Blue Lias
Blue Lias, Formation (stratigraphy), Lias Group, Limestone, Shale, Fossil, Ammonite, Stratigraphy, Mudstone
978-613-4-94127-3
6134941271
68
2011-03-25
29.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Blue Lias is a geologic formation in southern, eastern and western England and parts of South Wales, part of the Lias Group. The Blue Lias consists of a sequence of limestone and shale layers, laid down in latest Triassic and early Jurassic times, between 195 and 200 million years ago. The Blue Lias is famous for its fossils, especially ammonites. Its age corresponds to the Rhaetian to lower Sinemurian stages of the geologic timescale, thus fully including the Hettangian stage. It is the lowest of the three divisions of the Lower Jurassic period and, as such, is also given the name Lower Lias. Stratigraphically it can be subdivided into three members: the Wilmcote Limestone, Saltford Shale and Rugby Limestone
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