66 



BIBLIOGRAPHY. 



1. Bailey, L. W., and Mclnnes, W. ; Geol. Surv. Can., 



Annual Report, vol. 5, 1890-91, 

 part M. 



2. Dresser, J. A Geol. Surv. Can., Map 34 A. 



3. Ells, R. W Geol. Surv. Can., Annual Report, 



vol. 3, 1887-88, part K. 



4. Logan, W. E Geol. Surv. Can., Geology of Canada 



1863. 



5. Logan, W. E Geol. Surv. Can., Report of Progress, 



1863-66. 



6. Richardson, J Geol. Surv. Can., Report of Pro- 



gress, 1866-69. 



RIVIERE DU LOUP. 



THE POST-GLACIAL MARINE SUBMERGENCE. 

 (J. W. GOLDTHWAIT.) 



At Riviere du Loup terraces and benches at various 

 levels on the slaty hillsides offer little that is reliable as an 

 index to the extent of marine submergence. In the 

 southwest part of the town, however, two rather delicate 

 gravelly beaches may be traced through the fields, at a 

 height of 372 feet. Inasmuch as this measurement at 

 Riviere du Loup harmonizes with those at other places 

 along the coast, lying on the same inclined plane, it seems 

 safe to accept it as the upper limit of submergence. This 

 agrees perfectly with the determination made by Baron 

 De Geeri n 1892* Just beyond the car shops a ditch 

 beside the Intercolonial railway showed in August 1912, 

 a very fine cross section of a shell bed 340 feet above sea 

 level. This is not only the highest occurrence of Pleisto- 

 cene marine shells east of Quebec, but one of the rare 

 instances of marine shells close to the upper limit 

 of submergence. The unusually large size of the Saxicava 

 arctica and the profusion of them in these old tidal flats 



*G. De Geer : On Pleistocene changes of level in eastern North America. Boston 

 Society of Natural History, Proc; vol. 25, 1892, pp. 454—477; and American Geo- 

 logist, vol. 11, 1893, pp. 22—24. 



