﻿452 



ME. E. H. EASTALL ON THE 



[Aug. 1905, 



^ At the eastern end of the same excavation the succession is 

 different. Above the lowest band of nodular ironstone come in 

 10 feet of shale with lines of small doggers ; then 1 foot of black 

 shale, almost a coal-seam, succeeded by another 5 feet of shale ; and 

 then a thin bed of sandstone, which is continuous with the thick 

 sandstone of the western end of the quarrj^. 



Fig. 2. — Boulby dlum-tuorTcs, eastern quarry. 



6 = Shale of the Estuarine Series. 

 5 = Sandstone of the Estuarine 



Series. 

 4 = Conglomerate. 



3 = Impure coal. 



2 = Ironstone. 



1, 1, 1 = Alum-Shale. 



It is evident that here, at the eastern end of the section, the 

 sandstone rests upon an eroded surface of Lias; the Dogger seems to 

 be represented only by the basal conglomerate at the western end, 

 and is absent towards the east. 



At another point in the Boulby-Cliff quarries, immediately above 

 the ruins of the old buildings at the western end, the massive sand- 

 stone descends very low, and rises again sharply within a short 

 distance; there is no fault, and the overlying beds a little way 

 above remain horizontal. At the base of this mass of sandstone the 

 section is as follows : — 



Thickness in feet inches. 

 Very thick, massive, brown sandstone. 



Ironstone, with white fragments 1 



Pebble-Bed 3 



Shale, with ferruginous partings ..... 3 



Ironstone 4 



Shale 3 



Soft ironstone 2 



The Pebble-Bed is here evidently the line of separation, and the 

 beds below it belong to the Lias. The upper limit of the mass of 

 sandstone is inaccessible and not clearly denned, but the depth of 

 the hollow in which it lies cannot have been less than 50 feet. 



In this neighbourhood the most striking feature is the very 

 uneven line of demarcation between the Lias and the Oolites, 

 giving clear evidence of contemporaneous erosion and 

 unconformity. 



