10 RANIGANJ COAL FIELD. [CHAP. I. 



i( by thick beds of light-grey felspar, both soft and decomposed ; these 

 " beds appear to me to compose the contents of the great South or.boun- 

 " dary fault. Proceeding to the West, in the direction of Telindah or 

 " Medjeah, these trappean beds are composed of compact contempora- 

 " neous conglomerate, with a brownish-grey base, containing large 

 " rounded boulders and pebbles of quartz and granite of various colors, 

 " and occasionally pebbles of jasper and fragments of mica-schist : pieces 

 " of a similar conglomerate are found along the whole line of the great 

 " South fault, up to the base of Pachete Hills." 



This is in several points erroneous, it represents the " great South 

 or boundary fault" as being composed of ec nodular syenitic greenstone," 

 &c. The rocks South of the fault are frequently hornblendic, and some- 

 times syenitic, but the fault itself is a mere crack, despite its enormous 

 throw. It does not even contain a breccia, as is the case with many 

 *arge faults in the gneiss. The expression, these u trappean beds are com- 

 posed of compact contemporaneous conglomerate" &c, must either be a 

 misprint, or else have arisen from some mistake about terms, otherwise 

 it would involve a no less serious error than that of confounding toge- 

 ther metamorphic, trap, and ordinary stratified rocks. This is indeed 

 one of many cases in the Report in which the inaccuracy is, in all proba- 

 bility, due to the want of Mr. "Williams's supervision during publication. 

 In his map he has erroneously colored Beharinath, Garangi, and Pan- 

 chet Hills as gneiss ; and not only has he so colored these hills, which, 

 from their difficulty of access, he appears not to have examined closely, 

 but he has committed the same error with the small hill of Telinda, 

 on the banks of the Damuda, a little below Raniganj, although, from the 

 mention he makes of the spot, there can be no doubt that he visited it. 

 The only reason which can be assigned for this mistake is the circum- 

 stance of the coarse sandstones and conglomerates (which form all these 

 hills, and are very different in character from those prevailing in other 

 parts of the Raniganj field,) being frequently much contorted and turned 



