NERBL'DDA DISTRICT. 149 



In the Geological Survey Report on the Outtack district* there has 



been described a series of deposits having near its base a Boulder bed, and 



green muds, and on which the beds of the Damuda group unconforma- 



bly rest. In Central India, there is at the base of the series a group of 



deposits lithologically, and in general habit, strikingly like these Tal- 



cheer beds. They have therefore been separated 

 Unconformity of Tal- . 



cheer* group, obscure in from the lower Damuda Rocks above on the 



strength of these lithological resemblances, al- 

 though no similar unconformity seems here to divide them. On the 

 contrary, it has been found impossible to draw any line between the 

 Boulder bed, and other beds which contain the remains of Glossopteris, 

 Vertebraria, Phyllotheca, and plants common in the Damuda formation 

 and not known to occur in the Talcheer beds. 



A more extended knowledge of these formations may enable us to 

 establish a physical line of demarcation between the Talcheer and the 

 Damuda Rocks of Central India, but for the present it will be sufficient 

 to point out its possible existence, treating meanwhile the Talcheer and 

 Lower Damuda groups as one. 



In all the best sections which we have and wherever there is reason to 



.. L , , suppose that the bottom of the series is exposed, the 



Never overlie the Lower ir 



Damuda " rocks belonging to our sub-divisions, a, b, and c are 



found to underlie all the other beds. They are invariably, even when feebly 

 represented, found at the base of the series ; nor have any of the beds in- 

 cluded under d, e, and /, been ever seen to rest on the schists or granite. 

 Commencing from the west of the larger map, some rocks of this section 



may be seen south of Lokurtullye. The Morun 

 Morun Riverbeds _,. , , „ , T ,-. •, 



River exposes some beds of the Lower Damuda 



series ; shales, flags and sandstones, and a bed of poor coal,f come to the 



* Memo. Geol. Surv. of India, Vol. I. 

 f With respect to the coal seen here we may remark that it is at its out-crop about 

 3 feet thick but very much impregnated with pyrites; a strong efflorescence of sulphur 

 and of Alum covers its exposed surface, as well as that of some of the accompanying shales- 



