Chap. I.] history of geology. 17 



" that we should expect to find the geological equivalents of the English 

 " series of coal measures to square exactly in detail with those in a 

 " distant country like India." 



The coal at Sangamahal is noticed., but Mr. Williams does not appear 

 to have known of the remarkable section on the Kudia, South of Nirsha, 

 nor to have visited the extreme "West of the field. 



The beds at Jariagarh, West of the Raniganj field, are stated to 

 possess the same lithological characters as those developed at the base of 

 the Damdda field. 



" The greenish-grey argillaceous shales, constituting the fundamental 

 " rocks of the series, are also seen at Jurreahghur to occupy the base 

 " of the measures ; and, supporting beds of conglomerate and quartzose 

 " sandstones, are thick beds of coal, stated in my first Report to have a 

 " thickness of at least 40 to 50 feet." 



A section of 837 feet, from the neighborhood of Lalbazar, East of 

 the Barakar, and embracing the uppermost portion of the lower coal- 

 bearing series, is given, and compared with the section previously given 

 from the neighborhood of Taldanga, West of the Barakar, and about 

 6 miles distant. The identifications of coal seams are, however, for 

 reasons already mentioned, open to much doubt. 



Mr. Williams has thus nearly completed the circuit of the field. A 

 few remarks on the coal seams, &c, of Lalbazar, and the bands of beds 

 of the lower measures extending thence to the Adjai, and recurring 

 through the intervention of a fault North of that river, in the neigh- 

 borhood of Kasta, Afzalptir, &c, conclude the description. Mr. 

 Williams calls attention to the occurrence of a " fresh water lime- 

 stone" containing unios on the East of the Barakar, near Ramnagar, 

 and its identity with the kunkur of the plains of Bengal, and he also 

 describes the greenish-grey shales with calcareous nodules (Talchir 

 beds) near Dabur North of Samdi, and observes their absence at the 

 base of the series North of the Adjai, near Afzalpur, &c. 



