104 Memorandum on the Geological structure [No. 2. 



Bamunee, flowing more Southerly into the Bay of Bengal, the 

 sources of which rivers or their tributaries, are all within a short 

 distance of the station of Chota Nagpore. The table-land extends 

 in a North East direction from Euttunpore* of (great) Nagpore 

 through Juspore, the North West extreme of Singhbhoom, Tamar 

 and Pachete to the Trunk Road East of Purusnath, the Southern 

 termination of it is generally rather abrupt from Euttunpore to the 

 neighbourhood of Singhbhoom, where lofty ridges stretch South from 

 it. Again it resumes its character in Tamar, where it is marked by 

 the rivers Kanchee and Kurkurree, tributaries of the Sooburno 

 Eekha. Further East the terminations appear to be more gradual. 

 The Southern slope is generally covered with jungle, consisting of 

 sal and other trees common to Bengal, intermixed with bamboo of a 

 description which does not attain any great size. 



South East of the table-land above described, schists, slates, old 

 sandstones and others, which may all be called metamorphic rocks, 

 are met. The appearance of these rocks varies greatly according to 

 their proximity to the igneous rocks which underlie, overlie, or 

 pierce them. Below the table-land, gneiss ceases to be the principal 

 rock, but still occasionally shows itself. It is seen as far East as the 

 neighbourhood of Bancoora, and South to the frontier of Mohrbunj 

 in the tributary mehals, possibly further. The quartz gravel still 

 abounds, and is in many places so rich in iron as to be smelted. 

 In other places the quartz appears to be entirely replaced by oxide 

 of iron and nodular or magnetic iron ores. 



In this region the metamorphic rocks are every where pierced 

 with dikes of green stone trap and allied rocks, most of which are 

 extremely rich in iron. This fact I learnt to my sorrow from 

 numerous triangulations made with a view to the compilation of a 

 map during my tours in the district, having been rendered useless 

 by the effect of local attraction on the magnetic needle, which I had 

 not leisure to investigate. The greenstones disintegrate into a rich 

 ferruginous earth, containing a black iron sand which is attracted by 

 the magnet. The greenstone hills are generally long dikes running 

 in a Northerly and Southerly direction, and are chiefly of little 

 altitude ; but in some places they attain a considerable elevation. 

 * 1,539 feet above the sea. 



