USGS Visual Identifier

GEOLEX

Summary of Citation: Hacienda Larga

Publication:
Glover, Lynn, III, 1961, Preliminary report on the geology of
   the Coamo Quadrangle, Puerto Rico: U.S. Geological Survey
   Miscellaneous Investigations Series Map, I-335, 1 sheet,
   scale 1:20,000
Usage in Publication:
Hacienda Larga Tuff Member*

Modifications: Geologic Province: Dominant Lithology:
 Named
  Caribbean region
  Tuff

Summary:
The Cariblanco Formation, here named, consists of thin- to medium-bedded siltstone and sandstone that intertongues with massive conglomerate. Units of limestone, tuff, and lava in the formation are named, in order of decreasing age, the La Guaba Lava Member, the Hacienda Larga Tuff Member, the Jobo Dulce Limestone Member, the Pio Juan Limestone Member, and the Sabana Hoyos Limestone Member. Overlies the Robles Formation; underlies the Coamo Formation. Age is Late Cretaceous. The Hacienda Larga Member is indurated, massive to thick-bedded volcanic ash 100 m above the base of the Cariblanco.
Summary of Citation: Hacienda Larga

Publication:
Glover, Lynn, III, 1971, Geology of the Coamo area, Puerto Rico,
   and its relation to the volcanic arc-trench association: U.S.
   Geological Survey Professional Paper, 636, 102 p.
Usage in Publication:
Hacienda Larga Tuff Member*

Modifications: Geologic Province: Dominant Lithology:
 Revised
  Caribbean region
  

Summary:
The uppermost Sabana Hoyos Limestone Member is here removed from the Cariblanco Formation and is included as a member of the overlying Maravillas Formation. In the Coamo area the Cariblanco includes the La Guaba Lava Member near the base and the Jobo Dulce and Pio Juan Limestone Members in the upper part. The Hacienda Larga Tuff Member originally named in the Coamo quadrangle in the belief that it was a unique isochronous rock unit, has been shown to be merely a rather pure accumulation of a crystal tuff component of the matrix. Specific correlation of the crystal tuff mapped at Hacienda Larga south of the Rio Cuyon with the Hacienda Larga Member mapped north of the Rio Cuyon is not implied.