File:Sandstone with fault slickenside (Lakota Sandstone, Lower Cretaceous; Rapid City, South Dakota, USA) 1 (31588901794).jpg

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Sandstone with fault slickenside (SDSMT 1705, South Dakota School of Mines and Technology Museum of Geology, Rapid City, South Dakota, USA)

Faults are quite common in orogenic belts. Faults are defined as fractures in rocks along which differential displacement has occurred. Dip-slip faults are those involving movement of rocks in non-horizontal directions. Strike-slip faults involve movement of rocks in horizontal directions.

The two common types of dip-slip faults are normal faults and reverse faults. Normal faults form by extensional stress. Reverse faults form by compressional stress.

The sandstone sample shown above has a fault plane surface facing the viewer. Click on the photo to zoom in and look around - the fine left-to-right lines and striations are slickenlines, which indicate fault movement direction.

Locality: undisclosed/unrecorded site at or near the town of Rapid City, western South Dakota, USA
Date
Source Sandstone with fault slickenside (Lakota Sandstone, Lower Cretaceous; Rapid City, South Dakota, USA) 1
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@N05/31588901794. It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

1 December 2019

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Date/TimeThumbnailDimensionsUserComment
current08:59, 1 December 2019Thumbnail for version as of 08:59, 1 December 20193,006 × 1,546 (3.77 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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