416 



mere Forest, are two acclivities, each about 60 feet high, and distant 

 about a mile and a half from each other. Narley Bank is situated on 

 the summit of the second ridge, and the gravel-pit is in the face of the 

 northern declivity, about 157 feet above low-water mark at Weston 

 Point, and six miles from it. The gravel differs from the common 

 gravel of the country by the prevalence of calcareous matter and the 

 small proportion of fine sand ; but agrees with the gravel at the Wil- 

 lington, described in a former paper*. This resemblance induced the 

 author to search for shells, and he found, at a second visit to the pit, 

 several imperfect fragments of apparently recent marine shells. 



In conclusion. Sir Philip Egerton states that he has always found a 

 marked distinction, in Cheshire, between the gravel containing re- 

 cent shells and that which does not ; and he infers, from the former 

 being occasionally covered, as at the Willington, by a thick deposit 

 of sand and gravel, that it was accumulated before the occurrence of 

 the last drift, to which he ascribes the origin of the common detritus 

 of the county. 



A paper was afterwards read, entitled "Accompanying remarks to 

 a section of the Upper Lias and Marlstone of Yorkshire, showing the 

 limited vertical range of the species of Ammonites and other Testacea, 

 with their value as geological tests," by Louis Hunter, Esq., and 

 communicated by John Forbes Royle, Esq., F.G.S. 



The portion of the coast to which this paper immediately refers is 

 called the Easington Height, situated between Whitby and Redcar, 

 and presents the following details : 



INFERIOR OOLITE. 



Upper Lias Shale. 



Shale 3.5 feet 



Hard or cement stone bed 25 



Shale, containingnodules of ironstone 90 



Jet rock 20 to 30 



Hard compact sandy shale 30 



about 200 



Marlstone. 



Thin seams of shale, alternating with hard iron- 

 stone bands, a foot thick , . . . 25 



Sandy shale, with beds of dogger 63 ? 



Alternating beds of calcareous sandstone and 



sandy shale 40 



Shaly sandstone, passing gradually into the lower 



lia's shale 30 ? 



160 



Lower Lias Shale 150 



The beds of shale superior to the jet rock are characterized by the 

 presence of Nucula ovum, Orbicula rejiexa, Plagiosioma pectinoide. 

 Ammonites communis, A. heterophyllus, A. Jimbriafus, A. Walcottii, 



* Proceedings Geol. Soc, vol. ii. p. 189. 



