Himalayan Journals — Complete: Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.Hooker, Joseph Dalton
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Himalayan Journals — Complete: 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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