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Geologic Unit: Pescadero
Map showing publication footprint
  • Usage in publication:
    • Pescadero Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Rhyolite
  • AAPG geologic province:
    • Basin-and-Range province
Publication:

Heindl, L.A., 1965, Mesozoic formations in the Comobabi and Roskruge Mountains, Papago Indian Reservation, Arizona, IN Contributions to stratigraphy: U.S. Geological Survey Bulletin, 1194-H, p. H1-H15.


Summary:

Named as member of the newly named Roskruge Rhyolite. Type locality is along a general northeast-trending line through Pescadero Mountains, Roskruge Mountains, Pima Co, AZ, Basin-and-Range province. Is made up of pyroclastic rocks, dominantly of rhyolite flows. Intertongues laterally with Dobbs Buttes Member (newly named), which is made up dominantly of pyroclastic rocks. Is Mesozoic. Probably is Late Cretaceous. Geologic map.

Source: GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Pescadero Member*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Basin-and-Range province
Publication:

Hayes, P.T., 1970, Cretaceous paleogeography of southeastern Arizona and adjacent areas, IN Mesozoic stratigraphy in southeastern Arizona: U.S. Geological Survey Professional Paper, 658-B, p. B1-B42. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp658B]


Summary:

The age of Roskruge Rhyolite (of which Pescadero is a member) is refined to Late Cretaceous.

Source: GNU records (USGS DDS-6; Denver 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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