lias

lias
[ˈlʌɪəs]
noun
  1. (the Lias)(Geology)the earliest epoch of the Jurassic period, lasting from about 208 to 178 million years ago
    (地质)里阿斯统（约从2.08亿年前持续到1.78亿年前的早侏罗纪时代）
    ■the system of rocks deposited during this epoch, consisting of shales and limestones rich in fossils
    里阿斯岩（由富含化石的页岩和石灰岩组成）
    ■(亦作blue lias)[mass noun]a blue-grey clayey limestone derived from marl deposited in the Lower Jurassic, found chiefly in SW England
    蓝里阿斯岩
派生
liassic
adjective
语源
  1. late Middle English (denoting blue lias): from Old French liais 'hard limestone', probably from lie (see lees)
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