508 THE GLACIAL LAKE AGASSIZ. 



the sea along- the coast north of Cape Cod, exceptmg isolated colonies.^ 

 The coast had been reelevated soon after the retreat of the ice-sheet and 

 before the southern inollusks mig-rated northward, for in the extensive lists 

 of the fossil fauna of the Chaniplaiu beds, als(^ denominated in tlieir two 

 principal phases the Leda clays and Saxicava sands, none of the southern 

 species is included, excepting- perhaps the oyster in southwestern Maine." 



Postglacial elevation of the country along- the f]ast Main coast of 

 Hudson Bay and on Hudson Strait is shown bv conspiciious raised beaches, 

 according- to Dr. Roljert Bell, up to heights of at least 300 feet, while prob- 

 ably others much higher exist farther inland.^ In the region draining- from 

 the southwest to James Bay Dr. Bell reports marine shells in stratified 

 beds overlying the glacial diift along the Moose, Mattagami, and Missinaibi 

 rivers up to about 300 feet above the sea;* along the Albany and Keno- 

 gami rivers up to a height of about 450 feet ; ^ and on the Attawapislikat to 

 about 500 feet above the sea.'' It is also e-vident that the shores of Hudson 

 and James bays are still undergoing elevation, this being- proved by the 

 fresh appearance of the raised beaches, by driftwood far above the limit 

 of the highest waves in storms, and by the gradual shoaling of harbors. 

 The rate of emergence of the eastern coast is estimated by Bell to be 

 between 5 and 10 feet in a century; Outer Digges Island, at the entrance 

 of Hudson Strait, has risen 70 or 80 feet since it was inhabited by Eskimos; 

 and the rise of the mouths of the Churchill, Nelson, and Hayes rivers seems 

 to be similarly rapid, being estimated at about 7 feet in a hundred years.'' 



In British Columbia the reelevation following the Charaplain depres- 

 sion was probably completed within a short time, geologically speaking, 



'Proc, Boston Soc. Nat. Hist., Vol. XXV, 1891-92, pp. 305-316; also Am. Jour. Sci. (3), Vol. XLIII, 

 pp. 201-209, Mareh, 1892. 



2C. H. Hitchcock, "The geology of Portland," Proc, A. A. A. S., Vol. XXH, for 1873, pp. 1G3-175. 

 A. S. Packard, Jr., "Observations on the glacial phenomena of Labrador and Maine," Memoirs of the 

 Boston Society of Natural History. Vol. I, ISfin. pp. 210-262. J. W. Dawson, "Notes on the Postpliocene 

 geology of Canada," 1872, pp. 112 (from the Canadian Naturalist, new series. Vol. VI). 



=Geol. and Nat. Hist. Survey of Canada, Report of Progress for 1877-78, p. 32 C; for 1882-83-84, 

 p. 31 D. 



<Ibid., Report of Progress for 1875-76, p. 340; for 1877-78, p. 7 C. 



•■'Ibid., Report of Progress for 1871-72, p. 112; for 1875-76, p. 340; Annual Report, new series. Vol. 

 n, for 1886, pp. 34 and 38 G. 



« Ibid., Annual Report, Vol. II, p. 27 G. 



' Geo], and Nat. Hist. Survey of Canada, Report of Progress for 1877-78, pp. 32 C and 25 CC ; for 

 1878-79, p. 21 C ; for 1882-83-84, pp. 2G, 30, 32 DD ; Annual Report, new series, Vol. I, for 1885, p. 11 DD. 



