40 JONES: SOUTHERN COAL-FIELDS OF SATPURA GONDWANA BASIN. 



differing in character from those described in other fields. There is a 

 scarcity of fossils : the only localities where I obtained any were at 

 Hirunbhutta, Sirgora, and Bhandarea, but they are very fragmentary 

 and merely recognizable as plant remains. The thickness of the 

 Barakars where most fully exposed in the Tawa field does not probably 

 exceed 1,500 feet ; and the apparent thinness to the east, though to 

 some extent actual, is in places due to overlap of the Moturs, as between 

 the Barkoi and Hingladevi fields where the Motur clays come right 

 across the strike of the Barakars ; and though the overlap is obscure 

 the general appearance of the boundary is such as to suggest it. 



§ 16, — The Motur Group. 



Above the Barakars comes a group of rocks consisting for the 

 most part of mottled red, yellow, green, and white calcareous clays, and 

 white felspathic sandstones, which have been named the Motur group 

 by Mr. Medlicott. 



The clays are readily distinguished from all the rocks occurring 

 Red clays readily dis- among the Barakars; they are usually of a dark 

 tinguishable, re( j c i are t colour, sometimes greenish or yellow, 



and white, the various colours are mixed in small patches, so as to give 

 a mottled appearance to the whole rock ; the white portion of the 

 clay frequently contains a large quantity of white sand. 



One especial characteristic of the clays is their calcareous nature ; 



they contain numerous small plates of argillaceous 

 Calcareous nodules. 



carbonate of lime and larger nodular masses of 



very irregular shape disposed in horizontal layers in the clays. These 

 nodules when broken open are seen to consist of a matrix of argilla- 

 ceous carbonate of lime, with veins of crystalline carbonate of lime 

 filling up the centre and radiating irregularly towards the outer surface, 

 where they form hard ribs, which on exposed surfaces have resisted the 

 action of the weather better than the soft clayey portions, and thus come 

 to form slightly raised lines over the surface. Where any large thick- 

 ness of these clays has been subjected to denudation, as on the hill north- 



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