86 
GEOLOGICAL FEATURE OF SINGAPORE* 
The specimens of these granites on both hills shew 
1. Dark bluish quartzose granite, the mica hardly visible, the 
quartz being white, 
2. Grey granite, about two thirds of the mass lameller whitish 
quartz. 
3. Dark bluish granite, close grained and quartzose, fracture of 
the quartz lamellar, 
4. Very dark and compact granite, looking externally a good 
deal like basalt. 
5. Granite on Scott’s Hill, very quartzose and coarse grained, 
rest of a dark colour. 
But, as I shall have again to notice, the general features of the 
sandstone strata induce me to believe that any upheaving force to 
which they may have been subjected, must have been* exerted at in¬ 
tervals, and have been of varying intensity. 
I found a coal black stratum at the foot of Bukit Timah, in the* 
alluvial or delrital level, of a substance which, if I may be allowed the 
expression, I will call an anthracitical compact clay. When expos¬ 
ed to a red head in a crucible and exposed to the air, and the carbo¬ 
naceous inllamable substances had thus been dissipated, the clay 
was found to have lost about three fifths of its weight, and the re¬ 
siduum was a biscuit of white felspar or a light brown earth. 
THE SANDSTONE AND CLAYEY STRATA. 
In so far my observations has extended, these strata are not 
overlaid by any other rocks; while it would be impossible without 
boring deeply for doing which wejiave no facilities in this country, 
to ascertain on what stratum they rest. Without the guage there¬ 
fore which would be supplied were other stratified rocks associated 
with them, I shall only hazzard an opinion, founded on their general 
aspect, that they do not belong to the latest sandstone formation. The 
total absence of organic remains, at least in so far as my experience 
has gone, and also of the usual concomitants of the fossiliferous and 
carboniferous series, would be in favour of this’supposition. Does 
this sandstone belong to the group which lies immediately under the 
oolitic? I should be inclined to think that it does, w ere it fossili¬ 
ferous. 
There is one difficulty however. How does it happen that hard 
