A reinterpretation of the basal ‘Littoral Lias’ of the Vale of Glamorgan

The conglomeratic Sutton Stone of the Vale of Glamorgan, which has for many years been thought of as a littoral deposit laid down by the first waves of a transgressive sea during a long period of early Jurassic time, is here interpreted as a mass flow deposit laid down very rapidly, probably by a storm.