1892.] Address. 71 



Murray and W. R. Clark, and embraces economic subjects, alphabeti- 

 cally arranged, from L to 0. 



The Geological Survey Department continues to direct its attention 

 to economic mineral exploration ; though geolo- 

 o/lndS? 10 * 11 SurVGy gical investigation is kept in fair progress. The 

 very extensive area occupied by the Dharwars 

 (Transition) in the Anantapur, Bellary, Cuddapah, and Kurnool dis- 

 tricts of the Madras Presidency has, for all practical or economic 

 purposes, been fully surveyed by Mr. Foote, and its position in the 

 formational succession of India has thus been brought into closer 

 correlation with certain transition divisions in Central India and the 

 north-west frontier of Bengal, particularly the Gwaliors and the Bija- 

 wurs. At the same time, the associated crystalline rocks of this region 

 have been differentiated into two series ; the more foliated (or even 

 schistose) sub-division of which can be connected with other bands in 

 the Carnatic and Northern Districts, the whole constituting a distinct 

 newer sub-series in the crystallines of Southern India. The importance 

 of this snrvey of the Madras gneisses becomes manifest when considered 

 in the recent light thrown on their relations by the remarkable paper, 

 " Contributions a V etude des gneiss apyroxene et des roches a wernerite," by 

 M. Al. Lacroix, in the Bulletin de la Societe Francaise de Mmeralogie, 

 for April 1889 ; which gives the result of the first detailed microscopical 

 work on the crystalline rocks of Ceylon and Salem. 



In Baluchistan Mr. Oldham's work has been among the Cretaceous, 

 Tertiary and Recent formations ; the most interesting and important 

 feature of which has been his recognition of a series of passage-beds, 

 constituting his Dunghan Group, which he describes as probably re- 

 presenting the gap between the Secondary and Tertiary periods in 

 Europe. This is an important link in the chain of evidence already 

 gained in Peninsular India and in Sind, regarding the occurrence 

 of series of strata offering similar interpretation. His examination of 

 the recent deposits in the valley plains of Quetta, Pishin and the Dasht- 

 i-Bedaulat, in connexion with the interesting group of natural artesian 

 wells at Quetta itseif, has enabled him to report on the mode of occur- 

 rence and probable distribution of artesian waters in these valley plains. 



On the North-Western Frontier, the posting of Mr. Griesbach 

 with the Miranzai Force, and of Mr. Middlemiss with that of the Black 

 Mountain Expedition, afforded opportunities for some examination of 

 the geology of those regions. Mr. Griesbach's survey has furnished 

 material for a report which includes Notes on the Safed Koh and its 

 skirting ridges ; on the Geological Results of the Miranzai Expedition ; 

 on the Geology of the Khaibar hills ; and on the Petroleum springs of 



