The Rhaetic beds are a group of strata which occur at the top of the Triassic and at the base of the Jurassic system. They are also known as the White Lias, or the Avicula contorta beds, from one of their best known and commonest fossils. In England they may be traced from the coast of Devon past Bristol to Redcar on the Yorkshire coast, forming a narrow strip on the west side of the Lias shales. They contain comparatively few fossils; but their fauna, though small, is very characteristic, and includes several forms that do not occur elsewhere. Research Rhaetic Beds
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Abbreviations
Research Rhaetic Beds
