﻿454 MR. R. H. RASTALL ON THE [Aug. T905, 



meratic rock before described, passing locally into a coarse yellowish 

 sandstone. The fossils occur only as internal casts, and therefore 

 determination is difficult : — 



Avicula incequivalvis. 

 Tholadomya Scsmanni. 

 Pecten demissus. 

 Trigonia striata. 

 Goniomya angulifera. 



Nerincea cingenda. 

 Cerithium quadrivittatum. 

 Turbo Icevigatus. 

 Pleurotomaria sp. 

 Alaria. 



The facies of this small fauna is quite indisputable evidence of 

 3 horizo 

 made out. 



its horizon, although the exact relations of the beds cannot be 



(2) Eskdaleside. 



At the alum-quarry on Eskdaleside, commonly known as Spence 

 Works, is a very fine exposure of Upper Lias and Estuarine Beds. 

 The junction is accessible at several points, and admirably clear ; 

 the succession is as follows : — 



Thickness in feet inches. 

 Soft yellow Estuarine Sandstone. 



Hard, blue, calcareous shale 1 9 



Blue shale, false-bedded 1 



Impure coal 1 6 



Soft, ferruginous, shaly sandstone, with lenticles of shale ... 7 

 Bed, fine-grained rock, in large blocks with thick ferruginous 



coatings, in four beds 8 



Pebble-Bed 3 



Soft grey clay 6 



Soft blue Alum-Shale. 



Pebble- Bed. — The lower pebbles are embedded in a soft 

 grey clay, 4 to 6 inches thick, which passes gradually up into the 

 overlying bed ; but the bulk of them are enclosed in the ferru- 

 ginous scaly coatings which surround the blocks of red rock. 

 The pebbles become smaller upwards, and small ones are scattered 

 through the red grit for a few inches upwards. The scaly coats 

 surrounding the blocks of red grit are often 4 or 5 inches thick, 

 and separate it into large cubical or rounded blocks, of very 

 peculiar character. 



These beds are almost unfossiliferous. 



(3) Glaisdale. 



We now come to what is, perhaps, the most interesting and 

 satisfactory of all the inland sections, and second in importance 

 only to the section at Blea Wyke itself. 



In the neighbourhood of Glaisdale the Dogger contains much 

 more iron than usual, so much so that it was worked as an ore, for 

 the supply of the long-defunct Glaisdale Ironworks. It was worked 

 by drifts on the west side of the dale, and from the spoil-heaps 

 below these drifts many fossils can be obtained. 



