Himalayan Journals — Volume 1: Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.Hooker, Joseph Dalton
History
Himalayan Journals — Volume 1: Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
Hooker, Joseph Dalton
Himalaya Mountains -- Description and travel; Natural history -- Himalaya Mountains
The upper 10,000 feet of Kinchin, and the tops of Pundim, Kubra, and
Junnoo, are evidently of granite, and are rounded in outline: the
lower peaks again, as those of Nursing, etc., present rugged
pinnacles of black and red stratified rocks, in many cases resting on
white granite, to which they present a remarkable contrast. The
general appearance was as if Kinchin and the whole mass of mountains
clustered around it, had been up-heaved by white granite, which still
forms the loftiest summits, and has raised the black stratified rocks
in some places to 20,000 feet in numerous peaks and ridges. One range
presented on every summit a cap of black stratified rocks of uniform
inclination and dip, striking north-west, with precipitous faces to
the south-west: this was clear to the naked eye, and more evident
with the telescope, the range in question being only fifteen miles
distant, running between Pundim and Nursing. The fact of the granite
forming the greatest elevation must not be hastily attributed to that
igneous rock having burst through the stratified, and been protruded
beyond the latter: it is much more probable that the upheaval of the
granite took place at a vast depth, and beneath an enormous pressure
of stratified rocks and perhaps of the ocean; since which period the
elevation of the whole mountain chain, and the denudation of the
stratified rocks, has been slowly proceeding.
To what extent denudation has thus lowered the peaks we dare scarcely
form a conjecture; but considering the number and variety of the beds
which in some places overlie the gneiss and granite, we may
reasonably conclude that many thousand feet have been removed.
It is further assumable that the stratified rocks originally took the
forms of great domes, or arches. The prevailing north-west strike
throughout the Himalaya vaguely indicates a general primary
arrangement of the curves into waves, whose crests run north-west and
south-cast; an arrangement which no minor or posterior forces have
wholly disturbed, though they have produced endless dislocations, and
especially a want of uniformity in the amount and direction of the
dip. Whether the loftiest waves were the result of one great
convulsion, or of a long-continued succession of small ones, the
effect would be the same, namely, that the strata over those points
at which the granite penetrated the highest, would be the most
dislocated, and the most exposed to wear during denudation.
Public-domain text, read in full here on John Shaqi.
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