MALLET, VINDHYAlSr SERIES. 125 



roll at low or moderate angles, sometimes they are horizontal. To the 

 south of Dewulmurri, some 25 miles below the junction of the 

 Pranhita and Wm-da, dark grey silty shales, closely resembling the 

 mudstones of the Talcheers, and micaceous and sandy shales, similar to the 

 Vindhyan shales of the Dhar forest on the Nerbudda, are interstratified 

 with the sandstones ; all being quite unaltered. 



Occupying a large area in the region about the confluence of the 

 Wurda and Pein Gunga, one therefore distinct from and to the east of 

 that covered by the sandstones, limestones and shales are found (Pein 

 Gunga shales and limestone). The limestone is mostly a dark grey, 

 earthy rock, sometimes pink' or buflP, generally rather thin-bedded, but 

 occasionally more massive and the stratification less distinct. Chert 

 passing into jasper, sometimes ribboned, is often interbanded. The lime- 

 stone sometimes weathers on the sm-face into a peculiar rough wavy form, 

 apparently due to structure. To the north the dip is rather irregular^ 

 but along the vaUey of the Pein Gunga it is nearly or quite horizontal, 

 and is rarely steady for any distance. Numerous faults nevertheless 

 occur, which frequently bring the shales against the limestones. The 

 thickness of the latter would seem to be considerable. 



About five or six miles north of Edlabad an excellent section is found 

 in the Satt nuddi, which shows the Pein shales resting quite conforma'^ 

 bly on the limestone, the two being interbanded at the junction, and in 

 fact passing into each other. The shales are deep red, very fine-grained^ 

 with a somewhat nodular structure, and are much but irregularly 

 jointed. Thin beds of limestone frequently occur in them. Both shales 

 and limestones are quite unaltered and no fossils have been found in 

 either. The only place where these rocks and the sandstones were found 

 in contact was near Edlabad, where the sandstone to all appearance 

 dips imder the limestone. The boundaries of the shales and limestones 

 with the newer stratified formations, are some of them natural, others 

 faulted, 



( 125 ) 



