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Granite Augen Gneiss

Detailed Description

Mesoproterozoic granite augen gneiss at Napias Creek, east-central Idaho. Cover image from USGS Data Series 942.


Public Domain.

USGS Data Series 942
du Bray, E.A., Holm-Denoma, C.S., San Juan, C.A., Lund, Karen, Premo, W.R., and DeWitt, Ed, 2015, Geochemical, modal, and geochronologic data for 1.4 Ga A-type granitoid intrusions of the conterminous United States: U.S. Geological Survey Data Series 942, 19 p.,