V.—The Probable Source of the Limestone Pebbles in the Bunter Conglomerate of West Somerset

Abstract

When the Budleigh Salterton Pebble-bed is traced northward into Somerset it loses its unconsolidated character and passes into a calcareous conglomerate. The change takes place north of Burlescombe, and is complete at Thone St. Margaret; thence to Combe Florey this division of the New Red Sandstone Series is generally represented by a conglomerate composed of pebbles of limestone, quartz, and grit, more massive in its lower part. For some distance north of Combe Florey the upper beds of the division are faulted out and the lower beds are represented by a loose, rubbly gravel of subangular fragments of Devonian grit in an earthy or sandy matrix. The conglomerate reappears at Vellow, near Stogumber, and is found in several places in the Williton district, whilst in other places it is represented by gravels, sands, and sandstones.