PART 1.] 
Mallet: Geological Notes. 
37 
Micaceous quartzite is again seen in the hills west of Manjne, being, I believe, the same 
as that to the east; but the junction with the gneiss is here somewhat different. From 
Deothan to Paeharidi the dip is mostly under 30°, the rocks in the southern part of 
the section being schistose homblendic gueiss (dome gneiss in the hill north of Deothan) 
with hornblende schist and rock; these become more schistose to the north-east and pass into 
mica-schist, above which again is schistose quartzite. 
Quartzite is again found to overlie the gneiss in the western part of sheet 8, whilst in 
the centre of the same the mica-schists are in immediate contact. It may, perhaps, be 
suggested that the quartzite should be included with the gneiss, and the houudary between 
the two series drawn above the former, the absence of quartzite in places being thus due to 
unconformity. It will bo found, however, when describing the submetamorpkics, that while 
there is generally, at least, a well-marked junction between the gneiss and quartzite, none 
such is obtainable between the latter and the schists; it is, however, to be observed, that the 
junction of the schists with the gneiss is also everywhere one of passage, sometimes gradual, 
sometimes tolerably sharp, but still a passage; and the foliation of each rock is always, as 
far as my observations extend, parallel to the common boundary : at least, if there bo any 
deviation it is so slight as to escape detection. 
Some local cases have been mentioned above, in which the gneiss overlies the submeta¬ 
morpkics at high angles. Such are, undoubtedly, invortions of the strata, the metamorphics 
being clearly the lower series. Amongst other examples in which the true superposition of 
the submetamorphics is apparent, I may mention the Deothan section, the band of 
quartzite north of Giwan, and the schists flanking the gneiss hills north of Bhu 1 adi. 
Although no unconformity is discernible between the two series in the present area, this 
does not necessarily militate against the unconformity which has been supposed to exist else¬ 
where. In the Vindhyans of Central and North-Western India, we have an example of a 
great formation, which, notwithstanding its ago, is undisturbed over large tracts of country; 
whilst in other areas, like the Dhar Forest, the strata are highly contorted. If on such a 
formation another great series were deposited, the two would clearly bo uneonformable to 
each other, although such unconformity would not be discernible in many places ; and if 
at some subsequent epoch both were greatly disturbed, the resulting relations of the two 
series to each other would perhaps bear some resemblance to those of the metamorphics and 
submetamorphics. 
Stratigraphy. —If a section be taken from north to south across the Bh i a ur a range, a 
little to the west of tko trigonometrical station, the following succession of strata is passed 
over in ascending order—the dip throughout being to the south at high angles, but decreas¬ 
ing somewhat from north to south, the gneiss b being nearly or quite vertical, while the 
mica-schists h are inclined at 60° or 70°— 
a. —Gangetio alluvium of Bihar. 
b. —Gneiss forming dome-shaped hills. 
c. —Small band of mica-, with probably some hornblende- schist, fragments of the latter 
being strewn about. 
d. —Quartzite forming the ridge on which the trigonometrical station is situated ; some 
portions are a hard, finely granular rock, breaking with a sub-vitreous fracture, 
and occurring in beds from one to two or three feet thick, in which no schistose 
structure is developed; others are coarse-grained and micaceous, and micaceous 
flaggy beds are also met with. 
e. —Hornblende rock and schist, with mica-schist and interbanded layers of quartzite. In 
some of the hornblende schist the foliated structure is well developed ; elsewhere 
