Deposition of turbidites and agitated-water siltstones : A study of the Upper Carboniferous Westward Ho! Formation, North Devon

The Westward Ho! Formation consists dominantly of mudstones and siltstones. Two distinct groups of facies can be contrasted. The first contains very fine grained black mudstones and parallel bedded graded siltstones and fine sandstones which show all the sedimentary structures now associated with turbidites. By contrast, the second group of facies contains irregularly rippled and cross-bedded siltstones and sandstones, the sedimentary …