The Palaeontological Association Field Guide to Fossils, ...
Swift, Andrew / Martill, David M
The Rhaetian Penarth Group includes the former Westbury Beds, Cotham Beds, and White Lias. It crops out in a narrow strip from the Devon and Dorset coast to the mouth of the Tees, and is particularly well known from the exposures along the Bristol Channel. This diverse suite of late Triassic sedimentary rocks is internationally famous for the fossils that it yields, most notably from the bone beds. Coverage is comprehensive, with separate chap...