OBSERVED STRIKES OF PRE-CAMBRIAN FOLDING AND FOLIATION 689 

 LABRADOR, NOVA SCOTIA, AND NEW BRUNSWICK 



In northern Labrador (A. P. Coleman, 1921) many observations show 

 a strongly predominant north-northeast strike of the pre-Cambrian rocks, 

 or at right angles to Euedemann's trend-lines. 



Late pre-Cambrian rocks in southern Nova Scotia (Faribalt, 1913) 

 are closely folded with east-west strike, thus making a high angle with 

 Ruedemann^s lines. 



Several narrow belts of pre-Cambrian rocks in southern New Bruns- 

 wick (Young, 1913) show a general northeast strike, but this seems to 

 be wholly due to infolding with Paleozoic strata, and data regarding the 

 pre-Cambrian are lacking. 



EASTERN CANADA 



Quebec. — In Quebec and Ontario there is probably more of a tendency 

 for Ruedemann's trend-lines to harmonize with actually observed strikes 

 of folds and foliation than in any other large part of the continent, but 

 even there the divergences are often conspicuous. 



In the general region about half way between James Bay and Lake 

 Saint John (H. C. Cooke, 1919), in the Opiwaki, Fathers Lake, Windy 

 Lake, Eau-Jaune, Kenoniska, Mettagami, Pontiac, and Brock areas, the 

 whole region appears to have been folded (but by no means everywhere 

 severely) with a general east-west to south 75 degrees east strike, but 

 with some important local variations. 



In southern Argenteuil County, about 50 miles west of Montreal 

 (M. E. Wilson, 1917), there is a persistent strike of north 10 to 30 de- 

 grees east. 



The Lake Saint John area (Dresser, 1916) shows a general strike 

 about north 10 degrees west for the older pre-Cambrian rocks and about 

 north 30 to 40 degrees east for the younger ones, the older structure lines 

 in this case being almost at right angles to Ruedemann's trend-lines. 



In the large Harricanaw area (Tanton, 1919), about half way between 

 James Bay and Lake Temiskaming, most of the strikes range from north 

 20 degrees west through northwest to nearly east-west. 



Ontario. — The large, carefully studied Haliburton - Bancroft area 

 (Adams and Barlow, 1910) of southeastern Ontario shows a general 

 north 30 degrees east trend of batholiths and folding, though there are 

 many local variations in the folding, w^hich is of only a moderate degree. 



The Geneva-Sudbury area (Tanton, 1920) shows considerable folding 

 with a northeast strike. 



Not far north of Sudbur}^, however, in the Onaping area (Collins, 

 1917), the structure lines persistently run northwest, or at right angles 



