247 



Plate XL. 



XJpper figure. — An erratic of black quartz showing glacial 7 

 polish, facets, and strise. Obtained in situ in the quarry near the 

 Square Waterhole, figured in Plate xxxviii. Half natural size. 



Lower figure. — Glaciated erratic of fine-grained schist, found: 

 in situ in road-cutting of glacial till west of Strathalbyn. (See 

 Plate xxxix.) The stone is faceted at diverse angles, and strongly 

 scored with stria?. Two-thirds natural size. 



Plate XL I. 



Glacial sandstone, with irregular pockets of boulders, forming 

 a cliff in the bed of the River Finniss, 3 miles above the railway 

 bridge. 



Plate XLII. 



Another river-cliff, near the one figured in Plate xli., com- 

 posed mostly of boulders, one of which (a granite boulder) measures 

 4 ft. 6 in. by 3 ft. Overlying the boulder-bed is a glacial sand- 

 stone showing contorted lines of bedding. 



Plate XLIII. 



Quarry in glacial sandstone, situated in the banks of the River 

 Finniss above the railway bridge. The upper portions of the 

 quarry face show strongly-curved bedding planes, and the more 

 compact stone develops similar evidences of contemporary distor- 

 tion when weathered. (See Plate xliv.) 



Plate XLIV. 



Photographic reproduction of the Finniss River sandstone, as 

 exposed in the stone pillars at the entrance to the Adelaide Uni- 

 versity grounds. The stone had been smoothly worked, but as the 

 result of weathering the original grain has been brought into 

 relief, and displays broken and crumpled planes of deposition. 



Plate XLV. 



Two microscopic sections of the Finniss River sandstone, 

 showing the sharp and angular forms of the grains. The finer 

 material is of the same kind, and has the features of a glacial 

 "rock-flour." Magnified 18 diameters. 



