CONTROLLED FRACTURE FIELDS OF NORTH AMERICA 



151 



Ontario to the eastward of Lake Huron, for lowa,^^ and for portions of 

 Arkansas.^® 



Figure 26. — Map showing oriented Drainage of the French River District, Ontario 



That the same directions also control in many districts scattered 

 throughout the United States is indicated by a considerable body of evi- 

 dence presented by the writer in 1905.^^ 



37 W J McGee : Note on jointed structure. American Journal of Science, 3d ser., vol. 

 25, 1883, pp. 152-155. Also Transactions of the Wisconsin Academy of Science, vol. 15, 

 p. 21. 



38 J. F. Newsom and .7. C. Branner : The Red River and Clinton monoclines. Ameri- 

 can Geologist, vol. 20, 1899, pp. 1-13. 



^ The correlation of fracture systems and the evidences for planetary dislocations 

 within the earth's crust. Transactions of the Wisconsin Academy of Sciences, vol. 15, 

 1905, pp. 15-29. 



