1826.] ivhich appear on the Yorkshire Coast. 349 



No. 6, and No. 9, are also found near Weymouth in the next 

 superior formation of Kimmeridge clay. 



The group (No. 11 of the Weymouth section) is within the Hmits 

 of the Kimmeridge clay. The ferruginous beds subordinate to this 

 group contain severalfossils, among which are; 1. Ostrea deltoi- 

 dea, and another large flat species. 2. Lima proboscidea. 3. Pec- 

 ten, the small species above-mentioned. 4. Mytilus pectinatns. 

 5. Casts of mi/a (?). 6. Many irregular branching stems resem- 

 bling those in the lower part of the formation. In this bed the 

 stems are frequently hollow, and are minerahzed by oxide of 

 iron. By way of conclusion to this enumeration, we may 

 remark ; 1. That some fossils are common to the Oxford clay, 

 and the lower part of the coral-rag formation. 2. That the upper 

 part of the coral rag formation alternates with the Kimmeridge 

 clay, and that several fossils are common to the two formations. 

 3. That several fossils (e. g. one or two species of ostrea, trigo- 

 nia clavellata, belemnites, pecten (the small species), casts of 

 mya (.'), &c. &c.) are common to all the beds of the section 

 above described. 



In the cliffs between Weymouth and the Isle of Purbeck, also 

 in many places between Weymouth and Abbotsbury, there are 

 good sections of the coral-rag ; and with considerable changes 

 in the character of individual beds, there is, in all the localities, 

 a general agreement in the arrangement of the groups, and an 

 entire coincidence in the suites of the organic remains. In 

 every section we find a group of calcareous grit sand and sand- 

 stone at the bottom, beds of oolitic limestone in the middle, and 

 beds of comminuted shells, coral rag, &,c. at the top of the 

 formation. 



Coral Rag Formation near Steeple Ashton, S)X. 



The formation is exposed near Steeple Ashton in a succession 

 of quarries ; but the denudations are not comparable to those 

 near Weymouth. They enable us, however, to determine that 

 the general arrangement of the groups is the same with that 

 above described. Over the Oxford clay are beds of sand and 

 calcareous grit ; these are succeeded by beds of coarse oolite 

 (pisolite of Smith; ; and the oolite is surmounted by beds of 

 ragstone, containing innumerable stems of corals, and a suite of 

 organic remains nearly identical with the Weymouth series. 



Near Calne, in Wiltshire, the denudations are imperfect, but 

 the general arrangement of the formation appears to agree with 

 that which is above stated. In that neighbourhood some of the 

 beds are remarkably modified, though not so much as to destroy 

 the leading characters of the deposit. For example, in some of 

 the escarpments near Bow-wood Park, the calcareous matter is 

 almost wanting, and the calcareous grit passes into a very fevru- 



