Vol. 6S.'] SUCCESSION IN THE NORTH-WEST OP ENGLAND. 



451 



(a) Sbap and Eavenstonedale. (Type Districts.) 



(b) Arnside and Carnforth, 



(c) Kendal and Kirkby Lonsdale. 



(d) Grange and Furness. 



(c) The Westmoi-land Pennines and Middleton-in-Teesdale, 



These districts, althougli they once formed portions of a con- 

 tinuous area of deposition, are now separated one from the other 

 by tracts of Lower Palaeozoic rocks, as the combined result of 

 faultinor and denudation. 



Fig-. I. 



INDEX-MAP OF 



DISTRICTS 



\^m>a ilvcndal \seclbergh A _ 



1 m^Y-r: J 



= , "^ ^ \ \r, itif,^^ — f\ !• Ivirkbv! ' 



DISTPICT-^/r HI ^^ '-i ' "^J 



J/ MOREC IM nL ^X' y°' "> 



H iit,055,Green 





\ 



The Shap and Ravenstonedale Districts are taken as the type 

 districts for the area described, since they contain the complete 

 sequence from the lowest horizon met with in the JSTorth- Western 

 Province to the Millstone Grit. It was also in these districts 

 that the zonal divisions were first established in detail. 



In the accompanying table (fig. 2, p. 452) are set out the fossil 

 forms which have been found most useful as indices for the different 

 zones, sub-zones, and bands, on account of their wide distribution 

 over the area dealt with. 



