4 GEOLOGY OF THE SON VALLEY, I TC. 



Chapter II.— STRATIGRAPHY. 

 (R. D. Oldham.) 

 The oldest rocks in the area under description belong to that 

 complex of unfossiliferous and more or less 

 Transitions .^Bijawtr metamorphose d rocks to which the name transi- 

 tion is applied for want of a better one, and 

 of these by far the greatest portion may be ascribed to a series 

 of slates or schists, associated with volcanic beds and jaspers which 

 resemble in general type the Bijawar series of Bundelkhand. The 

 petrology of these rocks of Bijawar type, or rather of the more 

 peculiar members of the series, has been studied by Mr. Vredenburg, 

 whose description is printed in Chapter IV of this memoir. 



Besides the Bijawar series, as it maybe termed, there is at least 

 one series of later age included in the area 



Newer conglomerates. # 



coloured as transition. The distribution of 

 these rocks could not be worked out, the area they cover seems 

 comparatively small, but their distinctness is conclusively proved 

 by the occurrence of pebbles of Bijawar jasper, and especially of 

 the very conspicuous and easily recognisable red jasper of that 

 series, in the basal conglomerate of the newer series. 



The principal exposure of these rocks is between Long. 82 and 

 82°3o' E., where they occur immediately south of the narrow strip 

 of newer rocks. Other exposures are known, but it was not found 

 possible to map them as a distinct series owing to the difficulty of 

 separating any but the basement beds from the older transitions. 

 It is in fact somewhat doubtful whether they should not be classed 

 rather with the newer series of sedimentary rocks which will be 

 described later on, but the difficulty of separating them from the 

 transitions, as compared with the comparatively well-marked distinct- 

 ness of the newer series, has influenced the decision, and they are 

 treated, as they were necessarily mapped, as belonging to the transi- 

 tions. 



The relation of these newer transitions to the granitic intrusions 



has not been made out as they have not been 



R-to tt5S2! ,ilk found in contact with each other, but with this 



possible exception that the newer transitions 



( 4 ) 



