52 
H. T. FERRAR. 
a pipe of dolerite about, 100 feet in diameter, which rises vertically through the 
sandstone, but cannot be traced to a junction with any of the overlying sheets of 
dolerite. 
The Kukri Hills (Fig. 27). 
The bluff D forms the western extremity of the Kukri Hills and, as already stated, 
consists mainly of dolerite. If reference be made to the section along the Kukri Hills 
(Section III, Plate VII) it will be seen that two parallel sheets of dolerite, each 
Fig. 26. — Columnar! Dolerite at the foot of Knob Head. The large boulder on the sky-line is of Granite. 
about 2000 feet thick, run together at D. These sheets dip to the westward, and 
a specimen (704) obtained shows that the dolerite becomes finer in texture at its 
junction with the granite. The specimen was got from just above the lower junction 
and below D 2 . The junction here is most striking and extends in an absolutely 
straight line for a distance of 10 miles along the side of the East Fork. 
From the regular alternations of yellow and dark-coloured rock, I was at first 
inclined to suppose that there are two sandstone-deposits, but further work proved 
that the intrusive sheets cannot be continuous over the whole area. It would, 
however, be interesting to know what structural weaknesses have induced the 
