EOCKS OF THE ATLANTIC COA.ST OF CAIfADA, ETC. 



813 



England, <fec. 



Nova Scotia and New 

 Brunswick. 



Silurian. 



Ludlow, Weulock and Llandovery, 

 or Mayhill. 



Upper Arisaig Series, Nova Scotia ; 

 Mascarene Series, New Brunswick ; 

 Lower Arisaig, New Canaan and 

 Wentworth beds of Nova Scotia ; and 

 Eestigouche series, New Brunswick. 



Ordovician. 



Caradoc and Bala, with Snowdon 

 fel sites and ash-beds, Coniston and 

 Knock Series. 



Great felsite and trap-ash Series 

 of Borrowdale (Ward). 



Lower Llandeilo flags and shales, 

 Arenig Series, Skiddaw slates, &c. 



Upper Cobequid Series, slates, 

 felsites, quartzites, and greenstones. 

 Ordovician of Western and Central 

 New Brunswick. 



Lower Cobequid Series, felsites, 

 porphyrites, agglomerates, and mas- 

 sive syenite of Cobequids, Pictou, and 

 Cape Breton ? * 



Middle Grraptolitic or Levis Series 

 of Quebec and North New Brunswick, 

 part of Cape Breton Series ? 



Cambrian. 



Tremadoc slates and Lingula-flags. 



Menevian and Longmynd Series, 

 Harlech grits, and Llanberis slates. 



Caerfai Group of Hicks. 



Hun 



Pebidian Series (Hicks), containing 

 felsite, chlorite-schist, and serpentine. 



Matane or Cape Eosier Graptolitic 

 beds. Mire and St. Andrew's Channel 

 Series in Cape Breton ? 



Acadian Series of St. John, New 

 Brunswick. Quartzite and slate of 

 Atlantic coast of Nova Scotia. 



Basal Cambrian of Southern New 

 Brunswick. 



Huronian felsites, chloritic and 

 epidotic rocks of Southern New 

 Brunswick, Yarmouth, and of Cape 

 Breton in part. 



Older gneisses of Scotland and of 

 Scandinavia, Dimetian ? 



Laurentian. 



Gneiss, quartzite and limestone of 



St. John, Portland Group, gneiss of 

 St. Anne's Mountain. 



YI. The Erian, oe Devonian System. 



This formation, most largely and completely represented in the 

 great " Erie Division " of the Geological Survey of New York, which 

 occupies an immense area iu the district around the lake from which 

 it is named, and attains therein its maximum thickness and develop- 

 ment, appears on the eastern coast entirely in the form of sandstones 

 and shales, which may be compared with those of the Old Red Sand- 

 stone of Scotland and England. They differ entirely in mineral 

 character from the great limestone- and shale-deposits of the interior 

 of America, where, in the Province of Ontario, the Corniferous Lime- 



* It seems impossible at present to separate these perfectly from the 

 Huronian, in some localites at least. 



Q.J.G.S. No. 176. 3h 



