6 BOKARO COAL-riELD. 



havc; it matters little, as they are probably only a few square yards in 

 extent and consequently mueh too minute to be laid down. Within tlie 

 main boundary of the field, the Talchirs are first met with near Tarrumbee, 

 represented merely by the bottom-conglomerate, which here possesses a 

 o-reen matrix much more siliceous than argillaceous in its composition. 



South of Peepradeeh and from thence west to Amlo and Karo, 

 the pebble beds of the Barakars form two, and 

 sometimes three, nearly parallel scarps at the foot of 

 which the Talchirs stretch near Chepree ; this series is better exposed here 

 than elsewhere in the east of the field. The conglomerate bed still 

 occupies its normal position, and above it a light yellowish, pale broWn 

 sandstone occurs. 



An inlier of metamorphic rock is seen on the road from Dhoree to 

 Chepree. The Talchirs to the north of it dip 

 away at an angle of 25°, but soon become nearly 

 horizontal ; those south of it are inclined at 8° and 10°. 



The line of boundary curves much owing to the irregular manner 

 in which denudation has occurred. It is natural up to Chepree, and 

 as far as Gobinpoor, where a cross fault shifts the rocks to the north. The 

 Talchirs as will at once be seen by inspecting the map, are overlapped in 

 many places ; and west of the Koonar are only seen as outliers beyond the 

 main body of the fi.eld, until we approach the villages of Mando and 

 Indra-Jarbah, where, owing to the removal of the overlying group, a 

 thickness of about 500 feet of strata of this series is exposed, and each 

 distinguishing feature is recognisable. In the Boodah stream a typical 

 section is visible : the conglomerate underlying all, and then the acicular 

 clays (needle-shales) , and very fine-grained sandstones succeeding. The 

 needle-shales are not so conspicuous as they were in the Jherria Field, 

 and their place is in a great measure taken up by sandstone, similar 

 to that noticed near Chepree. 

 (44) 



