NERBUDDA DISTRICT. 



227 



I shall conclude by mentioning one which may be traced for miles 

 along the upper Tawa Valley. Where it crosses the wide plain, its 

 course is marked by a range of little hills, which zig-zag curiously over 

 the low ground ; each one of these little hills is irregularly oblong in 

 shape, and seldom more than 100 yards long ; or more properly, breaks 

 occur in the continuity of the range at these short intervals, and at every 

 break a change in its direction occurs. The hillocks are not widely 

 separated, each rising almost from the foot of its neighbour, but two 

 consecutive hillocks are sometimes nearly at right angles to each other, 

 though generally only slightly oblique in direction. Standing on one of 

 the high hills which command an extensive view over the valley, this 

 dyke looks like a great chain-cable laid in a straight line on the ground, 

 but whose links, from its not being drawn tight, lie irregularly zig-zaged, 

 and do not individually keep parallel to the general direction of the 

 whole. 



Fig. 14, represents trap dykes seen near Hindia on the Nerbudda 

 and is typical of the habit of the intrusive rock when seen cutting 

 through jointed masses. 



Fig. 14. Trap dykes, near Hindia, on Nerbudda River. 



