- Usage in publication:
-
- Pastillo Member*
- Modifications:
-
- Named
- Dominant lithology:
-
- Lava
- Andesite
Summary:
The Pastillo Member is here named the lower member of the Lago Garzas Formation. Consists of thick-bedded to massive volcanic breccia and lava. Interbedded with overlying Santas Pascuas Member. Thickness is at least 1,000 m. Age is Late Cretaceous (Campanian? to Maastrichtian).
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Pastillo Member*
- Modifications:
-
- Age modified
- Overview
Summary:
Interbedded lithofacies of the Anon and Lago Garzas are not given separate formation names. Therefore the Santas Pascuas Member of the Lago Garzas is abandoned and considered to be a lithofacies of the Anon. The Mal Paso and Palma Escrita Formations are abandoned and are considered to be interbedded facies of the Anon and Lago Garzas. The Pastillo Member of the Lago Garzas is retained. It consists of dark-red-purple-brown augite andesite lava and breccia. Age is Late Cretaceous (Campanian and Maastrichtian) through 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 ([ ]).