74 DESCRIPTION OF THE STRATA. 



are scaicely any. A few shells, however, occur here and there, in 

 almost all the beds of this series ; and in some of them the number 

 is considerable. 



There are some parts of the oolite hills where no bed has been 

 discovered analogous to the blue and grey limestone. It is not found 

 in Rowlston scar and Whitestone cliff: nor does it exist in Wass 

 bank, unless we suppose it to be represented there by a bed of whitish 

 sandy limestone, having a faint resemblance to the Hildenley stone. 

 The authors did not observe it in the channel of the stream at Kirk- 

 dale church, nor at any place to the westward of that spot; though 

 it is found at Kirkby Moorside. 



The next remarkable bed in this sei-ies is one that consists of 

 calcareous sandstone with yellotv marl. This bed, which is often two 

 or three yards or more in thickness, generally occurs a little below 

 the oolite. It may be seen at Nawton, where the road between 

 Helmsley and Kirkdale is cut through it, the oolite being there 

 wanting. It forms a conspicuous feature in the upper part of Rowls- 

 ton scar. We find it at Dalby ; at Terrington; in a bank on the side 

 of the road between Terrington and Castle Howard ; on the side of 

 the road from Malton to Whitwell, near Cramb bridge ; and in de- 

 scending the bank leading to Kirkham bridge, near Whitwell; in 

 which place the oolite is seen at the top of the bank, a little above it. 

 Many other localities might be pointed out; but it will be sufficient 

 to add, that it is found in the Filey rocks, under the blue and grey 

 stone, and may be seen in most of the northern fronts of the oolite 

 hills, as in Silphoue moor, in the slope fronting to Harwood Dale. 

 In some of these places we see only one bed ; in others two or more 

 beds, with other strata interposed. 



This species of rock exhibits a curious compound, the yellow 

 marl, which is often sandy, being distributed throughout the sand- 

 stone in numerous irregular patches of all sizes and forms; and these 



