Whitby Mudstone Formation, Geological formation in Yorkshire, England.
The Whitby Mudstone Formation is a geological layer made of medium to dark grey rock and sediment found along the Yorkshire coast. The rock layers stretch for several kilometers and contain many fossil remains from ancient seas.
This rock layer formed between 176 and 183 million years ago during the Early Jurassic period when this area was covered by sea. The sediments accumulated in a warm, productive ocean that supported a variety of marine life.
This geological layer is known among researchers for preserving evidence of ancient sea life, offering insights into how marine ecosystems functioned during the Early Jurassic. Visitors walking along the Yorkshire coast can observe these stone layers where ancient organisms were buried and fossilized.
The best time to visit is during low tide when more rock faces are exposed along the coast. The area between Hawsker and Whitby is easiest to reach and offers good spots for exploring.
The layer contains fossils of flying reptiles and sea reptiles, including a rare skull of an Early Jurassic flying reptile. These finds show how diverse the inhabitants of this ancient ocean were.
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