File:Fault in Archean gneiss & Cretaceous granodiorite (Norris South roadcut, Madison County, Montana, USA) 2 (31675249148).jpg

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Faults are common in orogenic belts throughout the world. Faults are fractures or fracture systems in rocks along which there has bee differential displacement. Dip-slip faults involve movement in non-horizontal directions. Examples include normal faults and reverse faults. Strike-slip faults involve horizontal movement of rocks.

Geologic units & age: fault in units Agg & Kgd of Kellogg (1994); Agg = plagioclase-microcline-quartz-biotite gneiss, Archean, probably 3.1 to 3.2 Ga (= age of peak metamorphism during intrusion of Spanish Peaks area trondhjemites and tonalites); Kgd = granodiorite of the Tobacco Root Batholith, Late Cretaceous, 71 to 74 Ma

Locality: roadcut on the eastern side of Route 287, Burnt Creek-Bradley Creek Valley, south of the town of Norris, northern Madison County, southwestern Montana, USA (45° 31' 22.38" North latitude, 111° 41' 43.11" West longitude)

Reference cited:

Kellogg (1994) - Geologic map of the Norris quadrangle, Madison County, Montana. United States Geological Survey Geologic Quadrangle Map GQ-1738.
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Source Fault in Archean gneiss & Cretaceous granodiorite (Norris South roadcut, Madison County, Montana, USA) 2
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/31675249148 (archive). It was reviewed on 6 November 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 November 2018

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current04:47, 6 November 2018Thumbnail for version as of 04:47, 6 November 20182,995 × 3,488 (6.44 MB)Lu Brito (talk | contribs)Transferred from Flickr via #flickr2commons

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