394 



W. SHONE ON THE GLACIAL DEPOSITS OE WEST CHESHIRE. 



In the Tables of Mollusca vr means that 1 to 3 specimens 

 have occurred ; r, 3 to 10 ; f, frequent ; c, common ; a, abundant ; 

 v, very. 



I consider Moel Tryfaen to be the oldest of all these deposits, 

 because there are no southern shells mixed with its Scandinavian 

 fauna. 





■ 







B* 



GO 



'3 





i* 



o 



09 Ph 



o 



■a a § 



P4 



00 



o 





o S 



3 £» 



3 P^ 



£ rt o 



u 







'o a 



CO ^ 



'-3 o 



.2 3 



43 O 



aiber of ] 

 pecies fou 

 o climati 



u 



3 - 





s > 



"C G 



'3 w 



3 CO H 



o 5 * -1 





^ 



pq 



PQ 



IH 



E-i 



Newton. Boulder-clay 



7 

 2 



8 

 10 



3 

 1 



38 

 31 



56 

 44 



Liverpool. ,, „ 



Dawpool. ,, ,, 



4 



7 





24 



35 



Upton. Middle Sands and Gravels 

 Macclesfield. „ ,, „ 



13 



25 



4 



93 



135 



2 



4 





17 



23 



2 



7 



2 



37 



48 



Ley lands. ,, ,, ,, 



2 



7 



1 



34 



44 



Blackpool. „ „ „ . 





3 



1 



18 



22 



6 



21 



4 



106 



137 



From this Table it will be seen that Arctic and Scandinavian 

 Mollusca are more common in the Boulder-clays than they are in 

 the Middle Sands and Gravels. Figures, however, do not give so 

 clear a notion of the importance of the relative absence of many of 

 the Scandinavian species from the Middle Sands and Gravels as may 

 be obtained from a study of the more detailed analysis, where each 

 species may be followed, and its frequency or infrequency through- 

 out the drift deposits observed. 



In the accompanying lists of the Mollusca, the Lancashire locali- 

 ties I have taken from the Memoir of the Geological Survey " On the 

 Superficial Geology of the Country adjoining the Coasts of South- 

 west Lancashire," by C. E. De Eance, Esq., E.G.S. I have com- 

 pared, however, the Blackpool, Leylands, and Liverpool lists of 

 shells with the published lists of E. D. Darbishire, Esq., B.A., 

 E.G.S. (Geol. Mag. vol. ii. p. 298 ; Quart. Journ. Geol. Soc. vol. xxx. 

 p. 38), and T. Mellard Eeade, Esq., E.G.S. (Quart. Journ. Geol. Soc. 

 vol. xxx. p. 27), and I have corrected the errors which occur in the 

 lists of the Survey publication. 



I have to thank Mr. Darbishire for correcting his Macclesfield and 

 Moel-Tryfaen lists, published Geol. Mag. vol. ii. p. 298. 



The Mollusca from Newton were found by myself. 



The Mollusca from Upton were found by G. W. Shrubsole, Esq., 

 E.G.S., and myself. 



