Chap. L] history of geology. 11 



up at high angles in the immediate vicinity of the boundary fault. But 

 they are distinctly confined to the North side of the faults, and belong 

 to one of the highest groups of sedimentary beds in the field. It was 

 a mistake to suppose them to have any connexion whatever with the 

 fault, or with the metamorphic rocks. 



The next five pages are devoted to an account of the distribution of the 

 gneiss and Other hypogene rocks, South, West, and North of the coal field. 



The description of the coal measures, which comprises the greater 



portion of the Eeport (from page 17 to page 92), 



Coal measures. 



follows that of the metamorphic rocks. It com- 

 mences by specifying the beds seen about Khyrasol, about 15 miles East 

 of Raniganj, where sandstones first rise from beneath the laterite 

 and alluvium of the delta which conceal them further to the East. 

 These rocks, as will be shown hereafter, are, in all probability, distinct 

 from all the beds associated with the coal, a fact of which Mr. Williams 

 was not aware ; he mentions, however, his having been unable to dis- 

 cover the least indication of coal, and relates the ill success of the 

 borings near Kaliptir, by the Bengal Coal Company and by Messrs. 

 Erskine and Co. 



The general description proceeds — " From thence (the neighborhood 

 " of Khyrasol) in a Westerly direction, towards the Barakkur, and subse- 

 " quently returning along the North bassets of the field." 



The occurrence of sandstones South of Andal, with a slight Northerly 

 dip, and the discovery of coal at Janjura, at a depth of 20 feet from 

 the surface, are considered by Mr. Williams as evidence that the whole 

 area between Andal, Khyrasol, Ukra, and Janjura contains coal 

 measures. The ferruginous conglomerate (laterite) of Baktarnagar is 

 mentioned, and a description, with sections, given of the rocks asso- 

 ciated with the coal of Mangalpur. The extension of the seam to 

 Harispur is correctly inferred from borings, but the line of outcrop shown 

 on the map, extending from Mangalpur to Harispur, is inaccurate. 



