500 



THE WONDERS OF GEOLOGY. 



Lect. V. 



where meet his view in the quarries and on the road-side. 

 In many parts of Wiltshire, Berkshire, and Gloucestershire, 



Lign. 111. — Shells and Echinites from the Oolite and Lias. 



Fig. 1 . Trigonia clavellata ; from the Oxford clay. 



2. ; a limestone cast, from Portland. 



3. Cidaris Blumenbachii ; Oolite, Calne. 



4. Trigonia costata ; Oolite, Higlnvorth. 



5. Spine of fig. 3. 



6. Gryphaea incurva ; Lias. 



7. Ammonites Walcotii; Lias. 



the Coral-rag is extremely rich in organic remains ; corals, 

 shells, and echinites, occurring in almost every mass of 



