408 



PEOCEEDIl^GS OF THE GEOLOGICAL SOCIETY. [Juno 23, 



deposits had scarcely been suggested *, the author thought it best to 

 remain ignorant of what had been said about this particular locality 

 previously to his making a series of personal observations f. 



* Mr. Hull has lately worked out this division in some of the more inland 

 districts of Lancashire. See Mem. Lit. Phil. Soc. Manchester for 1863-64, and 

 Memoirs of the Geological Survey. 



t Since making observations on the Blackpool drifts, I have seen perhaps the 

 finest section of the three drifts in vertical succession to be met with in south 

 Britain. It is about 1 50 feet high, and embraces Lower Boulder-clay, middle 

 sand and gravel, and Upper Boulder-clay. The drifts are exposed in a river- 

 cliff at Kedscar, about three miles north-east of Preston. They will be described 

 in one of Mr. Hull's forthcoming Geological Survey Memoirs. The Lower 

 Boulder-clay is here much less stony than at Blackpool and in Furness. 



Pig. 1. — STcetch-map of parts of Lancashire and Cumberland. 





SlaelcpooJ 



T^haiTV 



JBTorecanLbe (|%?/ (^^^j^^. 



jEtQSsdM 



S^r.'ft 



B,3^ 



Lower Boulder-clay. 



Middle Sand and 

 Gravel. 



Upper Boulder-clay. 



EXPLANATION 



The Maps of north-west Lancashire and part of Cumberland are intended to give 

 are either driftless, or they have not been examined by the author. In Furness 

 believed to be equivalent to the more decided drift of the neighbourhood. 



