Chap. IV, § 2.] lower damtjda group. 65 



Brought forward... 3,271 4 



135. Inferior coal and bituminous shale mixed, found in shaft No. 1 20 



136. Dark-gray under-bed ... ... ,,. ... 6 



137. Hard and compact gray sandstone, conglomerate ... ... 60 



138. Black siliceous rock, with a conchoidal fracture, and contain- 



ing flakes of vegetable charcoal ... ... ... 21 



139. A bed of inferior coal ... ... ... ... 15 



140. G-ray argillaceous shale, with thin beds of sandstone ... ... 26 



141. White and light-gray sandstone, conglomerate, containing 



boulders of white quartz 12 inch diameter ... ... 325 



142. Greenish-gray argillaceous shale, alternating with thin beds of 



sandstone ... ... ... ... 200 



143. Greenish-gray argillaceous shale, containing large concretions 



of gray limestone ... ... ... ... 153 o 



4,097 4 



The first six beds of the above, embracing a thickness of 993 feet, 

 belong to the ironstone shales; the beds 141, 142, 143, being 678 feet, 

 belong to the Talchirs. Thus the thickness of the Lower Damtida 

 group is, by Mr. Williams's measurements, 2,426 feet. This is probably 

 very nearly correct, but as it may be slightly too high, 2,000 feet may 

 very safely be taken as the minimum thickness. 



The above section shows the existence of fourteen beds of coal 

 known to equal or exceed 3 feet in thickness ; of these, however, 

 several are of similar quality to those already mentioned as occurring 

 in the neighborhood of Barmuri. It has not always been found pos- 

 sible to recognize the seams mentioned by Mr. "Williams, probably in 

 consequence of the out-crops having been covered by changes in the 

 course of the stream, since the time of his visiting the locality. 



No. 10, which is called the Chanch seam, is probably that now work- 

 ed at Dumarkhunda, the identification of which 

 Dumarkhunda seam. 



with the Chanch seam is doubtful, the latter being 



probably higher in the series, and nearer the base of the ironstone 

 shales. The Dumarkhunda seam has hitherto only been worked on 



