The strata are exposed on the coast between Exmouth and Budleigh Salterton where the type section is defined.

[2] Around 200 - 255m of silty mudstones between the coast near Exmouth north to Aylesbeare, beyond which it is not separately mapped.

[3] Around 200m of silty mudstone in the Exeter area rising to 275m thickness on the coast between Littleham Cove and Budleigh Salterton (type section).

The formation has been mapped northwards from Littleham to the vicinity of Aylesbeare but is not separately distinguished beyond there.

[4] The formation comprises between 30 and 50m of sand and silt, representing weathered sandstone and siltstone, at outcrop between the east Devon hamlets of Westwood and Mutterton.