126 GEOLOGY OF THE SON VALLEY, ETC. 



About Bardi the rocks of the Kheinjua stage occupy a consider- 

 able area, and it may be well to correct a statement reproduced in 

 Mr. Mallet's memoir * that the limestone No, 7 as well as the beds 

 above and below are missing at Bardi. There is certainly a limestone 

 at Bardi, which might well be Mr. Mallet's No. 7, if there were any 

 constancy in a particular group of beds in this series, and there 

 is a considerable section of shales and sandstones intervening between 

 the shales with calcareous concretions and the beds of the por- 

 cellanite stage which is given as follows by Mr. Datta 2 :— 



Section N. by W. — S. by E. by Bardi. 

 (Descending order.) 



(a) Argillaceous shales, dark grey to blackish, containing calcareous concretions, pass- 



ing down into a thin band of finely laminated light grey to whitish shale with 

 crystals of quartz. Well seen on the left bank of the Son, north-west of Bardi. 



(b) Blank. 



(c) Thin-bedded sandstone (with an occasional thick bed), with subordinate bands of 



shales. These are the beds on which Bardi itself stands and are well exposed on 

 the right bank of the Gopat here. 



(d) Limestone with shales: composed of an upper band of grey, yellowish to pinkish 



limestone, thick bedded and cherty, succeeded by greenish argillaceous shales, 

 and these being underlaid by a thinner band of rather impure limestone with 

 intercalations of arenaceous layers. Well exposed on the right bank of the Son 

 at 2.\ miles W. by N. of Bardi; seen^lsoon the Gopat just south-west of Bardi 

 itself. 



(e) Shales, greenish (argillaceous as well as arenaceous), with thin-bedded sandstone. 

 (/) Blank. 



Porcellanites. 



North of the outlier of lower Vindhyans comes the third of the 

 Upper Vindhyan outliers of upper Vindhyans, that of the Dadri 



out,ier - plateau. The age of the sandstones com- 



prising this outlier is not so definitely proved as in the case of the 

 Kharara outlier, for they nowhere rest in unconformable contact on 



1 Mem., Geol. Surv. Ind., Vol. VII., p. 38. 



2 Rec, Geol. Surv. Ind., Vol. XXIX., p. 80. 

 ( 126 ) 



