MedlicoH, Garroio Hills. 
15 
likely to lead to any important result.” Unfortunately, in the very next paragraph of their 
report, the Committee pass an encouraging judgment upon much more precarious evidence. 
Passing to E. S. E. we find the same conditions to obtain as in the Singmari ridge. 
The main mass of Harigaon hiE is of gneiss with the thick sandstones resting against 
and upon its southern base either horizontal or with a very slight inclination to the south, 
and again at Tura, the summit of which is about eight miles to E. 30° S. of Harigaon 
hill, the station at the south-west base is just to north of the gneiss boundary; and in the 
stream which drains this flank of the mountain (it is the head waters of the Bunarossi) the 
gneiss appears in the bed for nearly a mile below the general longitudinal boundary, between 
spurs formed of the overlying horizontal sandstone. Down this stream I was taken to see 
a coal bed : it consists of a few sticks of lignite scattered through the sandstone, at six to 
ten feet above the floor of gneiss. 
At Domulgiri, the stage between Harigaon and Tura, I was fortunate enough 
to hit upon the nummulitic limestone; but for the clearing made for the few temporary 
buildings, it would probably have escaped notice. The blocks of rusty stone heaped out of 
the way are evidently derived from a bed in place—the remains of a very thin hand, pro¬ 
bably a single bed, of ochreous earthy concretionary limestone full of nummulites. The 
shaly clays that overlie it are exposed on the side cuttings of the road leading up the hill 
towards Tura; and the cretaceous sandstone occurs in the river immediately below. In 
kind and in position, everything corresponds with what has been described in the section of 
the Sumesurri; but the limestone is reduced to this miserable remnant, useless for any 
practical purpose. This is the completion of the tendency that was already so well marked 
in the limestone band on the Sumesurri, as compared with the same rock in the Silhet 
sections. 
As far as I penetrated to the south of Harigaon I could not discover even the debris 
of the rocks overlying the nummulitics; so I am unable even approximately to assign the 
position of that line of boundary. It must be followed up continuously from the more 
easterly sections. 
The very smaE inclination, but little removed from horizontality, of the strata in this 
region would render the tracing of the boundaries between the formations, as carved out by 
the tortuous vaEeys through these low hills, a very intricate business indeed. 
But there is another geological circumstance that adds much to this difficulty of fixing 
the boundaries, and greatly aggravates the obstruction to observation offered by the dense 
character of the vegetation. This is the occurrence of an older diluvial formation. At the 
point of the spur over Domulgiri, on the spot where Lieutenant Williamson has built 
his hut, this deposit is betrayed by the rolled blocks of crystalline rocks. But it is often a 
sand, which, as partially- indurated, cannot be certainly distinguished in the smaE obscure 
sections, such as almost solely are exposed to view, from the rocks of the underlying forma¬ 
tions. Along the outer margin of the biEs in the Karibari region, this obstruction 
amounts to a prohibition of anything like close work. In exploring the hills from Mobindro- 
gunj and Kakreepara, I could never think, with any certainty-, upon what ground I 
was standing. There can be little doubt that this deep deposit in which the low hEls are 
half smothered corresponds with that of the well-known tract in My-mensing and Dacca 
called the Madhopur jungle. The semi-laterite clay, which is there the chief rock, occurs 
too among these hEls. 
We can now discuss the second statement regarding the coal resources of these hills. 
The Coal Committee remarks, after condemning the only observed outcrops—“ This brown- 
coal formation is not to be confounded with the indications of bituminous coal in the same 
district, afforded by drifted specimens in the bed of the Bunarossi river.” On Mr. 
Bedford’s map, the lvalu above Domulgiri and the Bunarossi above Dumnigaon 
are represented as trending indefinitely to the south, and are labeEed “ coal exists in these 
bills." There are several errors in this information, amounting to a complete misrepresenta¬ 
tion of fact. From Domulgiri the Kalu keeps altogether to the north, passing only 
through-the cretaceous band to the gneiss, and drains the northern flank of Tura. From 
Dumnigaon, the Bunarossi bends steadily round to the north, and drains the west¬ 
ern and southern flanks of Tura. I examined the bed of this river for several miles above 
Dumnigaon : fragments of anything that could he called coal are exceedingly rare in it; 
and are in quality, as well as in quantity, just what might be expected to be derived from the 
sticks of lignite I had noticed in the cretaceous sandstone near the source of the river , and 
