Chap. I.] history of geology. 21 



correctly. From his vertical section we may take the following as 



an abstract : — 



Upper Measures. 



Feet. 



Beds of Singharun Valley ... ... ... ... about 1,500 



Ditto Raniganj, Narrainkuri, and Rogonatk chuk ... ... 500 



2,000 



2,300 







5,300 







1,000 



2,500 





700 







3,200 







11,500 



Middle Measures. 

 " Measures containing red marl unexplored" ... ... ... 800 



Ditto ditto Mariilia and Bagalgoria coal ... ... 1,600 



Ditto ditto Salunchi (Chinafairi new) coal ... 600 

 Ditto ditto Chinakuri ditto, and tlience to top of 



the carbonaceous shales, containing ironstone, including 

 all the beds seen North-west of Chinakuri, the Nuclia 

 coal, &c. ... 



Carbonaceous shales and ironstones 



Lower measures 



Conglomerates and greenish-grey shales (Talchir) ... 



* 

 Total 



It will be seen that, although some difference in the exact figures 

 may occur, the above has, in the main, been perfectly confirmed by the 

 results of the present survey — always with the exception of the upper 

 measures of Mr. Williams, which will be shown to be equivalent to the 

 beds in the neighborhood of Chinakuri forming the central parts of his 

 middle measures. 



2nd. — The great faults cutting off and bounding the coal-bearing rocks 

 on the South and West were correctly determined and mapped, and the 

 general geological structure of the field and its Southerly dip clearly 

 shown by the sections. 



3rd. — The various coal seams were, in many cases first discovered, in 

 all cases first mapped. Several additional seams have, however, been 

 discovered since Mr. Williams's survey. 



4#i.— Many of the errors of Mr. Homfray and of the Coal Com- 

 mittee were exposed and corrected. 



