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Geologic Unit: Lummi
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  • Usage in publication:
    • Lummi Formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Graywacke
    • Siltstone
    • Shale
  • AAPG geologic province:
    • Puget Sound province
Publication:

Vance, J.A., 1975, Bedrock geology of San Juan County, IN Russel, R.H., ed., Geology and Water Resources of the San Juan Islands, San Juan County, Washington: Washington Department of Ecology Water-Supply Bulletin, no. 46, p. 3-19, (incl. geologic map, scale 1:63,360)


Summary:

Lummi Formation. Consists of gray, brown, and black interbedded graywacke, shale, and siltstone [well-stratified turbidites]. Thickness at type is 1800 m; ranges from 900 to 1800 m. Overlies the Constitution Formation. Age is Cretaceous(?). (B1520)

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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