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Geologic Unit: Toyosa
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  • Usage in publication:
    • Toyosa Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Siltstone
Publication:

Briggs, R.P., 1969, Changes in stratigraphic nomenclature in the Cretaceous System, east-central Puerto Rico, IN Contributions to stratigraphy, 1968: U.S. Geological Survey Bulletin, 1274-O, p. O1-O31., Prepared in cooperation with the Commonwealth of Puerto Rico Economic Development Administration


Summary:

In the Orocovis quadrangle the Maravillas includes the Sabana Hoya, San Diego (which forms the bulk of the Maravillas in this quadrangle), and Toyosa Members. The name Toyosa is applied to beds correlated with the Santa Ana Limestone Member elsewhere. Toyosa consists of calcareous, tuffaceous sandstone and siltstone. Overlies the San Diego Member; conformably underlies the Coamo Formation. Thickness is up to 350 m. Age is Campanian and possibly Maastrichtian.

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 ([ ]).

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