tXlchirs. 



L5 



right bank o£ the Johilla, but they can be traced for 4 or 5 miles 

 in the opposite direction, until they are overlapped by Lametas and 

 Banikars. 



Leaving the valley of the Johilla and proceeding eastward, no 



Talchir rocks are exposed until the edge of the 

 Sobagpur district. • i i • ,t p 1 ' ' i- j. • j - it 



main body in the feonagpur district is reached 



near Turri at the base of the trappean plateau. Here they are made up 



of the same varieties of beds as occur in the Damuda valley, and the 



green and yellowish silts are the predominant rocks. Excellent sections 



of them are visible in the Son, the Hesia, the Alan, the Tipan and other 



rivers ; and in several places I procured fossil ferns. 



There is a local modification of some of the sandstones, which I think 

 might mislead an observer who approached them with the ordinary 

 Talchir panorama before his eyes. 



Their appearance at all events was questionable enough to raise, in my 

 Sandstones modifica- colleague's mind when mapping them, a doubt as 

 tion— near Nindauan. to their true affinities. They occur on the isolated 

 hills east of Nindauan and are compact and vitreous-looking, like 

 quartzites; added to which, the accident of their resting on metamorphic 

 rocks, and being represented where first seen by a slight thickness, 

 strengthened the idea that they were members of the metamorphic 

 series. On examining them carefully, however, it became evident that 

 they were sandstones with the texture distinctly granular, not in the 

 slightest degree crystalline, but rendered close and hard by calcareous 

 matter. Eventually, decisive evidence of their specific character was 

 obtained in one of the streams near the village, where they were found 

 overlying a boulder-bed. 



Throughout an extensive tract in the southern part of Korea and 

 Jhilmili, the Talchirs are displayed in great force, 

 and many of the higher hills are partly constituted 

 of them. The boulder beds are more heavily weighted than they are in 

 the west, and as a whole the group is of more importance. The litholo- 

 gical characteristics, however, are unaltered, and it is therefore unneces- 

 sary to dwell upon them. 



( 151 ) 



