A Manual of Elementary Geology / or, The Ancient Changes of the Earth and its Inhabitants as Illustrated by Geological Monuments

by Sir Charles Lyell

Nerinæa hieroglyphica. Coral rag.

Fig. 274.

Nerinæa Goodhallii, Fitton. Coral rag, Weymouth. ¹/₄ nat. size.

A division of the oolite in the Alps, regarded by most geologists as coeval with the English coral rag, has been often named "Calcaire à Dicerates," or "Diceras limestone," from its containing abundantly a bivalve shell (see [fig. 275.]) of a genus allied to the Chama.

Fig. 275.