BY L, A. COTTON. 823 



also found to be diamond-bearing'. A little free gold has been 

 found in this deposit. 



The bottom layer of wash is made up of granite-boulders, from 

 2 to 4 inches in diameter. These range from subangular to per- 

 fectly waterworn, ellipsoidal stones. This band also contains 

 quartz and tourmaline pebbles, and is about one foot in thickness. 

 About one foot above this band, are a number of waterworn 

 pebbles, decomposed to a soft bluish clay. These are mostly about 

 an inch in diameter, but occasionally are of larger size. 



Another occurrence of considerable interest is that known as the 

 Round Mount. This is, as the name implies, a small, round hill, 

 possessing a capping of basalt from 10 to 20 feet in thickness, and 

 a series of river-gravels about 25 feet in depth. These gravels are 

 isolated, and their position has given rise to much speculation. 

 There is a ridge of granite separating them from the deposits 

 at the Deep Shaft and the Streak of Luck. The internal evidence, 

 as deduced from the slope of the bottom of the gravels from tlie 

 edge to the centre of the channel, and also from the arrangement 

 of the pebbles, indicates that the direction of the stream was from 

 west to east at this point. On the northern side, and at a distance 

 of about 100 yards, is another patch of river-gravels, also capped 

 by basalt. The basalt is continuous between the two outcrops of 

 gravel. At this place, the direction of the stream is to the south- 

 east. The w^ash consists chiefly of quartz-pebbles from 4 mm. up 

 to 4 cm. in diameter, with tourmaline, topaz, and garnet. A num- 

 ber of bluish boulders, from 2 cm. up to 20 cm. in length, re- 

 sembling those of Soldier Hill, are also present. The isolated 

 position of the Round Mount, and the fact that its river-gravels 

 are at the same level as those of the Deep Shaft, have rendered 

 the problem of determining the relation of the Round Mount, to 

 the main Tertiary stream, a difficult one. The solution of the 

 problem is to be found from the following facts. The trend of 

 the lead at Soldier Hill is in a southerly direction, and, between 

 this place and the Round Mount, occur the redistributed river- 

 gravels at the football-ground. Again, the small patch of gravels, 

 to the north of the Round Mount, is in the line of these occur- 



