U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Strawberry volcanics*
  • Modifications:
    • Named
  • Dominant lithology:
    • Volcanics
  • AAPG geologic province:
    • Blue Mountains province
    • Columbia basin
Publication:

Thayer, T.P., 1957, Some relations of later Tertiary volcanology and structures in eastern Oregon, IN Vulcanologia del Cenozoico; Section 1: International Geological Congress, 20th, Report, Mexico City, 1956, no. 1, p. 231-245.


Summary:

Named for rocks in Strawberry Mountain. Type locality designated as exposures in higher parts of Strawberry Mountain between Indian Creek and John Day faults [Strawberry Mountain 7.5' quad] Grant Co, OR. Includes in lower part Slide Creek member (new) characterized as Columbia River type flows. Upper part consists of pale-gray, fresh basaltic to andesitic hypersthene-bearing lava which is 6500 ft thick on northern slopes of Strawberry Mountain. Lower part consists of thick rhyolite flows and dense platy andesites. Around north and west sides of Unity Basin underlies Ironside formation. Unconformably underlies Rattlesnake formation. Age of upper part believed to be middle and late Miocene and lower part Eocene to early Miocene [based on stratigraphic relations].

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


Map showing publication footprint
  • Usage in publication:
    • Strawberry Volcanics*
  • Modifications:
    • Revised
    • Age modified
  • AAPG geologic province:
    • Blue Mountains province
    • Columbia basin
Publication:

Thayer, T.P., Case, J.E., and Stotelmeyer, R.B., 1981, Mineral resources of the Strawberry Mountain Wilderness and adjacent areas, Grant County, Oregon: U.S. Geological Survey Bulletin, 1498, 67 p., (incl. geologic map, scale 1:62,500)


Summary:

Strawberry Volcanics includes Slide Creek Member (olivine basalt flows extending across northern face of Strawberry Mountain) and new member, Wildcat Basin Rhyolite Member (extending southwestward from vent complex in head of Indian Creek just north of Wildcat Basin). Strawberry Volcanics overlies Clarno Formation. Age given as Miocene and Pliocene.

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


Map showing publication footprint
  • Usage in publication:
    • Strawberry Volcanics*
  • Modifications:
    • Age modified
    • Geochronologic dating
  • AAPG geologic province:
    • Blue Mountains province
    • Columbia basin
Publication:

Walker, G.W., 1990, Miocene and younger rocks of the Blue Mountains region, exclusive of the Columbia River Basalt Group and associated mafic lava flows: U.S. Geological Survey Professional Paper, 1437, p. 101-118.


Summary:

Age of Strawberry Volcanics is middle and late Miocene on basis of K-Ar ages ranging [overall] from 20 to about 10 Ma for unit.

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


Search archives

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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 04:17:43 PM MDT