40 MALLETj VINDHYAN SERIES. 



No. 8 includes a considerable amount of shales^ in the lower part 



of which there is, nearly always, a thick band of 

 8, Shales and sandstone. . mi i i i i j^i i 



massive sandstone. The shales below the sand- 

 stone are quite similar to those of 6, and may equally well be regarded 

 as forming", with them, one sub -division, in which the limestone, 7, occurs 

 as a more than ordinarily thick band. The classification given at page 28 

 is, it must be remembered, purely a lithological one, framed for conveni- 

 ence in a series where lithological distinctions are generally far from 

 being clearly defined. The sandstone is of trifling importance in the 

 east, and would seem to be absent, or nearly so, at Burdhee. About 

 Rajgur, however, it begins to occupy a prominent place, and thenca 

 continues westwards for a distance of 100 miles. All along it caps the 

 Keinjua range, which indeed chiefly owes its existence to the hardness of 

 this rock. In the neighbourhood of E/amnuggur, the Keinjua hills face 

 the Sone with a scarped face almost rivalling in magnitude that of the 

 Kymore range itself. In the extreme west this band of rock dies out, or 

 sphts up into minor ones, and in consequence the hills come to an end close 

 to Bijragoogurh. LithologicaUy the sandstone is very similar to the Ky- 

 more. The shales, mediate between it and the limestone above, seem to be 

 constant throughout the Sone valley. Fine sections of them are to 

 be found about Burdhee, where from their black color, they have been mis- 

 taken for coal, and pits have been sunk for its extraction. They are re- 

 markable for containing, especially near their junction with the limestone 

 above, numerous calcareous concretions, nearly black in color, very hard and" 

 compact, and breaking with highly conchoidal fracture. These include 

 no nucleus, but are sometimes starred by cracks filled with calcite, like 

 septaria. They are not concentric, but finely laminated like the shale 

 itself, although this structure can only be seen on a broken and weathered 

 surface. The normal shape is lenticular or oval, but the molecular 

 force which caused the lime to segregate in any one concretion exerted 

 ( 40 ) 



