CHAPTER IV. 



SUMMARY OF THE PRESENT KNOWLEDGE OF THE FORMATIONS. 



The data under this heading is assembled for each of the following 

 Geologic Provinces : 



Atlantic Coast Province. 

 Appalachian Province. 

 Rocky Mountain Province. 

 Interior Continental Province. 



A brief resume" is given at the end of the description of the forma- 

 tions of each province and a general resume of the Cambrian Group at 

 the end of the chapter. 



ATLANTIC COAST PROVINCE. 



■ 



This includes the rocks referred to the Cambrian group on the Island 

 of Newfoundland and the adjoining coast of Labrador, the provinces 

 of Nova Scotia and New Brunswick, and Cape Breton, and the States 

 of Maine, New Hampshire, aud eastern Massachusetts. 



• 



NEWFOUNDLAND AND THE ADJOINING COAST OF LABRADOR. 



The detailed knowledge we have of the Cambrian rocks of Newfound- 

 land is obtained largely from the publications of the Geological Survey 

 of Canada for the northwest and west coast and the Labrador coast, 

 aud from the descriptions by the Newfoundland Survey of the eastern 

 and southeastern coast. To the latter there is added the results of a 

 season's work on the Avalon peninsula, by the writer. 



NORTHWESTKKN NEWFOUNDLAND. 



The Cambrian strata on the adjoining coast of Labrador are included 

 with those of the Cambrian area of northwestern Newfoundland, as 

 the two are considered to belong to one geologic province. 



The section at L'Ause au Loup, on the north side of the straits of 

 Belle Isle 1 shows 231 feet of arenaceous beds at the base, overlaiu by 



'Logan, W. E. : Geological Survey of Canada ; report of progress from its commencement to 1863. 

 Montreal, 1863, p. 288 f 



253 



