294 J. F. BLAKE AND W. H. HTJDLESTON OJT 



declivities are formed, by Oxford Clay, the Corallian beds being 

 merely on the surface. We meet here with the following section, 

 showing the whole series in 9 feet. 



Section of Corallian beds at " Green's Cleeve" 



ft. in. 



1. Coral-bed of Thamnastreea, Thecosmilia, &c, seen 



at a few yards distance, at a slightly higher level, 

 and resting on 



2. Pisolite and rubbly oolite, in broken pieces, with 



Lima elliptica and Avicula ovalis 3 



3. Large-grained oolite marl G 



4. Rubbly oolite, with Cerithium muricatum, with 



Lima e\ 'Mptica, Avicula ovalis, Lucina, sp 1 10 



5. Clay, with innumerable shell-fragments and oolitic 



grains, Hemicidaris-spmes 8 



G. Yellow sand, with loose alternating layers of clay, 



and much intermixed and irregularly laid 3 



The luxuriance of oak-trees a few feet below show that the Oxford 

 Clay is not far off, and that we are, indeed, seeing the feather-edge 

 of a formation. The occurrence of Avicula ovalis, so characteristic 

 of the lower beds, indicates that these rubbly oolites are more to be 

 associated with the sands below than with the coral-growth above. 



The thickening of the series on the dip, in the direction of the 

 fuller development at Goatacre, may be seen in another neighbour- 

 ing quany, of which the section is here given. 



Section in Catcombe Quarry. 



ft. in. 



1. A mass of drifted corals and oolites, much mixed 



up with clay 4 



Though the corals are numerous, their state and 

 position indicate that they have not lived on the 

 spot where we now see them, but have been drifted, 

 though not, perhaps, from far. Associated with 

 them are Littorina muricata, Cueullaa clongata, 

 Lima rudis, and Cidaris florigemma. 



2. "White, large-grained oolites, marly and loose, 



pisolitic at the top, and browner and less earthy 



towards the bottom 9 



This bed probably corresponds to Nos. 2-4 of 

 the last section, and contains Cerithium mu- 

 ricatum, Littorina muricata, Opis PhUlipsi, 

 Sowerbya triangularis, Tancrcdia, sp., Myacites 

 securiformis, Pecten fibrosus, P. qualicosta, Ecki- 

 nobrissus scutatus, and Serpula sulcata. 



3. Sand, with argillaceous layers towards the top, 



with irregular bands of shelly limestone, 8 or 10 



inches thick towards the base G 



For these the quarry is chiefly worked as wall- 

 and building-stone. Tbey are highly crystalline ; 

 and the fossils are beautiful pseudomorphs in cal- 

 cite, the chief being Natica clytia ; EhynchoneUa 

 Thurmanni also occurs. 



