 The Teign Valley Group is subdivided into numerous formations, two of the more significant of which are the Dowhills Mudstone and Teign Chert formations.The Chudleigh Group divides into an upper Ugbrooke Sandstone Formation and a lower Winstow Chert Formation.The Culm Measures give their name to The Culm national character area and natural area of England, a component of a landscape classification system co-ordinated by the public body Natural England.