IM'.LUI QUABTZITE SERIES. 103 



raagnesian series, brought to view in what appear to be local anti- 

 clines among the Delhi Quartzites, is really a sedimentary deposit, 

 it must be located at a horizon not more than 1,000 feet below the 

 top of the Delhi Quartzite where it passes up into the Phyllite Series, 

 and probably at a much less depth in the case of the Khercha 

 occurrence. 



This hardly accords with ordinary sections in the Delhi Quartzite, 



and one must therefore be prepared to con- 

 Adventitious vein .«• ,i j • -, 1 1 ,, 

 ()| . i( , in ceive of the magnesian series either as a locallv 



developed sedimentary deposit only, or (what may 

 seem more probable) as being adventitious in some wav, e.r/., 

 vein-filling along a fissure or gaping in the Delhi Quartzite, where 

 the anticline pitches strongly and must have suffered a violent 

 wrench. The observation that the green amphibole actually passes 

 up in the form of small veinlets ramifying among the substance 

 of the quartzite at the northern end of the steatite ellipse makes 

 this supposition additionally probable, whilst we shall see later 

 that other facts from localities yet to be described strongly support 

 this idea. Finally, it is in agreement with observations, made 

 on a similar magnesian series of rocks in Dungarpur district (adjoin- 

 ing the Idar area on east and north) by my colleague the late Mr. N. D. 

 Dam, which tend to show that the magnesian minerals occupy 

 narrow bands cutting indiscriminately into Delhi Quartzite and 

 Phyllite Series. Their constant association in Idar, however, with 

 the former, in apparently bedded or banded masses and layers, has 

 made it convenient to describe them here along with their 

 (albeit perhaps abnormal) host, the Delhi Quartzite. 



The second occurrence of similar magnesian rocks at Ghanta 



, ax „, is of very small area. Ghanta is a deserted 



(2) Ghanta outcrop. ... J . , 



village, really lying m badra State, about 1£ 

 miles east of Kundel and 3 miles E.byS. of Titoi (Tintoi). It lies 

 in an alluvial inbaying among the same ridge of Delhi Quartzite 

 as that which carries the outcrops of steatite, etc., last described 

 but on its western flank, and it is separated from the latter by some 

 miles of quartzite hill barren of any such deposits, so far as is visible. 

 It is exposed in the dry stream-bed just 1£ miles N.W. of the 

 village site, and consists of steatite in some 3 or 4 beds of 10 feet 

 thickness, g 2 ^ interbedded with more greenish chloritic rock {$£ 3 — 3 2 9 4 ) 

 through a distance of some 20 or 30 yards. Specimens taken from 

 here indicate a very fair quality of steatite. There is no visible 



