NINNIYUR— OPHIOERAS. 89 



Nyauilgbaw beds. — Name given by T. H. D. La Touche (Director's 

 General Report for 1899-1900, 82) to red or chocolate brown 

 limestones with interbedded red clays covering a very restricted 

 area in the Northern Shan States which contain fossils of Upper 

 Ordovician age (F. R. Cowper Reed, Pal. hid., New Ser., Vol. II, 

 Mem. No. 3). The beds are described {Mem., Geol. Surv., Ind., Vol. 

 XXXIX, 121, 1913) as the formingnppermost division of the 

 Ordovician. The village of Nyaimgbaw (21° 51 ; 96° 21') is in the 

 Northern Shan States. 



Obolus beds. — See Neobolus beds. 



Oldhamite. — Name given by N. Story Maskelyne (Phil. Trans., 1870, 

 195) after Dr. T. Oldham, first Superintendent of the Geologi- 

 cal Survey of India, to a mineral (calcium sulphide) occurring in 

 the Basti meteorite. 



Olive group. — Name used by A. B. Wynne (Mem., Geol. Surv., Ind., 

 XIV, 104, 1877) for the Cardita. Beaumonti beds of the Eastern 

 Salt Range. With the Cardita Beaumonti beds Wynne seems 

 to have included boulder beds belonging to the much older Speck- 

 led Sandstone series (cf. Waagen : Rec, Geol. Surv., Ind., XIX, 

 22, 1886 ; Warth : Ibid., XX, 117, 1887). See Conularia beds. 



Olive shales. — The Cardita Beaumonti beds of Sind, on account of 

 their colour, are sometimes referred to by this name, but the 

 name has no technical value. 



Oman series. — Name proposed by G. E. Pilgrim (Mem., Geol. Surv., 

 Ind., XXXIV, 7, 9, 1908) from the district of 'Oman (Arabia) 

 for a series of rocks consisting for the most part of limestones 

 varying in colour from black to grey, with fossils at certain local- 

 ities indicating ages from Carboniferous to Trias. 



Oolitic Series. — One of the rashest examples of attempting 

 prematurely the identification of Indian beds with the standard 

 stratigraphical scale of Europe is that due to H. J. Carter, who 

 (Geol. Papers, 1857, 651) grouped under this name various rocks 

 ranging in age from the Crystalline complex to the uppermost 

 Gondwanas of the Geological Survey. 



Ophiceras beds. — Name applied by H. H. Hayden and A. v. Krafft 

 from the characteristic Am monoid genus to the second fossili- 

 ferous zone of the Lower Trias of Spiti, which is, however, so 

 intimately connected with the overlying Meekoceras beds as to 

 be almost indistinguishable. For a summary of the data and 



