416 MINERALOGICAL DESCRIPTION OF TIIE ISLAND OF BANKA. 
been constructed. Having left the district of the mines the road 
leads through a thick forest, the soil of which is a deep, black, ve¬ 
getable mould. The country is on the whole descending. Besides 
several extensive veins consisting of fixed rocks of Red-Iron-stone, 
I observed fragments of this stone wherever the stratum of soil was 
removed by a current of water. In the stockade of Sungie-bulu 
were collected several large fragments of Sand-stone, of the same 
colour and constitution as that found at the last mine above men¬ 
tioned : upon examination I found that they were brought from the 
foot of the hill Pari-pari, where this kind of stone is found in abun¬ 
dance. I obtained by means of the natives several specimens from 
their natural situation. The stockade of Sungie-bulu is built in the 
alluvial district, the confines of which will more accurately be point¬ 
ed out in future. 
I proceeded from here to Kampak in order to take a more accu¬ 
rate view of the lower parts of the peninsula in this direction, and 
to trace at different points their boundary with the more elevated 
districts. Having crossed the Sungie-bulu river, the road proceeds 
through a low plain, several parts of which are partially inundated: 
to this succeeds a gentle rising on which I observed several large 
detached fragments of Red-Iron-stone of the same consistence and 
colour as the others found near Jehus, above mentioned. After sev¬ 
eral successive risings, which were covered with a deep soil I met 
with a valley the lower part of which transmits one of the branches 
of the river of Kampak. The sides, of which the descent wus con¬ 
siderable, were in several places excavated by streams of water : I 
examined the materials of which the valley is composed : in different 
excavations, which exposed a depth of several feet. I here found 
small fragments of Iron-stone as far as I could penetrate below the 
surface, exactly resembling those at the outlet of the river of Kam¬ 
pak, and at the hill on which the stockade of Jebus is built. They 
all bear the marks of having been carried along (charie) by a cur¬ 
rent ; they are rounded, variously excavated on the surface, and co¬ 
vered with an ochreous crust. Their fracture exhibits them of the 
same constitution as the first Red-Iron-stone which composes the 
