Exeter Trap stone

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Exeter Trap stone

Trap is the popular local name for a type of grey or purple volcanic ash, commonly peppered with holes, used in the Exe valley. This stone could be found in a number of places along the Exe valley, notably at Rougemont in Exeter, and Thorverton and Silverton where small volcanoes had erupted in the Permo-Triassic period c. 250 million years ago.

Volcanic stone of this type can be seen in Exeter’s city wall, where it was used both in the Roman period and throughout the Middle Ages. It can also be seen at Exe Bridge (c. 1200), in some of the houses of Cathedral Close, and in some of the houses of the High Street and South Street.