- Usage in publication:
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- Palma Escrita Formation*
- Modifications:
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- Named
- Dominant lithology:
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- Volcaniclastics
Summary:
Palma Escrita Formation, here named, consists of pumice-rich dacitic to rhyodacitic volcaniclastic rocks in Central la Plata and Maricao quads. Locally interbedded are lavas of probable basaltic composition. Thickness ranges from 800 m near Cerro Gordo to 2,200 m to northeast. These rocks were formerly assigned to the Concepcion Formation. Is in fault or unconformable contact with older units. Concordantly and conformably underlies the Mal Paso Formation. Age is probably no older than Eocene based on early middle Eocene age of Mal Paso.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Palma Escrita Formationâ€
- Modifications:
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- Abandoned
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.
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 ([ ]).