SG Heritage Dictionary

Lias [Noun] Webster's Dictionary 1828

A species of limestone, occurring in flat, horizontal strata, and supposed to be of recent formation.

Lias [Noun] Webster's Dictionary 1913

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. See the Chart of Geology.

Liassic [Adjective] Webster's Dictionary 1913

Of the age of the Lias; pertaining to the Lias formation.

Liassic [Noun] Webster's Dictionary 1913

Same as Lias.