This fine-grained limestone is extremely tough and erodes very slowly. Fossils include ammonites, bivalves and snails.
These beds are made from clays, shales, mudstones and limestones. Fossils include dinosaur footprints, crocodiles and fish.
These beds contain sands, marls and clays and erode very quickly. Fossils include water fleas, snails and lignite, which is a type of woody coal.
Formed entirely from layers of sandstone. Fossils include sea urchins and bivalves.