| lias | <geology> The lowest of the three divisions of the Jurassic period; a name given in England and Europe to a series of marine limestones underlying the Oolite. Origin: Cf. F. Lias, fr. Liais sort of limestone, OF. Also liois; perh. Of Celtic origin, cf. Armor. Liach, leach, a stone, Gael. Leac, W. Llech. Cf. Cromlech. Source: Websters Dictionary (01 Mar 1998) |
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| liassic | <geology> Of the age of the Lias; pertaining to the Lias Formation. Same as Lias. Source: Websters Dictionary (01 Mar 1998) |