File:Fault in Archean gneiss & Cretaceous granodiorite (Norris South roadcut, Madison County, Montana, USA) 2 (31675249148).jpg
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[edit]DescriptionFault in Archean gneiss & Cretaceous granodiorite (Norris South roadcut, Madison County, Montana, USA) 2 (31675249148).jpg |
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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Date and time of data generation | 13:58, 13 August 2018 |
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File change date and time | 02:41, 25 October 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:58, 13 August 2018 |
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Date metadata was last modified | 22:41, 24 October 2018 |
Unique ID of original document | A4433F2232C7EB395E490116994A8EA3 |
IIM version | 18,755 |