CHAKRATA— CHARNOCKITE. 



33 



cannot be marked. The area originally described is about 30 

 miles east-north-east of Baroda. 



Chappar Shales. — Name, derived from the Chappar Rift near Harnai 

 in Baluchistan, used by R. D. Oldham (Rec, Geol. Surv., hid., 

 XXIII, 93, 1890) for beds afterwards considered to be equivalent 

 to the upper part of the Belemnite beds (Rec, Geol. Surv., 

 Ind., XXV, 19, 1892). 



Chari group. — Name used by F. Stoliczka (unpublished report) for 

 one of the divisions of the Jurassic of Cutch (Kachh). Chari 

 (23° 34' ; 69° 19') is the name of a village 32 miles north-west 

 of Bhuj, from which fossils were first obtained by Captain Grant 

 (Geol. Trans., 2nd series, V, 1840). The group has been divided 

 into four sub-divisions characterised by lithological differences 

 and fossil contents. W. Waagen (Pal. Ind., Ser. IX, Vol. I, 

 1873) gives the ammonite zones. 



i. Oolites (Dhosa oolites) Zone of Amaltheus >. 



cordatus. I Lower 



Zone of Amaltheus I Oxfordian. 



with Stephanoceras 

 polyphemus, Peri- 



sphinc.tes indogermanus, 

 Aspidoceras perar- 



malus, etc. 



3. White limestone with 

 Peltoceras athleta, Op- 

 pelia bicostatus, etc. 



2. Shales and ferruginous 

 nodules with Peris- 

 phinctes anceps, P. oblu- 

 sicosta, Harpoceras 



lunula, etc. 



1. Shales with calcareous 

 bands and locally 

 golden oolite with 

 Stephanoceras macro- 

 cephalas, lumidus, etc. 



lamberti. 



Zone of Peltoceras 

 athleta- 



Zone of Peri- 

 sphinctes anceps. 



Zone of Stephano- 

 ceras macro- 

 cephalus. 





y Callovian. 



Charnockite.— Named by T. H. Holland (Journ. As. Soc., Beny., 

 LXII, 162, 1893) after Job Charnock, the founder of Calcutta, 

 whose tombstone (1695) was the first specimen of the rock de- 

 scribed. It is essentially a hypersthene-granite of sp. gr. 2"67 s 

 composed of hypersthene, microline, quartz and iron-ores, with 

 about 75 per cent. Si0 2 ; 11 — 13 per cent. A1 2 3 ; 5 per cent. 

 FeO and Fe 2 3 ; 0"65 per cent. MgO ; 0-75 per cent. CaO ; 6 per 

 cent. K 2 and 1'5 per cent. Na 2 0. 



