blue lias

noun

a type of rock composed of alternating layers of bluish shale or clay and grey argillaceous limestone See also Lias

In the course of last year; a fossil crocodile was dug up at Allemagne, a village about a mile distant, imbedded in blue lias.

With this in mind, the contractors proposed to substitute an English Blue Lias lime as a grouting material.

The base of the cliffs consists entirely of a very soft and plastic blue lias mud.

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