SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
The Blue Lias of Lyme Regis was laid down in the Jurassic Period around 200 to 145 million years ago. The alternating bands of limestone and clay are evidence of rhythmic sedimentation, probably caused by seasonal climatic variations. The horizontal strata represent an ancient sea floor, each bedding plane has the remains of Jurassic animals preserved as fossils.
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