WILLIAMS.] J. W. DAWSON. 257 



3. A Millstone grit series consisting of coarse sandstones and shales with conglom- 

 erate, mostly of red colors. 



4. The Main or Productive Coal Measures, precisely similar in character to those 

 of Britain. 



5. A Permo- Carboniferous series, perhaps corresponding in age to the Lower Per- 

 mian of England, and consisting largely of Red sandstones with species of plants 

 characteristic in Europe of the Lower Permian, but including no limestones. 



The conditions of the Carboniferous are on the whole similar throughout North 

 America, except in the extreme West and locally in the Appalachian region ; but 

 in Nova Scotia, Newfoundland, and New Brunswick they are more nearly allied 

 to the British type, except in the abundance of red marls and gypsum in the lower 

 part. 



Bull. 80 17 



