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File:Upper Rhyolitic Tuff Formation - geograph.org.uk - 1373619.jpg

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English: Upper Rhyolitic Tuff Formation in Wales.
  • As seen from Llyn Bach, the formidable cliff of Clogwyn y Person shows a very clear boundary between the Bedded Pyroclastic Formation and the Upper Rhyolitic Tuff Formation.
  • Immediately above the lake shore, typical outcrop of the Bedded Pyroclastic Formation is succeeded by layers of hyaloclastite (basaltic glass produced by quenching lava in water) and basalt flows (dark layer above scree).
  • The Upper Rhyolitic Tuff Formation overlies the irregular surface of the basalt flows, and represents the last eruptive outburst in the evolving Ordovician Snowdon caldera.
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Source From geograph.org.uk
Author Jonathan Wilkins
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Jonathan Wilkins / Upper Rhyolitic Tuff Formation / 
CC BY-SA 2.0
Jonathan Wilkins / Upper Rhyolitic Tuff Formation
Camera location53° 04′ 47″ N, 4° 04′ 07″ W  Heading=135° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo
Object location53° 04′ 45″ N, 4° 04′ 04″ W  Heading=135° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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Attribution: Jonathan Wilkins
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current16:37, 28 February 2011Thumbnail for version as of 16:37, 28 February 2011480 × 640 (95 KB)GeographBot (talk | contribs)== {{int:filedesc}} == {{Information |description={{en|1=Upper Rhyolitic Tuff Formation As seen from Llyn Bach, the formidable cliff of Clogwyn y Person shows a very clear boundary between the Bedded Pyroclastic Formation and the Upper Rhyolitic Tuff Form

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