'Transactions of the Bombay Geographical Society, from September 1850 to June 1852. Edited by the Secretary. Volume X.' [‎181] (314/458)

blue clay, with kunkur, and mangrove roots
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181
the Prongs. On tlie Hat l our side of the island it reaches along the
shore as far as the Pilots’ Pier, constituting a considerable portion of the
Observatory compound up to the 1 cvel ot about ten feet above the sea
It forms the grounds of the Lunatic Asylum, and the drill-ground
^twixt the Catholic Chapel and Cabool Church, and so extends where**
ever the level of tire ground does not exceed twelve feet, to the end of
Colaba, near Bombay. A large portion of the lov^er part of the Fort
is built on it: it forms the whole of the Esplanade, extending from the
Apollo Pier to Malabar Hill, and so under the lower portions of the
Native Town. It appears a hard compact rock a little to the eastward
of the Gowalla Tank : near the Garden House of Juggonath Sunker-
sett it exists as loose shell gravel : a little beyond this it vanishes.
Around the base of the bills near Malialuximee, and close up to the end
of the Love Grove velard, it narrows out into a thin border of gravel,
and so continues by the shores of Love Grove and Worlee Hill. The
whole of the level Cocoanut grounds which constitute Mahitn Wood
are formed of it, and it forms the little neck on which the fishing
village stands connecting the castle rock of Sewree with the hill. It is
found all along the low shores of Salsette, Vers ova, and the islands to
the north, and the whole of the low grounds by the shore to the south
ward. A large isolated mass of it presents itself on the line of the rail
way, most opportunely for the ballasting of the work, near the haystacks,
half way betwixt Byculla and the road to Parell. The material here is
loose and incoherent, and it abounds with the fragments of kunkur
from the blue clay and the calcareous tubes from the mangrove roots
about to be described. From this circumstance it seems likely to be
still more recent in its formation than the substances referred to, which
do not appear to have come into existence till after the emergence of
the blue clay with the concrete over it from the sea. This mass of
gravel, which is altogether embedded, is at present below the level of
high-water mark.
BLUE CLAY, WITH KUNKUR, AND MANGROVE ROOTS.
29.— Character. Immediately beneath the formation just described,
unless where this rests directly on the rock, is a bed of bright blue clay>
highly calcareous and charged with salt, nearly identical in appearance
^ith the sludge in our estuaries and along the shore. It varies from a
^ inches to several feet in thickness: its upper margin is at present
■unnrirrrn