South Devon - Geology
Natural Arch - Thurlestone (S34)
A fine Natural Arch / Sea Stack formed from Permian Age , red-browny purple , Breccio - Conglomerates
(cobbles in a pebble and gravel matrix).
A fault runs through the Rock Arch , causing the hole to form , the fault reappears in the coastal cliffs.
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The coastal area is primarily Lower Devonian (meadfoot group) Slates, with some Permian Age Breccio - Conglomerate Cliffs .
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Thurlestone Rock and the local settlement take their names from 'thirled stone'. The Anglo-Saxon word 'thirl' means hole.
Ref: 6069
Date: 07/09/2018
Location: SX 6763 4123