Additional seams, one of them 21 feet thick, have since been proved by boring.
field may possibly become of some economic importance, as there is a
prospect of there being a railway constructed at no great distance from
SIKKIM. XXXI. Darjiling District.*
field occupies a narrrow zone, which stretches along the foot of the
Himalayas from Pankabari to Dalingkote. The rocks are probably
Barakars, which have been much crushed and tilted, dipping at angles of
from 40° to 900 to N.N.E., or towards the main mass of the
hills. Frequently the sandstones have been converted into quartzites,
and the shales into splintery slates. Much of the coal is in the
condition of powder, and some of it has assumed the character of
graphite. The effect of the compression has been to reduce it by
removal of the volatile portions to the condition of an anthracite.
Some experiments were made with a
* Mallet, " Memoirs Geological Survey of India," vol. xi. " Manual,'' vol. i.