650 



THE WONDERS OF GEOLOGY. 



Lect. VI. 



strata of mountain limestone consist entirely of remains of 

 Crinoidea, principally of one species of the Encrinites, or 

 cylindrical stems ; and in Derbyshire some of the beds form 



LlGN. 14G. — EncRINITAL MARBLE OF DERBYSHIRE. 



Fig. 1. Entrochites, or fragments of stems of Encrinites, lying in relief on a block of 

 limestone. 

 2. Polished slab of Derbyshire encrinital marble. 



a compact marble {IAgn* 146), which is largely employed 

 for chimney-pieces and other ornamental purposes. 



