34 HOLLAND AND TIPPER : INDIAN GEOLOGICAL TERMINOLOGY. 



Char nock He series. — Name proposed by T. H. Holland (Mem., 

 Geol. Sun., hid., XXVIII, 120, 242, 1900) for the rocks resem- 

 bling the pyroxene-granulites and pyroxene-gneisses of Europe and 

 America. They include pyroxene-bearing forms varying in com- 

 position from hypersthene-granite (charnockite) to pyroxenite, 

 itnd are regarded as part of the Archaean complex of India. 

 Previously named " Nilgiri or mountain gneiss " by W. King 

 {Mem., Geol. Surv., bid., XVI, 125, f.n., ^1880). 



Chaungmagyi series.— Name proposed by T. H. D. La Touche (Rec, 

 Geol. Surv., hid., XXXVII, 53, 1909 ; Mem., Geol. Surv., hid., 

 XXXIX, 47, 1913) from a river of that name in the Northern Shan 

 States, for a series of unfossiliferous red, purple and grey 

 quartzites, slaty shales and felspathic grits, generally showing 

 signs of alteration. Its age is considered to be doubtfully 

 Cambrian, as the rocks had suffered deformation and denudation 

 before the deposition upon them of true Ordovician strata. They 

 are compared to the Shillong series on the one hand and to the 

 Hu-t'o system of Northern Shan-si in China and also to the 

 " Untersinische Schichten " in Shantung on the other hand. 



Cberra sandstone. — The sandstones underlying the Niunmulitic 

 limestone near Cherrapoonjee (25° 17' ; 91° 47') in the Khasi hills 

 of Assam were regarded by T. Oldham (Quart. Journ. Geol. Soc, 

 XIX, 526, 1863) as Upper Cretaceous in age. The fossils col- 

 lected by H. B. Medlicott were identified by F. Stoliczka (Mem., 

 Geol. Surv., hid., VII, 181, 1869) and regarded as having a facies 

 similar to that of the Utatur stage on the Coromandel coast. 

 The Cretaceous beds of Tharia Ghat (25° 11' ; 91° 48') contain 

 also many Ariyalur fossils (he. ait., p. 183). 



Cheyyeru (Cheyair) series.— The thickest of the series forming 

 the Cuddapah system, so named by W. King (Mem., Geol. Surv., 

 hid., VIII, 127, 1872) from the river Cheyyeru which traverses 

 the series in the Cuddapah district. Composed of — 



(a) Nagari quartzites ) 



Chidamu beds. — One of the sub-divisions of the middle Spiti shales 

 including fossils of Kimmeridgian and Lower Tithonian age. 

 The name was introduced by C. Diener (Denk. h. Akad. Wiss. 

 Wien., Math.-naturw. Classe, Bd. LXII, 587, 1895). The 



(b) Pullampet slates t About ^ 



