Biotitic Meta-Sandstone in the Gunsight Formation

Image: Biotitic Meta-Sandstone in the Gunsight Formation

Detailed Description

Outcrop of biotitic meta-sandstone in the lower part of the Gunsight Formation, cut by white quartz veins with alteration envelopes of coarsely crystalline black biotite and minor muscovite. USGS intern, Shane Kostka prepares to collect representative samples from this outcrop.

Details

Image Dimensions: 4896 x 3672

Date Taken:

Location Taken: Salmon, ID, US