LIMESTONE ^ CALCAREOUS SANDSTONE. 77 



near Malton already mentioned. In the bank near Whitwell, on the 

 road that descends to Kirkham bridge, the oolite is at the top of the 

 declivity, the sandstone with yellow marl a little way down, and the 

 shale presently succeeding. In like manner, in proceeding from Cas- 

 tle Howard park to Terrington, we find the oolite succeeded by the 

 blue limestone, and that by the sandstone and yellosv marl; a little 

 below, in the valley on the east side of Terrington, we find the shale; 

 and in ascending to Terrington, we again discover the sandstone and 

 marl, lying immediately over the shale; or if any beds are interposed, 

 they must be extremely thin. At Filey, on the contrary, the thick- 

 ness of the series is considerable, and the beds are numerous; yet 

 their number is much greater at Wass bank and Rowlston scar; at 

 which places, as well as at Whitestone cliff, tlie thickness of the se- 

 ries, without the oolite, may be estimated at about 200 feet. 



In these strata, it is common to find sandstone and limestone 

 alternating : yet, generally speaking, the calcareous matter diminishes, 

 and the sandy matter increases, towards the lower part of the series 

 In Rowlston scar, one of the lowest accessible beds is a sandstone, 

 mixed with yellow marl, similar to tliat at the top of the precipice, and 

 containing a number of petrified shells. Below it is a thin bed of 

 sandy marl, with shells imbedded in it, not in a petrified state, but 

 merely preserved. Among the more calcareous beds, is a hard lime- 

 stone, of a dull brown colour, or brownisli yellow; which, when 

 recently broken, presents a granular texture, and a glimmering lustre; 

 numerous small crystals, chiefly oblong, appearing in the fracture. 

 In Wass bank are some calcareous beds more highly crystalline, and 

 very hard. One of these beds is of an ash grey colour, and there are 

 two others of a lighter hue. They are very compact; and the thin 

 edges of their fragments are translucent. 



Though Whitestone cliff, Rowlston scar, and Wass bank are 

 at a short distance from one another, particularly the two formej', 



