APPENDIX A. 



COUESES OP GLACIAL STRI^. 



The following- tuble of glacial striii' in the region of Hudson Bay and Lake 

 Superior and westward shows the directions of the currents of the ice-sheet within 

 the basin of Lake Agassiz and upon the country where it lay as the barrier or dam 

 of this hike. The notes are derived chiefly from the reports of the geological and 

 natural history surveys of Canada and of Minnesota, and are all reduced to refer 

 to the true or astronomic meridians. Unless they are otherwise credited, the obser- 

 vations in British America are by Dr. Eobert Bell, and in Minnesota and North 

 Dakota by the present writer. 



The lobation of the ice-sheet in this basin, its diverse and prolonged courses of 

 transportation of drift, which depended on the glacial currents ])roduciug the strite, 

 and the intersection, in some localities, of two or more sets of striation, have been 

 considered on pages 129-131. Besides the citations on these subjects there given, 

 reference may be made to my recent papers on remarkably deflected striation in 

 Somerville, Mass.,' and in the vicinity of Two Harbors, Duluth, and Carlton, Minn,^ 



nndson Strait and Bay. 

 Hudson Strait: 



Port Burwell, 10 miles southwest from Caiie ChuiUeigli S. 85° E. 



Aslies Inlet, ou the north side of the strait, about S. 65° E. 



Cape Prince of Wales, on the south side, opposite to the last E. to N. 70° E. 



South part of Nottingham Island S.80° E. 



Digges Island, oif Cape Wolstenholme N.55°-75° E. 



Ottawa Islands, in the northeast part of Hudson Bay N. 75° E., N. 40°-20° E., and N. 5° W. 



East coast of Hudson Bay : 



Northern part, successively, proceeding southward NE., N.,audNW. 



From Cape Dufferiu southward to Hopewell Head and the most northern of the Nas- 

 tapoka Islands, in latitude 58° to 57° N., near the middle of the east side of Hudson 



Bay, numerous localities S. 70°, 60°, and 35° W. 



[It is probable that the first two of these courses record the direction of the 



ice-flow during the time of maximum depth and area of the ice-sheet, or daring 



a somewhat later stage ; and that the last belongs to the time of final melting of 



tlie ice.] 



Thence southward to the entrance of Richmond Gulf, numerous localities, mostly 



between S. Ii5 -75 W. and N. 75° W. 



But in two localities, probably a later glaciation S. ,S5°-45° W. 



Cairn Mountain Island, Richmond Gulf, several localities, mostly N. 60°-70° W. 



But in one place varying from this to S.45° W. 



' Proc. Boston Soc. Nat. Hist., Vol. XXVI, pp. 33-42, March 1.5, 1893. 



-Geol and Nat. Hist. Survey of Minnesota, Twenty-second Annual Report, for 1893, pp. 31-13, with 

 map of the glacial geology (striae retreatal moraines, etc.) of northern Minnesota. 



633 



