14 BUNDELCUND. 



crystalline surface. This breccia is here seen in actual contact with 

 a fine earthy, thin bedded sandstone ; thicker beds coming in above." 

 The section just given is seen for several miles, unbroken, along the face 

 of this spur, and it exhibits well the perfect agreement between this up- 

 permost of the Semri groups and the Kymores ; that very peculiar junc- 

 tion bed, which seems to be the normal finale to the Tirhowan limestone, 

 testifies that, at many places at least, no denudation of this rock had taken 

 place : even in the absence of a decided breccia the surface of the lime- 

 stone looks as if it had been the original surface. This is seen on the 

 isolated mound near Cheboo, there being no covering rock ; also in the 

 face of the table-land S. W. of Paldeo, where the sandstone rests on the 

 limestone with but a trace of the breccia ; in the former locality there is 

 " a thin capping of purely siliceous rock, compact, opaque with irregular 

 cavities coated by hyaline or calcedonic quartz, sometimes sintery like 

 chert, also jaspery — not properly brecciated, although weathering 

 roughly. Its relation to the limestones is partially seen — while the lower 

 beds are but roughly jointed and unmixed, towards the top, they are 

 much cracked vertically and the interstices are filled by the siliceous 

 matter. There is no modification of the stone itself, and these cracks are 

 quite similar to what might be produced by dessication from the surface." 

 The rock associated with the Tirhowan limestone below, in this position 

 of the ground, is such as greatly to increase the difficulty of interpreting 

 the sections, on account of its similiaritv to, and occasionally intimate con- 

 nection with that limestone. Before noticing it however I shall say what 

 the nature of the section is. 



In sketching the lower Semri groups to S. W. where the Bijawurs 

 Section of °ranite are * ue underlying rocks I showed strong reasons 

 junc ion. £ or k e ii ev j n g that these were also boundary rocks, 



that those lower groups had never extended much beyond their present out- 

 crop; that this is in fact the edge of their basin of deposition. When the 

 granite becomes the supporting rock this arrangement is even more evident. 



