﻿Vol. 6 1.] BLEA WYKE BEDS IN NORTH-EAST YOKXSHIKE. 449 



Near the middle of this great excavation the following section 

 was measured : — 



Thickness in feet inches. 

 Shales, with ironstone-doggers, etc. 



Massive, brownish -grey, carbonaceous sandstone ... 4 



Sandy carbonaceous bed 1 



Very hard ironstone, with white fragments 2 



Ditto, with many black pebbles 9 



Ditto, without pebbles 1 6 



Bluish shale 3 



Nodular ironstone 1 



Alum-Shale below. 



The lowest band of ironstone is of the ordinary type without 

 pebbles, and probably belongs to the Lias, as also does the 3-inch 

 band of shale, which is not constant. The next three divisions 

 are very similar in character, and differ only in the presence or 

 absence of pebbles. The pebble-band has no definite boundaries, arid 

 is not always at exactly the same distance from the base of the 

 bed. The upper division has a peculiar, vertical, columnar jointing, 

 which is not found in the others. The next bed above this is also 

 peculiar : it can only be described as a mixture of fine coal and 

 sand. In the upper sandstone also plant-remains are very abundant, 

 but fragmentary, and I could only identify Equisetum (columnare ?). 

 Otherwise the whole series appears to be entirely unfossiliferous. 



At the north-western end of this quarry it can be very clearly 

 seen that the Pebble-Bed rests upon an uneven surface, composed of 

 ironstone-nodules, apparently belonging to the Lias. 



(2) Saltwick and Whitby. 



About the middle of Saltwick Bay is a very clear exposure of the 

 Dogger, and the following section was measured, just at the top of 

 the lowest grassy slopes which form the greater part of the cliff in 

 this neighbourhood : — ■ 



Thickness in feet inches. 

 Estuarine Sandstone above. 



Shale 15 



Conglomeratic ironstone, with Lingula JBeanii 3 



Pebble-Bed 3 



Hard, fine-grained ironstone 1 



Alum-Shale, very ferruginous for 1 foot. 



The thicknesses of these beds are variable, especially that of the 

 lower ironstone, and its upper surface seems to be uneven. The 

 upper bed of ironstone is very similar to the bed so well-developed 

 ■at this horizon in most of the inland sections. 



About halfway between Saltwick Nab and Whitby, a very 

 interesting phenomenon may be seen. A small synclinal flexure 

 here brings the junction of the Estuarine Series and the Lias down 

 to high-water mark, and at the lowest point of the syncline there is 



Q. J. GK S. No. 243. 2 x 



