DHARWAR— DIHING. 43 



3. Mallapanahalli crusli conglomerate. 



Eelative ages of 4 and 3 doubtful. 



2. Chitaldrug formation. < ' 



(a) Grey trap, intrusive in the chlorite schists. 



(b) Chalybitic traps. 



(c) Chloritic schists and ferruginous quartz schists. 



The G. R. formation probably consists of local alterations of 

 these rocks. 



1. Javanhalli formation. 



(a) Dark hornblende schists and epidiorites. 



(b) Quartz-magnetite rocks. 



(c) Quartzites or quartz schists. 



In the Shimoga area, the Shimoga schists would seem to corre- 

 spond to the Chitaldrug formation, while in the Kolar belt the 

 Kolar schists are equivalent to the Javanhalli. 



Dhosa OOlite. — Uppermost member of the Chari stage (q.v.) of 

 the Jurassic series in Cutch (W. Waagen, Pal. hid., Ser. IX, 

 Vol. I, Introduction, 1873). 



Diamond sandstone, and limestone.— T. J. Newbold (Joum., Roy. 

 As. Soc, VIII, 156, 1844) used this expression to include " beds 

 of limestone, sandstone, sandstone-conglomerate (the latter often 

 imbedding diamonds), argillaceous, arenaceous, and siliceous 

 schists " which he found " resting immediately on the hypogene 

 and plutonic rocks " in Southern India. From this account of 

 their geographical distribution Newbold evidently had in mind 

 the formations now known as Cuddapah and Kurnool as well as 

 the equivalent Kaladgis, etc. He describes their occurrence in 

 isolated patches as Cuddapah beds, Godavery beds, South Mahratta 

 country beds and Hyderabad beds. Newbold considered (ibid., Vol. 

 XII, 91) that the limestones and associated sandstones might 

 be Carboniferous or Devonian, but he pointed out that the only 

 apparently organic structures found were obscure. 



Dihing series (Dehing).— Name applied by F. R. Mallet (Mem., Geol. 

 Surv., Ind., XII, 298, 1876) to the conglomerates overlying the 

 Tipam sandstones in North-East Assam, and with these regarded 

 as representatives of the Sub-Himalayan Siwalik system and 

 the " Fossil-wood " (Irrawaddy) series of Upper Burma (loc. cit., 

 pp. 300, 301). 



