60 HOLLAND AND TIPPER : INDIAN GEOLOGICAL TERMINOLOGY. 



showing oxides of Co, Sb and As, is at variance with this description.. 

 A substance stated by J. Middleton (Phil. Mag., XXVIII, 352, 

 1846) to have the composition Co.S appears to have been the 

 origin of the idea that a mineral species of the kind exists among 

 the cobalt ores of Jaipur in Rajputana, and F. R. Mallet (Rec. 

 Geol. Surv. hid., XIV, 190, 1881), having found only danaite and 

 cobaltite among the minerals from the well known Khetri area, 

 considers that the existence of the species jaipurite needs verifi- 

 cation. 



Jaisalmer iimestones— Distinguished by W. T. Blanford (Rec. 

 Geol. Surv. Ind., X, 19, 1877) as one of the stages in the Jurassic 

 rocks of Jaisalmer, Rajputana. The limestones are highly fossili- 

 ferous and of about the same age as the Chari stage in Cutch. 

 (See also R. D. Oldham. Rec. Geol. Surv. hid., XIX, 159, 1886 ; 

 Manual, 2nd Ed., 227, 1893.) 



JammalatnadugU Stage. — The second stage of the Kurnool series, 

 including the Narji limestones and the Auk shales. Named from 

 the tahsil station (14° 51' ; 78° 26') on the west side of the Kundair 

 valley in the Cuddapah district (W. King, Rec. Geol. Surv. Ind., 

 II, 8, 1869 ; Mem. Geol. Surv. hid., VIII, 40, 1872). 



Jautisar system. — Named by R. D. Oldham (Rec. Geol. Surv. Ind., 

 XXI, 131, 1888) from the Himalayan state (30° 43'; 77° 54') south- 

 east of Simla. Formerly known (1883) as the Chakrata series (q. v.). 

 Divided into three divisions : the lowest, composed of grey slates 

 with a band of blue limestone ; the middle, composed of red 

 quartzites and slates ; and the uppermost division of trap and 

 volcanic ash. Unconformably underlies the Deoban limestone 

 system. Now regarded as a local development of the Purana 

 group which became involved in the Himalayan folds. 



Jhaktnari stage. — Term applied by F. Noetling (Director's General 

 Report 1900-01, 24) to the Upper Cretaceous as exposed in Sind, 

 including the beds with Cardita beaumonti. The name is derived 

 from a locality (26° 9' ;. 67° 55') in the Laki range. 



Jhiri shales. — The highest stage of the Lower Rewah series in the 

 Upper Vindhyans according to the classification of F. R. Mallet 

 (M.em. Geol. Surv. hid., VII, 27, 28, 1869). Named from a town 

 in the Gwalior State lying near the foot of the escarpment which 

 marks the outcrop of the beds. 



Jodbpiir sandstones. — Red sandstones doubtfully referred by 

 W. T. Blanford (Rec. Geol. Surv. hid. X, 18, 1877) to the 



