TATAPANI AND SKXDIJK RIVKR SKCTIOXS. 31 



24. Friable coarse-g'raiued fc4spatlnc sandstone with bauds of 

 / . 



iron ore. 



23. Sandstone and shales. 



22. Band of iron ore, 1 foot 6 inches. 



T^ Raniganj— r-contd. { ^-'- Calcareous, friable quartz sandstone, 1 foot 7 inchef;. 



20. Conchoidal grey clay shales, 9 inches. 



19. Grey sandstone, micaceous, with carbonaceous markings, 



occasional nodules of clay iron ore. The thickness is 



not seen, but about 8' is exposed. 



,^ _ „ ( 18. Ferruginous sandstone and bands of red iron ore. 



D.— Ieon Shales . ] 



i. 17. Iron shales with clay iron ore band. 



The entire thickness of the Raniganj series in this field is 1,550 feet, 



thus considerably exceeding" the Barak ars. Further 

 Raniganj. 



west I observed that the Raniganj^ of precisely 



similar lithological character and containing typical fossils, thins out 

 considerably and the Barakars are developed in greater force. The gen- 

 eral dip is the same as that of the Barakars, namely, about 20° west 

 or south-west, strike nearly from north to south. The physical conditions 

 under which the Raniganj were deposited must have b^en very different 

 from those prevailing during Barakar times, at least in this field. 

 Instead of dark bituminous clay shales and fine brownish-yellow sand- 

 stones with coal-seams, we meet here generally felspathie sandstones, 

 ferruginous shales and bands of iron ore, resting on the characteristic 

 micaceous ashy-grey sandstone bed No. 19. No trace of a coal-seam is 

 visible, and, though I have found no fossils in this section, it is not 

 difficult to identify this series with typical Raniganj elsewhere well 

 developed in the coal-field. 



The following series of Panchets begins with a contact bed made up 



of boulders and debris from the beds beneath 

 Panchets. 



No. 29, and from this point the dip gradually 



decreases to about 15° south-west, the strike turning more to the north- 

 west to south-east ; the total thickness of the group in this section is 

 about 1,300 feet. The beds composing it can readily be distinguished 

 from those forming the Raniganj. They are, as seen in the accompany- 

 ing section, chiefly clays, variegated or red, alternating with shales and 



( 159 ) 



