50 JONES : SOUTHERN COAL-FIELDS OF SATPURA GONDWANA BASIN. 



To the east the Moturs thrown down by the Pench fault are ex- 

 posed near Harai, Chinda, and Sirgora. 



§ 17. — Inter- or infra-trappeans. 

 Above the Moturs there is a great thickness of rocks which I have 

 not yet studied, but which have been partially described and classified 

 by Mr. H. B. Medlicott. 1 At the eastern end of the field, however, on the 

 hill above Sirgora, between the Barakars and the trap, there is a bed 

 of rock not exceeding 20 feet in thickness, and consisting of a hard 

 conglomeratic sandstone containing white quartzite and red jasper peb- 

 bles. The same rock is again seen on the hill above Babeye (E. Lon. 

 78°59'),and on the hill on which Garha stands (E. Lon. 79 2') 

 where it is very hard and siliceous, and in the river by Thesgora 

 (E. Lon. 79" 1') and Mohli, in these cases being between the meta- 

 morphics and the trap. It is probably of Infra- or Inter-trappean 

 age, but from its position and the absence of fossils it is impossible 

 to say more with certainty than that it is older than the trap which 

 occurs above it. 



§ 18.— Trap. 



The trap rock, which is of the usual basaltic character, occupies a 



large area. It is found capping the whole of the 

 Superficial trap. 



Motur hills, and many of the lower hills to the 



south. 



There are numerous dykes running approximately east-west, where 

 they appear on the surface, but in few cases are 

 they traceable continuously for any long distance, 

 though at times a continuation of the same dyke is to be found fur- 

 ther on in the same line. In many cases they are certainly due to 

 intrusion along the bedding planes of the rocks through which they 

 come to the surface, and this is especially evident in the case of the 

 long dyke which crosses the Tawa near Saidal Gondi (E. Lon. 78°25'), 

 and the dyke north of Gorak (E. Lon. 78 32') which is exposed for 

 some distance in the banks of the stream crossing it. The section 

 1 Mem. Geol. Surv. India, X, 2, 133. 



( 5° ) 



