Blue Lias facts for kids
It is part of the Lias Group. The Blue Lias consists of a sequence of limestone and shale layers. It was laid down in late Triassic and early Jurassic times, between 195 and 200 million years ago. The Blue Lias is famous for its fossils, especially ammonites. Also found were remains of a number of dinosaurs, and the pterosaur Dimorphodon.
The Blue Lias alternates between limestone, (with some clay), and mudstone. These alternations are caused by short-term climatic variations, thought to be caused by Milankovitch cycles. The blue/grey colour is given by iron pyrite.
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Blue Lias Facts for Kids. Kiddle Encyclopedia.