- Usage in publication:
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- Lapa lava member*
- Modifications:
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- Named
- Dominant lithology:
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- Andesite
- Lava
Summary:
The Lapa Lava Member of the Robles Formation, here named, consists of two basaltic andesite flows with pillow lavas. Flows are in the lower part of the Robles and are locally separated by a tongue of the Cayey Siltstone Member of the Robles. Maximum thickness is 350 m. Age is Late Cretaceous or older.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Lapa lava member*
- Modifications:
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- Overview
Summary:
The Robles Formation is here named in the Comerio quadrangle where it includes the Rio Maton Limestone, Lapa Lava, and Las Tetas Lava Members of Berryhill and Glover (1960). Consists of well-bedded sandstone and siltstone with thin lava flows and breccias. Conformably overlies informal formation K. Maximum thickness is 1,200 m. Age is early to middle Late Cretaceous.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Lapa Andesite Member*
- Modifications:
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- Revised
Summary:
Robles Formation is here subdivided into 3 members in the Barranquitas quadrangle: the basal Barranquitas Tuff Member, the Lapa Andesite Member, and the Helechal Tuff Member at the top.
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 ([ ]).