cxcvi Journal of the Asiatic Society of Bengal. [N.S., XIII, 



been deposited upon it with an unequivocal unconformity marked by a 

 conspicuous conglomerate at or near the base, — in fact to be younger than 

 that gneiss, to have been folded un on ton of it. fan 1 fori in n1a.p.Aa rianuri. 



gneiss 



vijchv gLivioa, uu nave utron iuiucu up uix vkj^j ui it, iiAUltCU. 111 JJIfctUUS, UeilUU- 



ed in places, and so left in their strip-like basins, as presented to our view 



to-riRv v 



to-day 



But things have gone apace with the energetic and versatile members 

 of the Mysore Geological Department, and now the main order of rock 

 succession has long ago been implicitly, and more recently formally, re- 

 versed ; the Dharwars becoming the oldest rocks in Mysore, whilst for 

 nearly every one of the rock members of that system, including even the 

 limestones, conglomerates, quartz iron-ore schists and lastly the quartz- 

 ites, an igneous origin of some sort is now seriously championed. If one 

 reads through the Records of the department for the last ten years or so 

 one constantly comes across remarks by Messrs. Wetherell, Slater. 

 Jayaram and others to the above effect. For instance : '« The quartzites 

 are probably all of igneous origin and belong to different relative periods 

 of formation, just like the various other acid members of the series" or 

 " From the general evidence obtained it is satisfactorily clear that the 

 true character of these conglomerates is autoclastic and not sedimentary. 

 i I T S ti * eaimentar y- lo oking grit, arkoses, and fragments! rocks appear 

 to be highly altered lavas and tufaceous deposits and not metamorphosed 

 true sediments. 



I might go on quoting in the same strain for sometime, but I will 

 con ent myself with one more example from Dr. Smeeth's "Outline" 

 where, speaking of the quartzites, he says : '« Others, entirely quartzose, 



whi.TT ? w *? 6Xhibit intrU8ive Contacts with adjoining rocks, 

 whilst others of a later date penetrate the subsequent granitic gneiss and 



t W JT 8 ,T tbG gn61SS int0 the schists - Ther ° can be little doubt 

 «nH ^oJ u e 9 uartz ' tes ar « crushed and recrystallised quartz veins 



ouesSon wffT hyne \ and P° ssibI y fortes, and it is at least open to 

 WhSrjlr ♦ Z WG haVe f ny Which are g enuine sedimentary rocks." 

 Ins hi! r T y u thiDk as to the Pliability of these condu- 

 ced advoeatSf 1 . rf° r^e* to the una nimity with which they have 

 to be "?h«r f : J n ^t d ° r L Sme6th in one of his annual reports appears 

 o? the * coZZf f he " hom r et s nest " that he has raised in the form 

 I o nerate t «, I transference of previously imagined sedimentary con- 

 find a , 1 e S£S^ ""S ° merates " a "d he dghs for " some one to 

 watr worn P p ebb£' a ? t0ry Sed ' mentar y conglomerate with nicely rolled 



unde^one* hTtt* 1 ^ °l thou § ht > <!«*•% and apparently unanimously 

 gaSr the o? 1 a T^ 8 ° f the Mysore Geological Department, re- 

 and phvsical trTn f ^f^ T ° f these roc ^ and the series of mineral 

 verv SncertlT oT t,0r \ S . thro,l ? h which they have gone, must be 

 tremelv pe" P lexinl J! ult^ ^^cal student. It must be ex- 



entirety Xlt" LTht Zf 115 *?T g very ""acceptable at least in its 

 considerable ^ imTmanninT^ 6 ^ tha t in the early nineties I spent a 

 association UrMrF P H g «« ^ aPe88 ° f Salem and Coimbatore, and in 

 appear tailing off into in™ 5 &&W somethi ng of the Dharwars as they 



part of these ditrcts lo ?f drawn -° u t strips and patches in the northern 

 sional wider patches^ pZ. 0pi ? n then formed of those strips and ocea- 



and I may perhan^ r."nL P !• m an MS " re P ort written at that time, 



* ^y perhaps quote a portion of this. I then wrote :- 



system, .^evident That r £ ti0nS ° f , the Dh a™ars with the gneissic 

 their distinctness o^f text"- * g6I i eral a PP ea ranee of the Dharwars, 

 they lie in continuous 2 "? 8tr " c , t 1 ure and composition, and the way 

 tions in evS" Z^rti: nf ° ,d f d amon 8 the pisses, are indie* 



formation and that ifcomTln V' th ? f ° rmer bein « the y ° ,mger 



comes in normal sequence above the gneiss: 



