1830 .] 
On the Structure of the Sitahaldi Hills. 
< 27 
MOOSULMANS. 
Ruees, or persons of independent income, Shekh, Sueed, 
Moghul and Patan, 
Joolaha, or Weavers, 
Tuwaeefs, 
41 different professions and trades, 
Fuqeers, of 80 Tukeeas, 
Chundal, or lowest cast, 
Total Moosulman Population, 
Remainder, supposed to be composed of travellers, visitors, 
&c. and children omitted in the Choudree’s computations, 
with the unavoidable omissions of the catalogue itself, 
Population of the City of Bunarus as by house census, 
1 10,000 
15,000 
1,800 
4,500 
500 
800 
32,600 
13,400 
i i 
1,80,000 
VIII.— On the Geological and Mineralogical Structure of the 
Sitahaldi, Nagpur, cmd its immediate Vicinity : by the late H. W. 
Voysey, Esq., H. M. Qlth Foot. 
[From the 17th volume of Asiatic Researches.] 
The hill of Sitahaldi, although agreeing in form and interior structure with other 
basaltic hills in its neighbourhood, merits a more particular description on account 
of some peculiarities in the composition of the main rock, hitherto unno iccc y 
geologists, and for the opportunities afforded by its extensive quaiiies o suu 
the varied structure of the rocks of the trap family, which is iaxel> to e seen i 
so distinct a manner. ... 
The mass of the hill is composed of porous basalt, with a semi-columnai appear- 
ance, derived from numerous vertical fissures. It passes in some places, iot i m a 
gradual and abrupt manner, into a coarse porous wacken or indurated clay, w lie i 
in its turn changes in a similar manner to the nodular basalt or wacken, of w nc 
the northern and southern summits of the hill are composed. At the junction or 
these rocks, the passage is sometimes so gradual as to giveF the intermediate rock 
an indeterminate character partaking of the nature of both. At others it is a ^ ru P >. 
yet, notwithstanding the abruptness of the change, the vertical and hoiizon a in- 
sures are prolonged into each, and cross the line of junction. I shall not leie en ei 
into a greater detail of these appearances, but shall content myself wi i o >se iving, 
that the most satisfactory explanation of these phenomena is derived from mat 
theory which ascribes to the trap rocks an igneous origin, under pressuu o a gi < 
The semi-columnar basalt forming the greater part of the hill is veiy porous,, 
containing numerous ainygdaloidal cavities, which are, tor the mos pm , J 
lined with a peculiar mineral, which I presume to name conchoidal au«ite, so e- 
times, however, they are nearly filled with it, or with calcedom , - 1 > 
carbonate of lime-, the calcedony being usually covered with a coatmg of g 
earth. The rock itself is composed of hornblende and felspar, with the au gite, so 
profusely disseminated, as to claim a right to be considered, in sonic - ca ''i ^ ‘ 
constituent of the rock. This is, I believe, the first time that c p n ^mdal au.ite 
has been found entering into the composition of basalt. The ro Vertical and 
of considerable specific gravity, notwithstanding its porosi } . ., a j so 
horizontal fissures are not always straight, but are 
sometimes, lined with an infiltration of calcedony coa e wi 1 ' y function with 
This rock is succeeded by an indurated clay or wacken, w n •[ , fissures 
the basalt, frequently partakes of its semi-columnar stiuc , . 'extending 
being prolonged into the wacken, and the schistose struc uie j., ‘ . rounds 
into the hasalt : these changes may be favonrably seen in the fosse which suirounds 
the fortification. „ t lip hill 
The indurated clay or wachen seems to form 
as it is not seen m the hollow between the greatei < - contains crystallized 
columnar basalt being there uncovered by any lock. is the most 
carbonate of lime and semi-opal; but calcedony, coate wi giee < j 
common mineral found in it. „ , . , ; n «;nection an- 
This rock passes into the nodular wacken, wine i, on a matr ’i x G f 
pears to be a collection of stones rounded by attrition, < 
