104 



SCIENCE. 



[N. S. Vol. XI. No. 264. 



stratification lines from the banding due to 

 pinched crevasses and to other causes, and 

 discussed the differences of Agassiz and 

 Forbes regarding these phenomena. Bailey 

 Willis commented on the close parallelism 

 between ice movement and rock movement 

 and inquired regarding the phenomena of 

 movement. Dr. Reid replied that there 

 was no shearing at all, but that plasticity 

 sufficed to explain all the observed phe- 

 nomena. 



A channeled drumlin. By H. L. Faiechild, 



Eochester, N. Y. 



A few lantern views showed a longitudi- 

 nal hollow (channel?) in a drumlin termi- 

 nating at the lower end by a transverse cut. 



The phenomena had puzzled the writer 

 and after illustrating them he appealed to 

 the Society in vain for an explanation. 



Distinction between Upper and Lower Huronian. 



By A. P. Coleman, Toronto, Canada. 



During the past summer a band of rock 

 consisting of fine-grained sandstone, chert 

 or jasper, with interbedded iron ore, has 

 been found at Michipicoton, on the north- 

 east shore of Lake Superior, corresponding 

 to the Yermilion and other iron-bearing 

 series west and south of Lake Superior. 

 This band has been traced for 30 or 40 

 miles, and has been recognized at various 

 points to the west as far as Rainy Lake 

 and east to Lake Temagami. It is the most 

 easily determined member of the Lower 

 Huronian. Many fragments of this sandy, 

 cherty or jaspery rock are found, as well- 

 rounded pebbles in conglomerates of the 

 Upper Huronian, at Gros Cap, a few miles 

 west of Michipicoton, and at other points as 

 far west as Shoal Lake and east as Lake 

 Temiscaming, a distance of more than 600 

 miles. Jasper and other pebbles of these 

 rocks furnish an easily applied test of the 

 Upper Huronian, since their materials can 

 have come only from the Lower Huronian. 

 The basal conglomerates near Thessalon 



and also on Lake Temiscaming contain 

 jasper pebbles, and hence indicate only the 

 base of the Upper Huronian. This far- 

 reaching break between the two parts of 

 the series represents a great lapse of time, 

 as proved by the Shoal Lake conglomerate. 

 In discussion C. D.Walcott disclaimed a,nj 

 conflict in the meaning of Algonkian and 

 Huronian, making the former a much 

 wider and more inclusive term than the 

 latter. 



The Cambrian formation in the Atlantic province. 



By Chaeles D. Walcott, Washington, 



D.C. 



The work of Dr. G. F. Matthew and 

 the use of the term Etcheminian series, 

 by him, for a sedimentarj' series formerly 

 considered to be pre-Cambrian and to be 

 separated by a break from the Cambrian, 

 was reviewed. The presence of a strati- 

 graphic break between the Etchenimian and 

 Cambrian was found not to exist. The ap- 

 parent break is explicable bj^ folds. The 

 same relations were found in Newfoundland. 

 Views were shown illustrating the Smith's 

 Bay and Manuel's Brook localities. 



The Lower Devoniun aspect of the Lower Hei- 

 delberg and Oriskany formations. By 

 Chaeles Schucheet, Washington, D. C. 

 The Silurian of Murchison was compared 

 with the American equivalents. The De- 

 vonian of Sedgwick and Murchison has no 

 marked Lower Devonic fauna. The Lower 

 Devonic of Germany was summarized. The 

 Helderberg fauna is transitional to the 

 Oriskany, and these two constitute the 

 American Lower Devonic. 



The paper was read by J. M. Clarke and 

 the next three titles were taken up before 

 discussion was begun. 



The Silurian- Devonian boundary in North 

 America. By Heney S. Williams, N"ew 

 Haven, Conn. 

 The writer presented a discussion (a) of 



the principles to be used in determining the 



