212 



STRUCTURAL GEOLOGY OF NORTH AMERICA 



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Fig. 13.8. Representative cross sections of Newfoundland. Section 4A and 4B after Walthier, 

 1949; section 5 after H. Johnson, 1941. 



Humber Arm series of the Ordovician. 



The upfaulting of Long Range on the west started in early Mississip- 

 pian time and resulted in the deposition on the downfaulted block of the 

 coarse Anguille series. Movement continued during the deposition of the 

 entire Mississippian and Pennsylvanian sequence, or at least recurred 

 after the Mississippian sediments were deposited, because the Precam- 

 brian is now in fault contact with the Mississippian. Faulting recurred 

 after the Pennsylvanian Barachois beds were deposited. 



The structure along the east flank of the Long Range uplift is illustrated 



in sections 3 and 5, Figs. 13.7 and 13.8. High-angle thrust faulting seems 

 the dominant structure, but probably a large syncline or synclinorium 

 exists between the mainland and Groais Island. Groais and Bell islands 

 are presumably Precambrian schists and gneisses, and hence are believed 

 to mark an anticlinal fold. 



Representative of the folding and faulting in the Notre Dame Bay area 

 are sections 6 and 7 of Fig. 13.9. Through the islands and headlands of 

 Notre Dame Bay area, a system of faults with an east-west bearing oc- 

 curs. Those shown on the tectonic map were taken from a compilation 



