They fell (from whatever cause), and lay until their
silicification was complete. A slight depression of the surface, or
some local or accidental check of some drainage-course, or any other
similar and trivial cause, may have laid them under water. The
process of silicification proceeded gradually but steadily, and after
they had there, in lapse of ages, become lapidified, the next
outburst of volcanic matter overwhelmed them, broke them, partially
enveloped, and bruised them, until long subsequent denudation once
more brought them to light' (J. G. Medlicott, in _Memoirs of the
Geological Survey of India_, vol. ii. Part II, pp. 200, 203, 204,
205, 216, as quoted in _C. P. Gazetteer_ (1870), p. 435). The
intertrappean fossils are all those of organisms which would occur in
shallow fresh-water lakes or marshy ground.
Besides the author's friend and relative, Dr. H. H. Spry, Dr.
Spilsbury contributed papers on the Nerbudda fossils to vols. iii,
vi, viii, ix, x, and xiii of the _J.A.S.B._ Other writers also have
treated of the subject, but it appears to be by no means fully worked
out. James Prinsep, to whom no topic came amiss, discussed the
Jubbulpore fossil bones in the volume in which Dr.
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