REPORTS OF COMMITTEES. 271 



and measures 19ft. by 16ft. by 10ft. high, which has also been much 

 reduced by exfoliation. The white sand and clay, which form the finer 

 part of the morainic material, pass over the saddle of this ridge into 

 the valley of the Deep Creek on its northern side, where the ploughed 

 land on the slopes is very light and of a wliite sandy nature. 



The Deep Creek Valley is bounded on the north side by lofty hills 

 of lower Cambrian and Pre-Cambrian rocks, which appear to have 

 formed the limits of the ice flow on that side. On the south side is the 

 much lower ridge, known as Martin's Hill (Section 145). The creek is 

 responsible for the removal of much of the morainic material from the 

 sides and bottom of the valley, and has obscured the deposits by al- 

 luvial laid down from flood waters. 



A small tributary, in Section 87, exposes the glacial beds at its 

 bottom, with numerous boulders in the creek and on the slopes ; and on 

 the dividing ridge between this creek and the Duck's Nest Creek are 

 several granites, measuring respectively 5|ft., 4|ft., and 4ft. One 

 hundred yards south of these there is a large erratic fractured in two, 

 12ift. X 9ft., covered up, apparently, to a considerable depth. A 

 spur of the older rocks here projects into the valley, having a rounded 

 contour, though much fractured at the surface. 



Lower down the valley from the point just indicated there is a 

 long, rounded ridge of sand, 50ft. high, which runs up from Mr. J. 

 Crossman's, in Section 404, to a high level on the road which crosses 

 the ridge from Inman Valley. One large erratic is seen on this sand 

 ridge, not far from Crossman's, 7ft. by 2Mt., and contains inclusions 

 of schist like those at Granite Island. This is the only large erratic I 

 saw in Deep Creek Valley. 



The Deep Creek, as a rule, runs through alluvial flats of its own 

 formation, but at a point (in Section 361) where the creek makes a 

 sharp horseshoe bend to the south it has cut deeply into the morainic 

 material. The bottom of the creek is in yellow, grey, and white clays, 

 with sands, in which the water has cut deep ruts and potholes, and cut 

 back into a cliff of glacial beds 20ft. high. The clays are irregularly 

 deposited in heaps and vertical bands. A few erratics are present, but 

 I saw none at this spot of any considerable size. The Deep Creek 

 Valley curves round to the south-west and unites with the main Inman 

 Valley. 



The localities described in these notes formed nart of the northern 

 edge of the great Inman Glacier, and the number and great size of the 

 erratics which occur along this line may in a great measure be explained 

 by this fact. 



The morainic ground-mass of the district described, as of most of 

 the Inman Valley glacial beds, consists principally of a yellowish sandy 

 clay, or argillaceous sands, with coarse granitic grits in places. This 

 is what might be expected. From the dominant part which granite 

 rocks make in the erratics carried it may be assumed that the snow- 

 fields and upper glacial valleys were largely in granitic country, and one 

 that had already been rendered, to a great extent, rotten and friable 

 through weathering. Such a surface would readily yield to frosts, water. 



