166 
MR. C. BARRINGTON BROWN AND PROFESSOR J. W. JUDD 
ft. in. 
2nd Twinlone I had snnk. 
1. Yellow clay.IS 0 
2. Yellowish ruby-bearing sand and gravel.12 0 
30 0 
This pit did not reach the bottom of the ruby-bearing sand, but the 
miners refused to sink deeper. 
Twinlone G. 1. Yellow clay and sand, with black sandy loam.13 6 
2. Grey sand with gneiss pebbles forming the ruby-bearing 
portion.16 
15 0 
Twinlone H. 1. Yellow and red clay and loam.22 0 
2. Yellowish ruby-bearing sand, with gneiss, pegmatite, and 
quartz gravel.3 6 
25 6 
3. Yellow micaceous under-clay. 
Twinlone K. 1. Red and yellow stiff clayey loam . ..• . 13 0 
2. Yellow ruby-bearing sand, with large blocks of pegmatite 
and pebbles of gneiss.2 0 
15 0 
3. White floury micaceous under-clay. 
Twinlone M. 1. Brown and grey loam and clay. 
2. Ruby-bearing sand, with gneiss pebbles of variable thickness. 
12 0 
The alluvial deposits at Nyoungouk, and along the northern side of the Mobay- 
choung from Nayo, are of two ages; one being the recent alluvium forming the flat 
valley of the river, and the other an old river gravel deposited at a higher level, 
which is seen at the base of the hills. This latter is composed almost entirely of 
quartz and quartzite gravel, which, in some places, is semi-consolidated by the 
percolation of water, charged with oxide of iron, derived from the red loam resting 
upon it. This covering is in part a hill wash derived from the mountain sides. The 
base of the old gravel is generally on a level with, or above the level of, the surface 
of the present river alluvium. 
The latter is composed of a dark loam on grey clays and sands, as seen in the 
river banks. 
In the extensive Hmyaudwin cuttings, on the north side of the river, fair sections 
of the old gravel are seen, where it has been worked for rubellite. One of these, at 
the foot of the hills, exposes the following section :— 
