W. H. Hobhs— Post-glacial Faulting. 507 



Art. XXXYIII. — Post-glacial Faulting in the French 

 Biver District of Ontario; by William Herbert 



HOBBS. 



In the early fall of 1919 the writer made a canoe journey 

 in. the French Riyer district of Ontario, where he had occa- 

 sion to note an importance of post-glacial faulting quite 

 beyond anything which he had seen described in print. 

 Among the geologists who haye giyen some attention 

 to this subject are Woodworth^ and Matthew.^ 



The district under consideration is one of yery pro- 

 nounced glacial erosion by the combined processes of 



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Fig. 1. — Polished surface on gneiss. French river district. 



plucking and abrasion. Eyery shore of the channels and 

 every island is modeled into drumlinoid forms and the 

 glistening surface of the rock betrays no trace of weather- 

 ing {-^g. 1). Rarely is there found sufficient coyer for 

 the use of tent-pegs about camp, and the forest trees must 

 often gain their foothold in the creyices of the rock. 

 Planings and scorings, as well as the glorified roches 



^ J. B. Woodworth, Post-Glacial Faults of Eastern New York, New York 

 State Museum, Bull. 107, pp. 14-28, 1907. 



- G. F. Matthew, Movements of the Earth 's Crust at St. John, N. B, in 

 Post-Glacial Time, Bull. Nat. Hist. Soc. New Brunswick, no. 12, 1894, pp. 

 34-42. (See also the author's '^ Earthquakes, " Appleton, 1907, pp. 219- 



