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6
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DIAMONDS.
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Geology.
Although
in the following pages I shall, for each locality, give a sketch of the
mode of occurrence of the diamonds, it will be well, perhaps, by way of
introduction, to give a general account of the formations which
include the diamond-bearing beds, and likewise attempt to correlate
those of the several localities respectively.
Up
to the year 1855 Indian geology was in a condition of extreme
confusion, for although much excellent work had been done, chiefly by
amateurs, still it was, from the nature of the case, of a scattered and
disjointed character, and the attempts at correlation of deposits
situated at wide intervals had led to very erroneous conclusions, none
of which were further from the truth, as now known, than those having
reference to the diamond-bearing deposits.
In
the year 1857 a collection of geological papers on Western India,
&c, with a summary of the geology of India generally, were printed
by the Government, under the editorship of Dr. Henry J. Carter.
Valuable as this publication was, its day is now gone by, and it is,
therefore, to be regretted that it should still continue to be quoted,
not only by discursive writers on India, but even in standard works on
general geology.
The
publications of the Geological Survey of India, as now constituted,
which commenced to appear more than twenty years ago, have from time to
time for different areas successively replaced the confusion and
incorrect correlation by an orderly arrangement based upon solid
evidence. Erroneous conjectures
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