1865.] Science in Canada. 521 



paper by Professor Hind, of Toronto, on the " Drift of Labrador, 

 &c. ; " ' Quarterly Journal, Geological Society,' vol. xx., p. 122, May 

 1864 ; and ' Canadian Naturalist ' for Aug., 1864.] Dr. Grant next 

 describes the " rock-basins " or " pot-boles," wbicb are everywhere 

 common along rapid brooks and rivers, and are most frequently seen 

 on elevated ground. Two of considerable dimensions occur near 

 Ottawa, one being three feet in diameter and thirteen in depth, the 

 other ten feet in diameter and fifteen to twenty in depth. 



Geology of Eastern Neio York. — Dr. T. Sterry Hunt gives, in the 

 ' Canadian Naturalist,' a short account of the results arrived at by 

 Professor James Hall and Sir William E. Logan, in the examination 

 of the rocks of Eastern New York, with the object of comparing them 

 with Canadian formations. These gentlemen succeeded in recognizing 

 the Sillery and Quebec groups in that region, and also in identifying 

 the gneissic district of the Highlands of the Hudson with the Lawren- 

 tian system of Canada. This conclusion agrees with the observations 

 of Professor Cook, and of Vanuxem and Keating, according to all of 

 whom the gneiss and crystalline limestones of Orange County and 

 of New Jersey underlie unconformably the Lower Silurian strata. 



The Gold of Nova Scotia. — Mr. G. F. Hartt shows that, in Colches- 

 ter County, N.S., auriferous clay-slates, similar to those of the other 

 gold districts of the province, are overlaid unconforcnably by sand- 

 stone, grit, and conglomerate of Carboniferous, probably Lower Coal- 

 measure, age. At the junction the conglomerate and grit are richly 

 auriferous — the greater part of the gold mined in the locality being 

 obtained from the conglomerate. The inference is drawn that the 

 gold is of pre-Carboniferous age, both in that locality and elsewhere 

 in the province. 



Tracks and Feet of Trilobites. — At a meeting of the Canadian 

 Natural History Society, held on September 26th, 1864, two interest- 

 ing and important papers were read, bearing on the nature of Trilo- 

 bites. The first was by Principal Dawson, on the genus Rusophycus. 

 This genus was established by Professor Hall, for certain transversely 

 wrinkled impressions found in the Clinton group and Chazy sand- 

 stone, and supposed to be fucoids." Mr. Billings thus describes the 

 species found in the Chazy sandstone of Grenville :— " This species 

 (R. Grenvillensis) is found in the form of irregular, oblong-ovate, or 

 depressed hemispherical masses, one end usually divided into two 

 parts by a furrow of more or less depth. The whole mass is generally 

 crossed by numerous undulating wrinkles, which have a transverse 

 direction to that of the furrow. The more common dimensions are 

 from three to four inches in length, and from two and a-half to three 

 and a-half in breadth, but occasionally specimens occur much larger 

 and also smaller ; one of them is nine and a-half inches by five and 

 a-half, and, in addition to the principal groove, exhibits two or three 

 obscure furrows on each side." Dr. Dawson adds that the longitudinal 

 furrow is always more strongly marked at one extremity of the fossil, 

 and that there is no indication of a stem or stalk. From an examina- 

 tion of 'the fossils in situ, Dr. Dawson concluded that they were casts 

 of hollows or holes excavated in clay, and afterwards filled with sand. 



