overlies rocks of Late Cretaceous age; conformably underlies Aguada limestone. Age is Tertiary.

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


Map showing publication footprint
  • Usage in publication:
    • Lares 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 Lares Limestone occurs on the north coast of Puerto Rico and consists of calcilutite, locally, and hard calcilutite interbedded with chalky limestone and calcareous clay. Maximum estimated thickness is 270 meters. The Lares is of late(?) Oligocene age.

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


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