- Usage in publication:
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- Augustinillo formation
- Modifications:
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- Named
- Dominant lithology:
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- Limestone
Summary:
Augustinillo formation named in Jacaguas group. Consists of 17,000 ft of marine sediments. Includes the Collores member to the east and the Monserrate member to the west. Interfingers with the Naranjo formation, and may interfinger with the Rio Culebrinas formation to the west.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Augustinillo Formation
- Modifications:
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- Not used
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 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, Cuevas, Guayo, Rio Descalabrado. A disconformity exists between the Raspaldo and Cuevas Formations. Jacaguas Group unconformably overlies the Coamo Formation; unconformably underlies the Juana Diaz Formation. Age of the Jacaguas is Late Cretaceous (Maastrichtian) to middle Eocene.
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 ([ ]).