TABULAR HILLS. 43 



hundred and thirty feet, to Stonegrave, beyond which place it sinks 

 beneath the vale of Pickering. A branch of this range, separated from 

 Oswaldkirk bank by the valley of Gilling, extends in a south-easterly 

 direction to Malton, where it crosses the Derwent, and, after rising into 

 the high ground of Langton wolds, turns again to the south, and passes 

 under the chalk-hills at Acklam. Some of the strata which belong to 

 this group of rocks, re-appear from below the chalk in the neighbour- 

 hood of South Cave, and are continued in Lincolnshire. The surface 

 occupied by this district is about one hundred and ninety square miles : 

 it includes the following strata : 



Coralline oolite formation. - 



Summits and 

 edges of the 

 tabular hills. 



Slopes of the 

 same hills. 



5 Upper calcareous grit, containing fossils 



resembling those in No. 7- 



6 Coralline oolite, marked by corals, echi- 



ni, plagiostomaej melaniae, &c. 



7 Lower calcareous grit ; pinnae, gryphseae, 



ammonites, &c. 



8 Gray argillaceous earth, containing many 



fossils at the bottom. (Oxford clay of 

 the south.) 



9 Ferruginous or argillaceous sandstone, 



with remarkable gryphaeae, ammonites, 

 &c. (Kelloways rock of the south.) 



Of the strata here enumerated, possibly all may be equally extensive, 

 but some are more easily traced than others. The Kelloways rock, often 

 thirty feet thick, shews itself on the coast at Gristhorpe and Scarborough, 

 and in several points inland along the northern escarpment of the tabular 

 hills ; it also appears on the eastern side of the Derwent, and in the 

 neighbourhood of Cave. Every where, characteristic fossils accompany 

 it, and establish the agreement between this rock, and that so named in 

 Wiltshire, which had been already inferred from geological position. 

 The argillaceous stratum, which separates the Kelloways rock from the 

 lower calcareous grit, represents in Yorkshire the clunch clay, or Oxford 

 clay of the southern counties. It continues along the breast of the 

 great escarpment of the tabular hills from Scarborough towards Hamble- 

 ton and Wass bank, and is less distinctly traceable where the same range 

 turns eastward, by Ampleforth and Castle Howard, but has not yet been 



G 2 



