124 



NOTES ON THE DRIFT DEPOSITS 



t 





upon a light coloured silty clay, con- 

 taining the remains of fresh water 

 shells. These beds have evidently 

 been formed in small swamps, by 

 obstruction to the natural drainage. 

 The most remarkable of them is that 

 seen a little south of the Gynn, 

 where the bed of peat is about 4 

 feet in thickness. In it are some 

 hazel nuts, besides oak, birch, hazel, 

 alder, and willow trees ; but to my 

 knowledge, up to the present time 

 no fossil bones or other remains of 

 animals have been met with in it, 

 so as to render it worthy of a more 

 detailed description. 



The brownish coloured brick clay, 

 No. 1, appears to cap the deposits 

 the whole of the distance lying be- 

 tween Blackpool and North Fell, 

 whether they consist of clay or sand 

 and gravel. 



The cliiT at Blackpool, for the 

 distance of about a mile, consists of 

 clay and silt, with some isolated 

 patches of stratified sand and gravel. 

 Then comes about a mile and a half 

 of stratified sand and gravel. The 

 remainder of the distance to Rossall 

 is composed of clay, with beds of 

 silt at North Fell. See wood-cut, 

 which, although on an exaggerated 

 scale, will give some idea of the 

 section.* 



* The beds of sand and gravel dip much more in the wood-cut than when see 

 in the natural section, where they appear almost level. 



