82 HOLLAND AND TIPPER- : INDIAN GEOLOGICAL TERMINOLOGY. 



an equivalence with the Carboniferous of Kashmir (Rec, Geol. 

 Surv., Ind., XXI, 151, 1888), a correlation adopted also by C. L. 

 Griesbach (Rec, Geol. Sun., Ind., XXII, 161, 163, 1889 ; and Mem., 

 Geol. Surv., Ind., XXIII, 12, 1891). The lower and middle beds 

 of the Muth series were shown by H. H. Hayden to be Upper 

 Silurian, whilst the uppermost bed — the white. Muth quartzite — 

 is of doubtful age, though not younger than Devonian (Mem., 

 Geol. Sun., Ind., XXXVI, 24, 29, 1904). Later (Geog. and 

 Geol. of the Him., Part IV, 233, 1908) Hayden used the terra 

 Muth system to include — 



(d) White Muth quartzite possibly ranging up to Devonian, 

 (c) Coral limestones with Silurian (Gothlandian) fossils. 

 (b) Ked quartzite without determinable fossils. 

 (a) Dark coral limestone with doubtfully Ordovician fossils. 

 A quartzite similar in character to the white Muth rock has been 

 found by C. S. Middlemiss (Rec, Geol. Sun., Ind., XL., 216, 1910) 

 in Kashmir in contact with Upper Silurian beds below and Lower 

 Carboniferous beds above. It is thus equivalent to the white 

 quartzite of Spiti described by Hayden. 

 Mysore gneiss.— See Bellary gneiss. 



Mysorin.— Name applied by Dr. Thomson (Phil. Trans., 1814, 45 ; 

 Heyne, Tracts on India, 441) to an amorphous copper ore 

 from Ganmanipenta, Nellore district, Madras Presidency, and 

 considered to be an anhydrous carbonate of copper with impurities. 

 F. E. Mallet (Rec, Geol. Sun., Ind., XII, 166, 1879 ; Man. Geol. 

 Ind., Pt. IV, Mineralogy, 157) proved it to be an impure malachite. 



Nagamalai Stage.— Named by R. B. Foote (Mem. Geol. Surv. Ind. 

 XX, 11, 13, 1883) after the Nagamalai ridge, Madura 

 district, forming the western side of the Vaigai valley for many 

 miles. The third division into which the crystalline rocks of the 

 district are divided (see Allagiri stage). 



Nagari quartziteS.— The lower part of the Cheyair series of the Cud- 

 dapah system. Named from the prominent hill known as the 

 Nagari (Naggery) nose (13° 23' ; 79° 39') in the North Arcot 

 district, by W. King (Mem., Geol. Surv., Ind., VIII, 168, 1872). 



Nahan (Nahun) Stage.— Named by H. B. Medlicott (Mem., Geol. Surv., 

 Ind., Ill, Part 2, 13, 1864) from the town and state of Nahan (30° 

 32'; 77° 21') for the rocks now distinguished as the lowest stage 

 pf the Siwalik series. Medlicott divided the Sub-Himalayan 



