'Transactions of the Bombay Geographical Society, from September 1850 to June 1852. Edited by the Secretary. Volume X.' [‎177] (310/458)

*
AtLimiTAL
■ a nd the ses r
have alloi
^•k Bay, a 1;
from Love-h
lill, it is not fi;
present tliefe
m this on to Si:
period An I
seems to have I
ssion to thiseili
[s constitutingt
ver at higW
lual submerged
!sque thanatp 1
adeformed tj' 1 '
ITT
involves me in some repetition: the apparent clumsiness arising from
this will probably be more easily excused than the obscurity which
might have followed the want of it. In the following detailed des
cription, I shall take the surface formations first, and so proceed down-
wards.
DETAILED DESCRIPTIDN.—LAGOON FORMATION.
20. —All-uvium. 1, Lagoon Formation j Littoral Concrete, or
raised Sea Beaches ; 3. Blue Clay, or submerged and reclaimed silt;
4, Lower Alluvium, or Old Marine Clay ; 5. Red Earth,
21. —The uppermost and most recent is that to be met with all over
the Flats in the centre, and salt pans on the Eastern side, of the is
land, denoted by the bright blue on the map. It is of somewhat un
certain depth it is nothing more than the sea sludge commi
nuted trap, deposited before the waters of the ocean were
shut out artificially from the region where it prevails, and $o
back to the period when the island began to emerge from its previous
depression to its present level. We have thus two blue clay formations,
running both in point of time and composition into each other, and
betwixt which, unless where beds of different character intervene, no
distinct line of demarcation can be drawn. The very appropriate namo
of Lagoon Formation was conferred on the uppermost of these
by the late distinguished and lamented Captain Newbold, Our Flats
still occasionaly appear as a lagoon, when the sluices are left open at
spring tides, and on these occasions of course a slight addition, identical
with the deposit, is made. The lagoon formation, though in certain
circumstances gliding insensibly into the old blue clay of a former
age, is in general, chronologically speaking, separated from it by a very
distinct and well-defined variety of rock, on which I have conferred
the name of littoral concrete. Before things can be made intelligible,
J must be permitted a few preliminary remarks in reference to the two
formations just referred to*
EVIDENCES of an UPHEAVAL AND DEPRESSION ALL ALONG THE SHORES*
OF INDIA,—PROBABLY OF THE WORLD.
^—“The alluvium around Bombay commonly prevails in some suck
& tate as the following t