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Image: Recent joint intersection

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Description: A recent tectonic joint intersecting older exfoliation joints in granite gneiss, near Lizard Rock, Parra Wirra Recreation Park, South Australia, 14 May 2012. Note slight sinistral direction of movement along the joint, indicating on first impression that the valley floor is being upthrust relative to the hillside. A subsequent examination showed that this near-vertical joint terminates against the upper of two sub-horizontal joints which define a large wedge-shaped block pointing into and beneath the outcrop, indicating that lateral compression is also likely to be involved. Original filename = DSC12042.jpg
Title: Recent joint intersection
Credit: Own work
Author: Bahudhara
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes

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