40 HOLLAND AND TIPPER : INDIAN GEOLOGICAL TERMINOLOGY. 



Daonella beds.— Term first used by C. L. Griesbach (Mem., Geol, 

 Swv., hid., XXIII, 66, 1891) for the lower part of the Upper 

 Trias of the Himalaya (cf. Diener, Denk. h. Akad. Wiss., Wien, 

 587, 1895). It was also used in the same way by Hay den and 

 von Krafft (Director's General Rep., 1899-1900, 193, 228, and 

 229). Later it was divided into — 



Daonella limestone 

 Daonella shales. 



(Diener, Mem., Geol. Sun., hid., XXXVI, Part 3, 13, 73, 1912.) 



Deccail trap. — The commonest form of rock among the great 

 Deccan trap-flows is a dark-green basalt without olivine in which 

 a basic plagioclase and augite are the chief constituents (C. A. 

 McMahon, Rec, Geol. Surv., Ind., XVI, 42-50, 1883 ; XX, 111, 

 1887). These traps frequently contain vitreous material and 

 sometimes palagonites (C. S. Middlemiss, Rec., Geol. Surv., Ind., 

 XXII, 226, 1889). The name is derived from dakshin= south, 

 the Deccan corresponding to that part of the Peninsula south of 

 the Vindhyan range. 



Delhi series.— Named by C. A. Hacket (Rec., Geol. Surv., Ind., 

 XIV, 281, 1881) because the quartzites which form such a pro- 

 minent constituent of the series continue from Rajputana to 

 the famous ridge near the city of Delhi (28° 39' ; 77° 17'). Con- 

 sists of a lower stage composed of slates and limestones and an 

 upper stage mainly of quartzites (Alwar quartzites). Consider- 

 ed by R. D. Oldham (Man. Geol. Ind., 2nd Ed., 1893, 71, 72) to 

 be equivalent to or in part younger than the Gwaliors. 



Detiwa Stage.— Named by H. B. Medlicott (Mem., Geol. Surv., hid., 

 X, 153, 1872) from the Denwa river, one of the rivers draining 

 the northern slopes of the Pachmarhi range in the Central 

 Provinces. The Denwa is the middle stage of the Mahadeva series 

 in the Satpura region, and is approximately equivalent to the 

 Kota-Maleri stage of the Godavari valley. 



Deoban limestone.— Named by R. D. Oldham (Rec., Geol. Surv., 

 Ind., XVI, 195, 1883) from the Deoban peak (30° 45' ; 77° 

 56') north of Chakrata. Pale-grey limestones, often dolomitic, 

 mephitic and sometimes oolitic, with cherty concretions. 

 Sometimes shows stromatoporoid structures which have been 

 found in similar dolomitic limestones in other parts of the 

 Outer Himalayas (cf. T. H. Holland, Rec., Geol. Surv., Ind., 



