128 
NOTES ON THE PETROLOGY OF STONE IMPLEMENTS 
FROM THE FEDERATED MALAY STATES. 
By J. B. SCRIVENOR, r.e.s. 
TEMBELING VALLEY, PAHANG.—AÀ v ery fine grained sili- 
. us with aghistoss structure xs marked by dark, 
"mined 
is quartz in minute grain There are also, however, larger, angular 
fragments of quart throughout. In the е} 
a large development of biotite in minute flakes. Only a few of 
these are > big enough to give the кузне чи clearly «Азы a one 
quartz are elongated edi the Vnd of schistosity. 
З. TEwBELING VALLEY, Panane.—Specifie gravity 2.74.— This 
again is а very fine тее siliceous mk with larger angular fragments 
of quartz. The colour of he: section is pale chestnut-brown, occasion 
by the abundance of otite in minute flakes. А black dust is 
u 
vin mott. 
appearance ; and there is also a colourless mineral, diu PUE M 
with а = Finer index, in granules too small for determina 
LING VALLEY, PAHANG.—Specific gravity 2.77.— 
alone of all the implements examined shows mark weathering 
externally. Under a high Е a minutely granular mineral with 
high refractive index is also seen. There is no trace of schistosity. 
5. Кемват, Е. 112-05 —A fine grained siliceous rock with angular 
fragments of quartz in a fine quartzose groun 8 histosity is 
. Biotite i i 
be 
and associated with one of them is a colourless mineral wit igh 
refractive index. It is not sufficiently abundant or in large enough 
grains to be determined. 
6 AND 7. TEMBELING VALLEY, Panane.—No. 6 Specific gravity 
2.75. Мо. 7 Specific gravity 2.73. 
All these specimens of stone implements are composed of a meta- 
morphosed, fine grained siliceous sediment, characterised by the 
abundance of biotite in minute flakes. The white appearance of the 
exterior of No. 4 is due, I believe, to the removal by solution of some 
of the siliceous material. This results in a pitted, irregular surface 
