NERBUDDA DISTRICT. 131 



of the Betul and Chindwarra districts which is included in the south of 

 our aiap, again near Mandla, and again in the Johilla and Mahanuddi 

 vallies far to the east. 



They must moreover attain a great thickness, although it is difficult 



to arrive at any very definite or satisfactory con- 

 Thickness, great. . . nmiii 



elusions on this point. I he beds almost invaria- 

 bly dip at very high angles, after appearing vertical, and their outcrop 

 may be crossed for miles continuously at right angles to the strike : but 



when the section across them can be clearly seen, 

 Recurring beds. ■•'/•• • • 



beds of a certain texture or composition ai*e found 

 to recur at certain intervals, suggesting that great anticlinal and syn- 

 clinal folds of the whole series have caused these recognizable beds to be 

 thus repeated again and again at the surface. 



It is clear that to render this kind of evidence conclusive the 



_.„ , .., ..-. identification of these recognizable beds must be 



Difficulty or identinca- ° 



twn - very close and complete if it be our aim to esta- 



blish the fact that the different outcrops do certainly belong to the same, 

 and not to merely similar, beds. 



Besides which, the amount and direction of the dip at one out-crop, 

 together with accurate measurement of the distance between this and 

 the supposed second recurrence at the surface of the same bed must be 

 carefully determined, as a preliminary to estimating the thickness of 

 the repeated series : all which could only be effected by more detailed 

 examination than has been given and could only be recorded on a map 

 far more accurate than any at the disposal of the geological survey, 

 or than any which the Surveyors could* under the circumstances, con- 

 struct. 



We sometimes, however, find a section which so strongly suggests the 



probability of this repetition of the beds, as almost 

 Probably identical, 



to prove it to be a fact, although the evidence 



cannot be said to amount to a complete and satisfactory demonstration. 



