516 Scientific Proceedings, Royal Dublin Society. 
SATPURA BASIN.* 
The Satpura region, so called from one of the ranges of hills, 
consists of a hilly tract separating the valleys of the Narbada and 
Tapti rivers. 
It is difficult to speak of this area as a single expanse of coal 
measures, since, as a matter of fact, they only appear at intervals 
under the margins of younger groups, covering a wide extent 
of country which stretches for a distance of about 170 miles. 
Accordingly, the estimated dimensions of the basin vary much 
according to different authorities. 
About 2,000 square miles appears to be a safe minimum, but 
besides this it should be remembered that there is a considerable 
tract in which the underlying formations are concealed by the 
tertiary Dekan traps, and a large area towards Jabalpur, in which 
no coal measures have been proved to exist under the younger 
formations which prevail there. 
In this region the several groups of the Gondwana system are 
developed to their maximum extent. They have been named 
and classified by Mr. H. B. Medlicott as follows :— 
Upper Gondwana. 
Jabalpur Group : : : . 1,000 feet. 
Upper—Bagra, c : 3 7 COOR ie. 
Mahadeva : 
Series, | Middle—Denwa, : 7 5 te 2 OO Mar 
Lower—Pachmari, . : ; - 8,000. ,, 
Lower Gondwana. 
ne Upper yee ; : . Group 4,000 ,, 
pete. Motur, : : : 3G O00} es 
Lower—Barakar and Karharbari, : ms 500 ,, 
Talchir, ; 4 : ; 55) dl (OO) 
22,500 ,, 
It is not contended that this enormous thickness of rocks was 
ever successively deposited in vertical order in any one locality. 
The figures are to be taken as the maxima of the deposits of 
successive periods. 
The principal localities where coal measures occur, are near 
Mopani, and in the valleys of the Tawa and Pench rivers, the 
former is on the northern boundary. 
* J. G. and H. B. Medlicott, “‘ Memoirs Geological Survey of India,” Vol. I1., pp. 97, 
267; X., pp. 133, 188. Records Geological Survey of India,” Vol. III., pp. 63, 70, 
and VIIL., pp. 65, 86. 
