﻿448 ME. E. H. EASTALL ON THE [Aug. 1905, 



and plant-remains (probably reeds and water-plants) in an upright 

 position are abundant. They indicate deposition in the muddy 

 estuary of a large river. 



The foregoing account applies to the beds as seen in the imme- 

 diate neighbourhood of Blea Wyke Point, and the thicknesses are 

 measured at that place. The whole series can be very well seen in 

 the cliffs to the north ; but the southerly dip soon carries them out 

 of reach, and brings up the Upper Lias to form the base of the cliff. 

 The cliffs here are 600 feet high, and for some distance the lower 

 half, where these beds occur, is nearly vertical, so that they are 

 inaccessible for detailed examination. 



About a mile to the north-west of Blea Wyke, and immediately 

 below the B-aven scar Hotel (formerly Peak Hall, or Raven Hall), 

 the whole series is suddenly cut off by the Peak Fault, which 

 brings up sandy Middle Liassic Shale against the lowest beds of 

 the Estuarine Series. It is noticeable that the beds on the east, or 

 downthrow side of the fault, are bent down sharply towards it 

 for a few yards. This seems to indicate that the last movement 

 along this line was in a direction contrary to that of the chief dis- 

 placement ; that is, that the throw was probably once somewhat 

 greater than it is now, and that a reverse movement occurred at a 

 later period. 



Immediately to the east of the fault is a fine section displaying 

 the whole of the Blea Wyke Series, as far down as the top of the 

 Striatulus -Shales, and overlain as usual by the sandstones, shales, 

 ironstones, and thin coals of the Estuarine Series. The Blea Wyke 

 Beds here are a little thinner than farther east, at least so far as 

 the upper divisions are concerned ; but they retain the same 

 characters as before described, including the characteristic irony 

 weathering and bands of pebbles. It is very interesting to note, 

 that for a short distance east of the fault the uppermost bed (the 

 Dogger proper) takes on the peculiar characteristics of the red rock 

 with pebbles and white fragments which I shall have to describe 

 so often later, as the basement-bed of the Oolite in the Peak alum- 

 works and most of the coast and inland sections. The resemblance 

 between parts of the Yellow Beds and the Lower Greensand of 

 Bedfordshire is here more pronounced than even at Blea Wyke. 



Erom this point the contour-lines turn sharply inland, and there 

 are no more exposures for some distance. 



III. The Coast- Sections. 



(1) Peak Alum- Works. 



The next exposure of the Dogger is in the Peak alum-works, 

 only about half a mile due west of the last ; here, however, the 

 section is remarkably different. 



