506 NEW SOUTH WALES. 
Course. | Width. 
18 WN. W 20 inches. Same cliff; very irregularly faulted. 
19 W. 6 feet. Rocky cove, three miles south of Kiama ; fol- 
lows the whole western side of the cove, and runs 
into its southeastern corner, 
20 W. by N. | 2 feet. Extremity of Black Head. On the other side 
of the Point, the same dike runs W. $ N. 
21 NE: 5 feet. South side of Black Head. 
In addition to the above we may state that on the ascent of the Illa- 
warra range near Mount Keerah, the high peak west of Wollongong, 
I observed a few fragments of basalt on the surface towards the top, 
showing that a dike probably intersects the sandstone in that vicinity, 
though concealed by the soil. On the Illawarra range, where the 
summit was first reached on the way to the Kangaroo Grounds, nume- 
rous blocks of basalt afforded the same evidence of a dike, probably 
several feet in width. We were compelled to hasten on without a 
thorough exploration. In the same range, just to the south of Brough- 
ton’s Head, the summit was found to consist wholly of basalt. 
In other portions of New South Wales, but few dikes were met 
with. The island of Nobby (page 511) is divided vertically by one, 
eight feet wide, which runs northeast, coinciding in direction with 
the fissures in the rock adjoining. Another dike intersects the rocks 
of the shores just south of Telegraph Hill, Newcastle; its width is 
three feet and direction north-northwest. 
At Paramatta, in the bed of the river, a narrow dike runs to the 
northeast, and has a slight inclination to the west-southwest. 
The flexures, curvatures and faults in many of the dikes are unusu- 
ally numerous. Sometimes a dike contracts rather abruptly till it 
closes, and then its continuation appears some distance to the right or 
left, beginning with a mere line where the other part commenced to 
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contract, and attaining its full width where that disappeared. The 
dikes 2, 10 and 18, exemplify this fact. In the first of these, which is 
here represented, the two parts are five feet distant. 
