In Exeter and Newton Abbot districts: predominantly brown horizontally-bedded gravel with subordinate lenticular beds of trough cross-bedded pebbly sand and sand. The gravel is composed of well-rounded pebbles, cobbles and boulders in a coarse to fine gravel and silty sand matrix. The clasts are mainly (84 to 90%) metaquartzite together with porphyry, vein quartz, tourmalinite, and feldspathic conglomerate. From just south of Hillhead (ST 067 136), locally derived Devonian and Carboniferous clasts begin to appear. Near Milverton, the Formation is massive calcareous conglomerate with limestone clasts.
Rests sharply with marked lithological contrast on Aylesbeare Mudstone Group. Probable disconformity at the contact.
Ventifact bed at top of the formation is present from Budleigh Salterton to Hillhead: it is overlain by sands or pebbly sands of the Otter Sandstone.
Budleigh Salterton: 30m. Exeter district: 15-20m. Hillhead: 24m. Taunton district: 30-35m.
Extends from Budleigh Salterton on south Devon coast to near Minehead on north Somerset coast.
Type Section Sea-cliff at Budleigh Salterton. Whole thickness visible but base may be obscured by landslip. Sharp base on Littleham Mudstone. Ventifact bed at top of formation overlain by aeolian sands at base of Otter Sandstone.
Irving, A, 1888. The red rock series of the Devon coast section. QuarterlyJournal of the Geological Society of London, Vol.44, p.149-163.
Hull, E, 1892. A comparison of the red rocks of the south Devon coast with those of the Midland and Western counties. Quarterly Journal of the Geological Society of London, Vol.48, p.60-67.