MALLET, VINDHYAN SEMES. 13 



formation, as being best seen in the scarps of the Vindhyan range, and 

 divided it into subordinate groups, as follows, in descending order : — 



1. Bundair Sandstones and shales. 



2. Rewah Limestones, shales and sandstones. 



3. Kymore Sandstones, and limestones and shales.. 



These groups and the names then given to them have been retained 



ever since, being found well marked nearly everywhere throughout the 

 Vindhyan area yet examined, although it has been found necessary to 

 introduce some changes in detail. More recent explorations have modi- 

 fied the views then held respecting the faulted nature of the Vindhyan 

 southern boundary and the extension of the series to the eastward. 



In 1860 Mr. H. B. Medlicott published his report"^ 'on the Vindhyan 

 I860 Mr H B rocks and their associates in Bundelkund,^ in which, 



Medlicott. retaining Dr. Oldham^s groups, he proposed to 



classify tkem as follows : — 



1. Bundair Sandstones and shales, with limestones. 



3. Rewah Sandstone and shales. 



3. Kymore Sandstones and grits, or shales. 



Between the Vindhyans and the crystallines, and underlying the for- 

 mer, Mr. Medlicott found a series of limestones, shales and sandstones to 

 which he gave the name Semri, and pointed out their strong lithological 

 resemblance to a series of beds occupying a similar position in the Sone 

 valley to which he had previously applied the name siih-Kymore, remark- 

 ing at the same time, however, that closer examination might prove them 

 to be a downward continuation of the Vindhyans themselves. 



The same opinion was expressed by Mr. J. G-. Medlicott, by 

 1860, Mr. J. G. MedH- whom, although not strictly belonging to his 

 report, a short descriptionf of the sub-Kymores 

 and Vindhyans was given, which refers more especially to their develop- 

 ment along the northern margin of the Sone and Nerbudda vaUeys. 



* Mem. Geol. Survey, India, Vol. II. f Mem. Geol. Survey, India, Vol. II, p. 138. 



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