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Map showing publication footprint
  • Usage in publication:
    • Spiral Butte Andesite
  • Modifications:
    • Named
  • Dominant lithology:
    • Andesite
  • AAPG geologic province:
    • Cascades province
Publication:

Ellingson, J.A., 1972, The rocks and structure of the White Pass area, Washington: Northwest Science, v. 46, no. 1, p. 9-24.


Summary:

Crops out on both sides of White Pass HWY from summit to 3 mi east of Spiral Butte and on west and northwest of Tumac Plateau, Yakima Co, WA. Consists of dense, light-gray lava with strong linear flow-banding which gives rock characteristic platy rock cleavage. Geologic sketch map and structure section show Spiral Butte Andesite unconformably overlies Russell Ranch Formation. Age given as Quaternary.

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


Map showing publication footprint
  • Usage in publication:
    • Spiral Butte Andesite
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Cascades province
Publication:

Hammond, P.E., Bentley, R.D., Brown, J.C., and Ellingson, J.A., 1977, Volcanic stratigraphy and structure of the southern Cascade Range, Washington; Field trip no. 4, IN Brown, E.H., and Ellis, R.C., eds., Geological excursions in the Pacific northwest: Geological Society of America [Guidebook for Field Trips], [90th] annual meeting, Seattle, WA, November 7-9, 1977, p. 127-169.


Summary:

Described as light-gray, platy, flow-layered hypersthene-hornblende-augite andesite lava flows and minor breccia. Erupted from several vents, the youngest being Spiral Butte. Age given as Pliocene to 10,000(?) yr B.P.

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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