88 MIDDLE MISS : THE GEOLOGY OF IDAR STATE. 



In this Hathmati river area just described, a point of great 

 significance is the actual junction of the Delhi 

 PhyUiter W ' th Quartzite with the Phyllite Series along a 1| 



mile stretch at the boundary of the State ; 

 and that this line of junction continues beneath the alluvium to 

 a few miles north of Bhiloda is quite probable from the presence 

 of the phyllites in the form of an extended narrow ridge running 

 parallel to, and within less than a mile of, the quartzite. Inasmuch 

 as a duplicate of this arrangement in opposite order is present on 

 the other side of the Hathmati valley one may be reasonably 

 certain that a long syncline in the phyllites follows down the 

 valley ; and so we should be prepared to find the phyllites continu- 

 ing to the east and south-east of the three hills near Thuravas 

 and Bamna and that the uppermost beds of the Delhi Quartzite 

 also follow round somewhere here. So far as the scanty evidence 

 at Thuravas and Tembana Math goes, the sericite-schists and white 

 quartz-veins there seen may reasonably represent the Phyllite Series. 

 The same three hills, however, on their other, south-western, 

 flanks, present a ragged broken aspect, surrounded by alluvium, 

 and with no trace of the Aravallis ; so that it is impossible to 

 guess at the detailed relationship between the quartzite and the 

 Aravallis, except that there is great irregularity and discordance of 

 some sort. 



The next of the fairly expanded areas of Delhi Quartzite lies 



south and south-east of the Bamna-Punasan 

 Hill-mass south of vm Ti. • i t±. 1 n i i # 



Dhuleta and Sathrol. hlil - xt 1S a lo % and well-marked feature, with a 



somewhat fiat or gently undulating upper surface 

 at a level of about 1,000 feet. This expanded area coalesces on the 

 east into a single, prominent ridge following parallel to the river 

 and bounding the Hathmati valley on this side. Leaving the latter 

 for the moment, the expanded portion, like the hills just described 

 presents numerous fine examples of dip-slopes of 40° to 50° to 

 N.N.W. and N.N.E., etc., along the plateau edge from Hunj 

 (and the little ridge 1 mile N.W. of Hunj) via Dhuleta, Vantadi, 

 Sathrol and the edge of the " bay " via Bebar Nani to Janali. 

 These dip-slopes (see sketches, text figs. 15 and 16), from the occasional 

 presence of thinner bedded phyllites and one considerable bed of 

 mica-schist among the quartzites, and also from lithological varia- 

 tions in the quartzite particularly well seen in the low ridge to 

 the north-west of Hunj, which accentuate and prove the actuality 



