SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Lower lias. View of beds of sedimentary lower lias rock strata (dark grey, at right) at Golden Cap, Dorset, England. The cliff has been eroded by the action of water, exposing the underlying rock strata. These beds of hard limestone and clays were laid down in the early part of the Jurassic period (195-172 million years ago). Lias rock in Britain is a rich source of ammonite fossils. Ammonites, which are now extinct, were molluscs with distinctive coiled shells. They are closely related to the modern day nautilus.
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