PART 3.] 
Medlicott, Shapur Coal-field. 
85 
The structure of some of these runs of vein quartz is peculiar: the small veins of which 
the reef is made up are not always coincident with the general direc- 
Peculiar local structure. T ,, y ,, , n 
tion. In the hill north-west ol bhoura the component veins are 
nearly normal to the direction of the aggregate. In the Tawa above Temni the run of the 
quartz rib is east-west, while the veins composing it lie north-east, south-west. It is per¬ 
haps conceivable that ‘colliding’ earthquake waves might shatter the rock in this manner. 
The induration and metamorphism of the sandstone that occurs in connection with this 
infusion of quartz is sometimes remarkable, as it takes the form of 
Peculiar induration. felspathisatiou, the development of innate crystalline felspar. I 
noticed this at the contact of the Lodadeo reef iu the Tawa. It is important to find it in 
this connection, because the most marked case I found of this form of induration is not 
visibly connected with any veining. It is in the small hills on the Bhoura stream south¬ 
west of Baudabir. They are formed of sandstone having quite a granite-like hardness ; 
the porosity of the sandstone is not destroyed, nor is the earthy matrix quite obliterated ; 
but bright glassy facets of a felspar are disseminated, manifestly innate; and it must hold 
the whole in an invisible bond to account for the peculiar hardness of the rock. 
The well-marked faults within the stratified series form another peculiar feature of this 
.. region. We are familiar enough with the word ‘fault’ in the 
Faults: dimensions. D . 
northern region, about Mohpani; but they would he correctly 
termed slips in comparison witli the principal faults in the Shapur field, where top Barakavs 
or even high Motur strata are brought into contact with middle or lower Talchirs; in which 
cases the throw must be from 500 to 1,000 feet. 
Notwithstanding the dimensious of these faults, I cauuot look upon them as anything 
, , but local features, not merely in the literal and obvious sense, hut 
Local relations. ■’ _ 
as connected with and determined by pre-existing local conditions. 
The Machna, north-east-south-west, fault runs with the crystalline range of Bhaorgarh ; but 
I cannot regard them as concomitant effects of elevating action. I rather connect the fault 
with a pre-existing feature of the basin of deposition, of which there seems to be coincident 
evidence in the marked change in the character of the Talchir strata along that line. 
The only noteworthy instance in India of Barakar deposits occurring at a high elevation is 
on the continuation of these outcrops to the east, in the Pencil valley. 
Different throw in east and m, , n , 
wes t. The case has been appealed to as a sulheient refutation or the ge¬ 
neral remark that the areas of Barakar deposition correspond in a 
recognisable manner with the existing depressions of the peninsula. The objection, however, 
will not hold if it is shown that the apparent exception is due to local elevation; and there 
seems every probability that such was the case. But for the great faults which set on to the 
eastward from Shapur, the coal-measures here would correspond in position with those in the 
Pencil. The fault which brings up the coal on the Pencil river west of Chendia has, on the 
contrary, its upthrow to the north: here, too, the quartz veins keep clear of the faults. 
The structural features of this region offer a most tempting subject for study. I believe 
it will appear that the limitation of the sedimentary basin here is not in any important degree 
due to elevation from the south; hut rather that this present local stratigraphy is connected 
immediately with pre-existing surface features. 
Summary. 
Although the foregoing details are reduced to the minimum required for any one 
who would carry on the investigations described, or even as evidence for any one who 
would study the questions discussed, each of which is marginally noted, it may be well 
biit'H} to point out what conclusions or opinions have been arrived at. 
