The National Geologic Map Database is migrating to a new infrastructure. We apologize for any service disruptions during this process.

U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Marblemount quartz diorite
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Quartz diorite
  • AAPG geologic province:
    • Northern Cascade Range-Okanagan province
Publication:

Misch, Peter, 1952, Geology of the northern Cascades of Washington: The Mountaineer, v. 45, no. 12, p. 4-22.


Summary:

Pg. 4 (geol. map). Marblemount quartz diorite. Sheared and partly metamorphosed to chloritic schist. Earlier than Mesozoic folding. Older than Skagit gneisses. Age is pre-Mesozoic.
Marblemount is in Skagit Co., northwestern WA.

Source: US geologic names lexicon (USGS Bull. 1200, p. 2373).


Map showing publication footprint
  • Usage in publication:
    • Marblemount meta-quartz diorite
    • Marblemount Belt quartz diorite gneiss
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Northern Cascade Range-Okanagan province
Publication:

Laursen, J.M., and Hammond, P.E., 1974, Summary of radiometric ages of Oregon and Washington rocks through June, 1972: Isochron/West, no. 9, 32 p.


Summary:

Pg. 10. Marblemount meta-quartz diorite; Marblemount Belt quartz diorite gneiss. Samples from Skagit and Chelan Counties, northwestern Washington. U-Pb ages range from 243 to 215 Ma (zircon). [Age is Triassic.]

Source: GNC index card files (USGS-Menlo).


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 21 May 2026 06:18:24 PM MDT