(n.) 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). lias. Retrieved September 22, 2026, from http://smartdefine.org/lias/definitions/2027666 |
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