24 HOLLAND AND TIPPER : INDIAN GEOLOGICAL TERMINOLOGY. 



occurrence of V elates schmideliana Chemn. indicates an Eocene 

 age for these rocks. 



Bawar series.— Name given to a series of quartzites in north-east 

 Jaunsar by E. D. Oldham (.Rec, Geol. Surv., Ind., XVI, 197, 

 1883). Considered at the time to be of Tertiary age, but after- 

 wards (Rec, Geol. Surv., Ind., XXI, 137, 1888) grouped with the 

 Mandhalis in the " Carbonaceous " system. 



Bawd win volcanic Stage.— Originally called the Bawd win grits 

 and rhyolites by . T. H. D. La Touche (Rec, Geol. Surv., Ind., 

 Vol. XXXVII, map, pi. 23, 1909) but changed to the above in 

 his Memoir on the Geology of the Northern Shan States (Mem., 

 Geol. Surv., Ind., Vol. XXXIX, 55, el sea.). The series consists 

 of rhyolitic flows and tuffs, and has been extensively mineralised 

 in the neighbourhood of Bawdwin (23° 6' ; 97° 20'), the locality from 

 which the name is derived. The beds are undoubtedly pre-Ordo- 

 vician, and are considered to form part of the Tawng-peng system. 



Baxa Series.— Named by F. R. Mallet (Mem., Geol. Surv., Ind., XI, 

 12, 33, 1875) from the hill fort of Baxa (26° 45' ; 89° 38') in the 

 Western Duars. The rocks consist of unfossiliferous quartzites, 

 slates and dolomites which were noticed to resemble the Krol rocks 

 of the Punjab Himalayas, but their age with, reference to the 

 Damuda beds in the Darjeeling area was not satisfactorily estab- 

 lished. They are now regarded as representatives of the Purana 

 group. 



Bedesar beds. — A division of the Jurassic rocks of Jaisalmer recog- 

 nised by R, D. Oldham (Rec, Geol. Surv., Ind., XIX, 158, 1886). 

 Named from the village of Bedesar (27° 3' ; 70° 49') north-north- 

 west of Jaisalmer. The beds are of purplish or reddish sand- 

 stone with bands of calcareous sandstone and thin layers of black, 

 vitreous, ferruginous sandstone ; they contain a few fossils similar 

 to forms from the Katrol group of Cutch. 



Behar transitions. — See Bihar transitions. 



Bel dongrite.— Mineral named by L. L. Fermor (Mem., Geol. Surv., 

 Ind., XXXVII, 115, 1909) from Beldongri (21° 20' ; 79° 21'), 

 Nagpur district, Central Provinces, where the mineral was found 

 in the manganese-ore deposits. Composition, 6 Mn g 6 . Fe 2 O s . 

 8 H,0. It is a variety of psilomelane, and the name is regarded 

 as of provisional value only. 



Belemnite beds.— A self-explanatory term used by E. D. Oldham 

 (Rec, Geol. Surv., Ind., XXV, 19, 1892) to distinguish a 



