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Geologic Units: Rumsey
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  • Usage in publication:
    • Rumsey Formation
  • Modifications:
    • Named
  • AAPG geologic province:
    • Sacramento basin
Publication:

Ingersoll, R.V., Rich, E.E., and Dickinson, W.R., 1977, Field guide; Great Valley Sequence, Sacramento Valley; [Field trip no. 8]: Geological Society of America, Cordilleran Section, Guidebook for Field Trips, 73rd annual meeting, Sacramento, CA, April 5-7, 1977, 72 p.


Summary:

Unit is named the Rumsey Formation. Includes Guinda Sandstone Member in the basal part of the unit. Consists of massive to well-bedded, fine- and medium-grained gray concretionary sandstone and laminated gray siltstone and shale. Contains felsic plutonic detritus deposited in a deep-marine trough. Thickness at type is 915 m; ranges from 365 to 1220 m. Overlies the Cortina Formation; unconformably underlies Tertiary or Quaternary rocks. Age is Late Cretaceous. [Violates Article 13 (insufficient publication) of 1970 NASC] (B1564)

Source: GNU records (USGS DDS-6; Menlo 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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