Sec. 13.] detailed deschiptions. 183 



Contrary to the general rule in the ease of the trap hills, the ridges 

 Unusnai form of some ^^^^^ ^^^^ ^^ ^oorun Mul are rarely flat topped, 

 of the trap hills. ^^^ frequently extremely craggy. The range on 



the borders of Khandeish is remarkable in this respect. As a rule, the beds 

 dip very slightly, more so however than they do in Malwa or the Deccan. 

 The traps of Toorun Mul itself are nearly horizontal. To the north- 

 west there is a low east-north-east dip, and 

 Dip of traps. . ,i ,i , i- 



this, turnmg to north-north-east, contmues as 



far as the Oodai river, where the dip is about 6°. These dips frequently 

 can only be seen from a distance upon the hill sides ; consequently it 

 is difficult to ascertain their exact direction. Local dips in nullas, 

 &c., are not trustworthy as a rule, the surfaces of the lava flows being 

 very irregular. The traps of the hills along the northern boundary of 

 Khandeish have generally alow northerly dip, but it is not very regular. 

 But few trap dykes occur in Akranee when compared with the coun- 

 try to the west. Around Durgam, however, there 

 are several parallel dykes of small size. Near that 

 village they occur every 300 or 300 yards. They strike east-15° — 30°- 

 north, as in Eajpeepla. Some of these dykes are highly crystalline, 

 composed of felspar and granular greenish augite. South of Durgam, 

 where these dykes intersect certain flows of basaltic trap, there is, close 

 to the junction, a great development of the flat tabular crystals of 

 glassy felspar which characterize the porphyritic variety of the basalt. 

 The matrix is a dark grey rock, in which the augitic and felspathic 

 elements are readily distinguished beneath a lens. It is amygdaloidal, 

 containing nodules of carbonate of lime. 



In the Nerbudda just east of the mouth of the Oodai, a large 



trap dyke running east-10°-north crosses the river. It contains frag- 



Metamorphic fragments ^^nts of quartz and of granitic rock, partly fused 



'^^ *^"^P- into the trap. Other similar dykes occur in the 



neighbourhood. Masses of metamorphic rocks not unfrequently occur on 



( 345 ) 



