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Lias

   Also found in: Acronyms, Encyclopedia, Wikipedia 0.03 sec.
Lias [ˈlaɪəs]
n
(Earth Sciences / Geological Science) the lowest series of rocks of the Jurassic system
[C15 (referring to a kind of limestone), C19 (geological sense) from Old French liois, perhaps from lie lees, dregs, so called from its appearance]
Liassic  [laɪˈæsɪk] adj


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There were huge tortoises too, paddling about among these other reptiles, which Perry said were Plesiosaurs of the Lias.
 
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