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358 PROCEEDINGS OF THE GEOLOGICAL SOCIETY.
trappean hill we may come upon the freshwater deposit at three di-
stinct elevations. There is first the stratum which underhes the nodular
trap generally throughout the plain, and which may be seen some-
times laid bare at the commencement of the ascent ; — then, after
passing over hard and soft amygdaloid, we come to another bed,
overlaid by nodular trap ; on gaining the top of this we reach a
terrace, which conducts us to another ascent, where we find ere
mounting to the summit a repetition of amygdaloid, sedimentary
rock, and globular basalt. An example of this occurs at the
hill of Gidsid, 40 miles S. from Nagpur, the top of which has been
Fig. 3. — Section of Gidad Hill.
East. West.
a. Freshwater deposit, as seen in the plain, of a white colour.
b. Freshwater deposit, of red colour, under the terrace.
c. Freshwater deposit higher up, brownish green in colour.
appropriated by the disciples of a Musalman saint, named Shek
Farid, to a mendicant establishment, which is supported by the
donations of Hindus and Muhammadans alike, from, all parts of the
Nagpur territory. See the accompanying section of the hill from east
to west (fig. 3), where a is the deposit in the plain, white ; b the same
stratum of a red colour under the terrace ; and c a repetition of it
higher up, brownish green. Whether there was a fourth stratum
above c, the quantity of brushwood and want of time prevented me
from observing. That all these strata are one and the same, though
they differ in hue, I have no doubt. When we become acquainted
with the changeableness of this deposit within a space of a few yards,
its different phases on the eastern declivity of Gidad Hill occasion no
difficulty. Near Katol, 40 miles N.W. from Nagpur, a similar
appearance is presented. There a thick stratum of red clay lies at
the foot of the hill, and we see its tendency to slope upwards and
lean against the ascent ; but we leave it behind, and come upon the
amygdaloid, which emerges from under it. The amygdaloid is over-
laid by a bed of red clay, which is surmounted by nodular trap con-
stituting a terrace. Above this, before we reach the summit, we
. meet with a succession of amygdaloid, red clay, and nodular trap
again. In ascending the ghat to GawilgaJ Fort, which however is
beyond the limits of our map, the same thing may be observed.
The slope is so steep, that the road is carried in a winding direction