part 2.] Racket; Armli Series in North-Eastern Rajpulana. 
89 
eastern side, of Hie black quartzites and slates in which crystals of andalnsite are abundant. 
The rocks on the western side are higher in the section. At Loharwarri there is a black 
limestone, probably the same as that in the Motidongri ridge, and over it a considerable 
thickness of a rough blue quartzite, largely quarried for grindstones. Between the centre 
hill and the ridge arc some hillocks formed of the Kuslialgarh limestone and breccia. 
The four ridges east of Malakheri, something in the shape of an inverted W, form 
a double anticlinal in which the Ajabgarh rocks are well represented. In the centre of the 
western anticlinal there is a large hill of the Alwar quartzites dipping under the Kuslialgarh 
limestone and breccia on three sides, viz., north, east, and west, above which come the black 
slates with a band of talcose limestone near the base and covered by the Berla quartzite, 
of which the greater portion of the four ridges is formed. This quartzite requires notice, 
as it makes a splendid building stone and is largely quarried for that purpose; it is pearly- 
grey in color and contains numerous specks of a black mineral, probably hornblende. 
In the eastern anticlinal a similar section is exposed, with the exception of the Alwar 
quartzites in the centre. The western limb of the double anticlinal extends in a northerly 
direction as far as Nogauwa, where the Alwar quartzites of the Tigara ridge dip under it; 
and in a south-westerly direction, to some miles beyond the Deoti lake in a synclinal 
trough of the Alwar quartzites. 
The rocks of this group occur only in the Alwar territory, principally in the north¬ 
west corner of the State, on the left bank of the Sahi river at Mdndau 
the Mandan group. JJ arot l and Tasing, and at Mandaor, thirty miles to the south-east of 
Alwar. The group consists of schists and slates, abounding in crystals of andalusite, stauro- 
tide, garnets and actinolite, and some thin bands of quartzite interbedded with them. 
There is some doubt as to the position of these rocks in the series, or even if they belong 
to the series at all. This doubt arises from their occurring in isolated ridges disconnected 
from any known rock of the series. Near Barod, however, there is a long hill formed of 
the Kuslialgarh limestone and breccia, between two ridges of the schists, and separated from 
them by about half a mile of alluvium. 
Again, at Mandaor, the double ridge of Mandan schists occurs between two ridges of 
Alwar quartzites, converging towards the south and both dipping towards the schists, 
apparently forming a synclinal in which the schists lie. Mineralogically there is little 
difference between the Mandan rocks and those of the known Arvali series; the Ajabgarh 
slates containing andalusite, &c., in the hill east of Alwar, as well as the quartzites, are very 
similar to those of the Mandan group; so that it seems probable that the Mandan rocks 
really belong to the series, and if so they form the highest group here represented. 
The lower part of the Alwar quartzites contains numerous bands of contemporaneous 
trap, some of them of considerable thickness and forming hills several 
Trap ‘ hundred feet high. In some sections they are very numerous, while 
in others they are altogether absent. In the Byana hills there are at least six bands separated 
by bands of quartzite. At the southern part of the Alwar hills, for some miles round Tehla 
and north of Raialo, they are also very numerous. In the Tehla section there are at least 
ten separate bands. Again, in the Rimtumbour hills the quai'tzites include several bands of 
trap, one of which is upwards of 150 feet thick. In the northern part of the Alwar hills 
a comparatively thin band of trap is occasionally met with, but generally it is altogether 
absent. In the large accumulations of quartzites in the hills west of llajgarh, and also 
in the Lalsot hills, there is no trap in the section. 
