80 MIDDLEMISS: THE 8EOLOG2 OF tDAB STATE. 



Six miles to the nortli-cast of Jamla, at Sabli and Iluvaeh, 

 there is evidence of a distinct dip of 10° S. 



Sabli and Ruvacli. . ., 



in the quartzite. 

 The above briefly described area of Delhi Quartzite taken as a 

 whole, certainly presents much regularity of 

 strike (N.N.E. — S.S.W.) and an apparently 

 dominating dip of about 30° to 40°, and even steeper angles, in a 

 generally E.S.E. direction. The quartzite is nowhere discovered 

 to lie upon Aravalli or any other rocks, the latter when they do 

 appear, as near Mundeti, indicating a discordance that yet awaits 

 explanation. Whether the sequence is entirely a normal ascending 

 one in an east-south-east direction, as seems clearly indicated at 

 the north end of the area, where these rocks are followed by the 

 younger phyllites in the higher reaches of the Hath mat i river, and 

 as more vaguely indicated by sericite-schists and very prominent 

 quartz-veins near Temlmna Math lower down in the same fiver 

 valley ; or whether it conceals repetition by isoclinal folding, or 

 whether it is cut through by strike-faults causing an equivalent 

 repetition, is the merest guess at present. 



Let us now examine the south-eastern aspect of this 

 iiathmati river quartzite area as it appears along the general 

 soclions - direction of the Hathmati river. 



Beginning at the northern edge of the State in the Iiathmati 

 river, at a point '1 miles west of Chithoda. 

 hodatoBhitoda. tne Delm Quartzite is well exposed on the 



right bank of one of the affluents. Here 

 its passage by gradual interbedding up into the Phyllite Series is 

 observed. Bedding in both series is absolutely vertical, in all 

 clear sections reasonably free from surface bias. Cross, or false, 

 bedding is noticeable in some quartzites, but ripple-marks, which are 

 a feature of some of the Alwar exposures. I have never been able 

 to detect in any rocks in Idar. 



Below this point southwards the Delhi Quartzite ridge, down 

 to near Bhiloda, continues with much the same strike and dip 

 though with some curving of the former, as near Bhiloda itself ; 

 but there are no more visible occurrences of the Phyllite Series, 

 except as narrow straight ridges following parallel to, and at a short 

 distance from, the quartzite. 



The Mau hills have already been referred to as showing a steady 

 south-easterly dip. From Mau there is some sharp recurving of 



