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File:Dolerite intrusion - geograph.org.uk - 1373107.jpg

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English: Dolerite intrusion, Tuff rock formation — Wales
  • Crags below Crib Goch are mostly developed in the Ordovician Lower Rhyolitic Tuff Formation, which are the products of eruption from and within the main Snowdon caldera around 450 million years ago.
  • Here a prominent rib in this ice-hewn valley side comprises a dolerite intrusion which is more massive and less shattered than the surrounding outcrops of tuff, and it has created a distinct step in the glaciated profile. The dolerite is a remnant of subsequent magma feeders to the surface eruptions.
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Source From geograph.org.uk
Author Jonathan Wilkins
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Jonathan Wilkins / Dolerite intrusion / 
CC BY-SA 2.0
Jonathan Wilkins / Dolerite intrusion
Camera location53° 04′ 48″ N, 4° 02′ 13″ W  Heading=225° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo
Object location53° 04′ 46″ N, 4° 02′ 18″ W  Heading=225° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Jonathan Wilkins
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current14:33, 28 February 2011Thumbnail for version as of 14:33, 28 February 2011640 × 480 (97 KB)GeographBot (talk | contribs)== {{int:filedesc}} == {{Information |description={{en|1=Dolerite intrusion Crags below Crib Goch are mostly developed in the Ordovician Lower Rhyolitic Tuff Formation, which are the products of eruption from and within the main Snowdon caldera around 450

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