Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Gryphcea incicrva, Sow. (G. arcuata, Lam.) Lias. Plagiostoma (Lima) giganteum, Sow. Inf. Ool. and Lias. Cypricardia, is also characteristic of the lower lias shales. The Lias formation is also remarkable for being the newest of the secondary rocks in which brachiopoda of the genera Spirifer and Leptcena (figs. 440, 441) occur : no less than nine species of Spirifers are enumer- ated by Mr. Davidson as belonging to t
Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Gryphcea incicrva, Sow. (G. arcuata, Lam.) Lias. Plagiostoma (Lima) giganteum, Sow. Inf. Ool. and Lias. Cypricardia, is also characteristic of the lower lias shales. The Lias formation is also remarkable for being the newest of the secondary rocks in which brachiopoda of the genera Spirifer and Leptcena (figs. 440, 441) occur : no less than nine species of Spirifers are enumer- ated by Mr. Davidson as belonging to the Lias. These pallio- branchiate mollusca predominate greatly in strata older than the Trias; but, so far as we yet know, they did not survive the Liassic epoch. The marine beds of the Lias also abound in cephalopoda 27
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