FOUND NEAR BLACKPOOL. 



123 



red sandstone at Barrow Mouth near Whitehaven, had been 

 reached under them ; so the result of the boring cannot be 

 depended upon as giving any correct idea of the thickness of 

 the drift at or near Poulton Breck. 



In speaking of these deposits, my observations will relate to 

 the higher ground lying to the north of Blackpool, and not to 

 the low peaty district lying to the south of that town. 



The whole of the country appears to consist of the following 

 beds, in a descending order, namely : — * 



1st. A bed of brown clay, mixed with stones, 

 used in brick-making, of about 4ft. to 5ft. 



2nd. A brownish coloured clay, containing stones and 

 so many pieces of limestone as to render it unfit for the 

 purpose of making bricks. It is called " good till" in 

 the neighbourhood. The clay is often replaced by stra- 

 tified beds of sand and gravel 80ft. 



3rd. A bed of silt of a liglitish brown colour, contain- 

 ing a few pebbles, of about 2ft. 



4th. Brownish coloured till,' mixed with stones to the 

 extent of nearly one-third of its whole mass, exposed ...30ft. 



From the above it will, at once, appear that the drift depo- 

 sits here are of a much simpler composition than the beds 

 found near Manchester, and fully tabulated at p. 204 of the 

 second paper before alluded to.f This probably may arise 

 from some of the upper beds having been removed, and the 

 inferior ones not being now exposed. 



The cliflF from Blackpool to Rossall varies in height from 

 40 to 90 feet, or thereabouts, and has an undulated character. 

 In some of the hollows found in it are thin beds of peat lying 



* The forest sand on the highest part of the cliff in Bispham is not noticed 

 here, but it lies upon the brick yard clay. When this paper was read the 

 author took it for a recent sand hill. He has not seen it in any other localities than 

 this one, but it appears to occupy the same position as the forest sand of Kersal 

 Moor. 



t Vol. viii. (second series) of the Jlcmoirs of the Society, p. 201. 



