- Usage in publication:
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- Martin Gonzalez Lava Member*
- Modifications:
-
- Named
- Dominant lithology:
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- Lava
Summary:
The Martin Gonzalez Lava Member of the Guaynabo Formation, here named, lies about midway between the base of the formation and the Leprocomio Siltstone Member at the top. It resembles the Mamey Lava Member of the Camarones Sandstone in texture and composition and is correlated with it. Consists of greenish-gray porphyritic lava with plagioclase phenocrysts. Thickness at type locality is 400 m. Age is Late Cretaceous (Santonian or younger).
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Martin Gonzalez Lava*
- Modifications:
-
- Revised
Summary:
The Guaynabo Formation as used by Pease (1968) in the Aguas Buenas quadrangle to include both the Guaynabo and Frailes of Kaye (1959), is here revised in the Gurabo quadrangle. The name is not used and it is divided into several formations. The name Frailes is retained to describe beds continuous with beds at the type locality. Martin Gonzalez Lava Member of the Guaynabo is here raised to Martin Gonzalez Lava at formation rank. The Leprocomio Siltstone Member of the Guaynabo is here revised to Leprocomio Mudstone Member of the Frailes Formation.
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 ([ ]).