126 DESCRIPTION OF THE STRATA. 



7. Second bed of dogger, of a blueish colour, with numerous 

 specks, some of Avhich are white, and some black and shining ; 1 foot 

 and a half. 



8. Third bed, of a brownish colour, with blue patches or seams ; 

 2 feet. 



9. Fourth and lowest bed, lying immediately over the aluminous 

 schistus, of a brownish colour ; 3 or 4 feet. — The last three beds are 

 parted by cross fractiu'es, in which is found, as in other parts of the 

 dogger, ferruginous matter in plates or veins, or in a kind of powder. 

 In these beds also, especially in No. 8, we find quantities of shells, 

 not generally diffused through the stone, but in clusters or groups, here 

 and there. The shells are most numerous among the ferruginous matter 

 that fills up the cracks or cross fissures. 



At Falling Foss, which is in the same valley, about a mile fur- 

 ther up, the dogger beds are of a similar description, but inferior in 

 thickness. They contain a number of shells, which are most abund- 

 ant in the seams between the blocks. Where the shells occur, the 

 stone not only contains much calcareous matter, but is strongly 

 impregnated with iron, and hence many of the shells have a blueish or 

 iron-grey coating, while others appear rusty or ochreous. It is rather 

 singular, that the shells correspond with those which occur in the 

 oolite, more than with those in the aluminous schistus. 



In the sea cliffs at Peak, where the dogger first makes its appear- 

 ance, it is composed of thick beds of coarse argillo-calcareous sand- 

 stone, of a dark grey or dusky colour, containing little iron, but 

 abounding with specks of mica. Here also organic remains occur in 

 considerable quantity, partly dispersed throughout the stone, but 

 principally in calcareous patches or nuclei, imbedded here and there. 



To this account of the dogger we may add, that in the hills 

 fronting the plain of Cleveland, as at Guisborough, Ayton, Carlton, 

 &c., there seems to be no bed corresponding with it \ or perhaps it 



