January 14, 1898.] 



SCIENCE. 



51 



sected also, but not so deeply, by a series 

 of small parallel west-east gorges or ravines, 

 in one of which, the Jamesville gorge, the 

 lake is situated. The immediate vicinity of 

 the lake is channeled in a complicated man- 

 ner by abandoned stream beds which run 

 west-east, and whose sides are often ter- 

 raced in such a manner as to make it evident 

 that large quantities of water once passed 

 across this region. Associated with these 

 channels a number of kettle-like depressions 

 are found, of round or oval outline and of 

 varying dimensions. It is in one of the larg- 

 est of these that the present Jamesville lake 

 is situated. The lake basins were explained 

 as probably caused in each ease by a water- 

 fall, which had hollowed out a depression 

 or great pool at its foot. 



The paper was discussed by W. M. Davis, 

 who corroborated, from his own observations 

 in the region, the views of the author ; by 

 H. L. Fairchild, who commented on the 

 altitudes, and by F. B. Taylor, who con- 

 nected the streams with the drainage of the 

 glacial Lake "Warren. This led to some 

 estimate of the probable size of the river, 

 and it was stated by A. P. Brigham and 

 W. M. Davis to have been less than the 

 present Niagara. 



Notes on the Moraines of the Georgian Bay 

 Lobe of the Ice-sheet. Frank B. Taylor, 

 Fort Wayne, Ind. 



When the ice-sheet had retreated in the 

 basin of Lake Huron so far as to leave the 

 summit of Blue Mountain south of Georgian 

 Bay uncovered, there still remained a well 

 defined glacial lobe projecting towards the 

 southeast nearly to Toronto and eastward 

 beyond Lake Simcoe. This lobe was divi- 

 ded in two parts by the Penetang peninsula, 

 the larger one extending southeast from 

 Nottawasaga Bay, and the smaller one ex- 

 tending east-southeast from Matchedash 

 Bay. Recently the moraines of the eastern 

 limb of the Nottawasaga lobe were par- 



tially explored and a well defined series 

 of five was found filling the interval from 

 the head of Georgian Bay to the ' Oak 

 Ridges ' north of Toronto. During the later 

 stages of this lobe there was a glacial lake 

 covering Lake Simcoe and a considerable 

 area to the east, and probably held up on 

 that side by a lobe projecting from the 

 northeast up the valley of the Trent River. 

 Its beach is 90 to 100 feet above the Algon- 

 quin beach, a few miles northeast of Barrie. 

 Well marked glacial strise were found on 

 the summit of the promontory of Blue 

 Mountain, over 1,100 feet above Georgian 

 Bay, running S. 60°E. Some of the moraines 

 running along the east side of Lake Huron 

 were also traced northward to the vicinity 

 of Durham and Flesherton. 



T. C. Chamberlin inquired regarding the 

 direction of the glacial strise as bearing on 

 the views advanced, and the speaker replied 

 that they bore S. 60° E. wherever visible. 

 This brought out the observations of H. M. 

 Ami that strife in Ontario to the southwest 

 of this region run southwest, and Robert 

 Bell stated that they run southeast on 

 Georgian Bay, but that at its north end they 

 change to southwest. Robert Chalmers re- 

 ferred to the ridges, like drumlins, along 

 Lake Ontario, on the line of the Pacific 

 Railroad, and remarked that the associated 

 striae were variable from southeast to south- 

 west. I. C. White asked about the height 

 of the old Algonkian beach above Lake 

 Simcoe, and F. B. Taylor replied that it 

 was about 100 feet above the lake, which 

 latter is 720 feet above tide. 



Notes on the Geology of Montreal and Vicinity. 



Frank D. Adams. 



By means of the geological sheets of the 

 Canadian Survey, Dr. Adams outlined the 

 extent of the several formations from the 

 old Laurentian gneisses, anorthosites and 

 crystalline limestones on the north across 

 the Paleozoic plain to the south. He gave 



