12 HUGHES : SOUTHERN COAL-FIET.DS OF REWAII GONDWANA BASIN. 



valleys the presence of ferruginous matter was in some cases testimony 

 enough to determine the affiliation of the rocks, hut t bis again was perhaps 

 due to the imperfect measure in which their palajohotanical resources were 

 explored, aud evidence was passed bye, that might have tempered its 

 value as a decisive index. 



CHAPTER II. 

 IDENTIFICATION AND DISTRIBUTION OF ROCKS. 



SECTION IV. — METAMOItPHIC AND BIJAWAR. 



The Metamorphic series apppears occasionally along the southern 

 margin of the basin, between Lora and Umaria, 



Metamorphic. . . T „ ... _ r _ , . 



in the Johilla Valley, at Ragnalwari, where the 

 proposed railway line crosses the Basar stream, in the south-eastern 

 part of the Sohagpur district, and in Korea and Jhilmili. 



The inlier west of Umaria, forming the western shore margin of the 

 Umaria coal-field, is of considerahle significance in any speculative 

 discussion on the facility of reaching the ccal measures, presuming their 

 extension in the direction of the Mahanadi. Tlie cropping up of the 

 Metamorphic rocks at Lora points to the probability that the floor of 

 deposition of the Gondwaua formation is at a shallow depth from the 

 present surface. 



The Bijawars, represented almost entirely by silicious limestones, are 

 confined to the strip of land between the Ma- 

 lja " ' hanadi and the Machrar stream. With some 



modifications, the geological lines are those of Mr. C. A. Hacket's map. 

 The only addition to the former known exposures is a small inlier 

 near Narwar. • 



SECTION V. — TALCHIR. 



Although the Bijawar rocks are more recent than the Metamorphic 



Talchhs not seen in SerieS > {t S0 ha PP ens that the Talchirs are no- 

 contact with Bijawars. where seen to be in contact with them. They 

 ( 143 ) 



