APPENDIX I 



In order to avoid the necessity of correlating the American and 

 foreign geological subdivisions, comparatively few names of the 

 latter have been mentioned in the text, because such correlations, 

 in the present state of knowledge, can seldom be made with con- 

 fidence. Subjoined are tables of the more important European 

 formations. 



CAMBRIAN SYSTEM 



ENGLAND 





SCANDINAVIA 



Upper Cambrian, 







Olenns or Dicellocephalus 



► Lingula Flags. 



Olenus Shales. 



Beds. 







Middle Cambrian 

 or 



Menevian and 

 Solva. 



Paradoxides Beds. 



Paradoxides Beds. 





Lower Cambrian 



or 

 Olenellus Beds. 



Caerfai. \ 

 1 



Fucoid and 

 Eophyton Sandstone. 



OR 



DOVICIAN SYSTEM 



ENGLAND 





SCANDINAVIA 



Bala. 





Brachiopod Shales. 

 Trinuclens Shales. 



Llandeilo. 



. 



Chasmops and 

 Cystidean Limestones 



Llanvirn. 

 Arenig. 





Orthoceras Limestone. 



Tremadoc. 



S 



ILURIAN SYSTEM 



Ceratopyge Limestone. 



ENGLAND 





SCANDINAVIA 



Ludlow. 







Wenlock. \ 





Gotland Limestone. 



Llandovery. J 







541 



