Rocks / Wrekin quartzite, Ercall quarry.

The Wrekin quartzite is exposed in Ercall quarry, Shropshire, from where this specimen was collected  The quartzite is composed of  fine pale grey quartz sand, consolidated by siiceous cement. It is lower Cambrian in age, and the quartzite is resting unconformably on the Uriconian volcanics.

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