DISANG— DUMMAPETT. 45 



junction with the schists. These features indicate an eruptive 

 origin for this rock and account for its appearance at different 

 horizons in the schists, its occurrence in roughly lenticular bosses, 

 as well as in thin sheets intruded between the schist folia. 



Dothak series. — Limestones, sandstones, quartzites, slates and 

 shales near Dothak (27° 37' ; 89° 6') in Eastern Tibet 

 described and named by H. H. Hayden (Rec, Geol. Surv., 

 Ind., XXXII, 162, 1905 ; Mem., Geol. Surv., hid., XXXVI, 141, 

 1907). The rocks underlie Jurassic shales. Although the 

 fossils found were too fragmentary for determination, the 

 beds were considered as possibly in part Triassic. Subsequently 

 (Geog. and Geol. of the Him., part IV, 234, 1908) they are 

 doubtfully referred to the Kanawar system (q. v.). 



Dravidian group and era Name proposed by T. H. Holland 



(Trans. Min. and Geol. Inst., Ind., I, 49, 1906 ; Imperial Gazetteer 

 of India, New Ed., I, 56, 64, 1907) for the part of the stratigra- 

 phical scale in India between the Purana and the Aryan groups, 

 that is, from the base of the Cambrian to the conspicuous break 

 which occurs in Upper Carboniferous times. This local group 

 therefore corresponds to the whole of the European Lower Palaeo- 

 zoic and part of the Upper Palaeozoic. 



Dllbrajpur Stage. — A band of sandstones and conglomerates, under- 

 lying the Eajmahal series, named by T. Oldham (Pal. Ind., Ser. 

 II. Vol. I, 1, 1862) from a village in the Rajmahal hills 

 (24° 26' ; 87° 31'). For a full description, see V. Ball (Mem., 

 Geol. Surv.. Ind., XIII, 198, 1877). 



Dudkur infra-trappean beds.— Term applied by W. King (Mem., Geol. 

 Surv., Ind., XVI, 205, 1880) to the Lametas of the Godavari 

 district containing a distinctly estuarine fauna in limestones 

 and calcareous sandstones from a village (17° 2' ; 81° 38') of 

 that name. 



Dummapett sandstones.— Name introduced by W. King (.Rec, Geol- 

 Surv., Ind., Vol. X, 56, 1877) for an upper sub-division of the 

 Kamthis in the Godavari district. Later (Mem., Geol. Surv., 

 Ind., XVI, 205, 1880) he drops the term and seems to consider 

 the whole as one formation under the name Chintalpoody 

 sandstones. (See also Mem., Geol. Surv., Ind., XVIII, 115, 

 116.) 



