BASALTIC DIKES. 505 
farther examination of the surrounding region. No other traces of 
basaltic conglomerate were observed in that region. 
Courses of Basaltic Dikes—The dikes of Illawarra are numerous 
and present interesting peculiarities. Their courses and characters are 
various, as shown in the following table. 
Course.: Width. 
1 N. E. 40 feet. On Point Towrudgi, two miles and a_ half 
north of Wollongong. Disappears on one side in 
the sea, and on the other under the beach. 
N.E.byN.| 38 feet. Rocky shores just north of Wollongong beach. 
The dike is interrupted for a short interval, and 
oo 
the adjacent parts run nearly parallel for some 
distance (fig. 1, p. 506). 
3 N. by E. 6 feet. Two miles west of Wollongong on the road 
running south. Only seen on the north side of 
the road; it disappears under the soil. 
4 N. W. On the same road as last, north of Illawarra 
Lake. 
5 W.N. W 6 feet. North extremity of second cliff north of Kiama, 
6 WVcoNE WV 4 feet. Same locality. 
ii W. by S Same cliff farther to the southward. The dike 
has been removed by the sea for one hundred 
yards or more, and leaves a deep narrow channel 
entered below by the sea, 
8 W.byS Same cliff; similar to the last. 
9 W..by 8. | 6 inches. Same cliff farther to the southward; forms one 
side of a deep cavern excavated in the cliff. 
10 IN. Ne E, Same cliff; cuts through the sandstone that 
forms the base of the cliff, but does not intersect 
the basalt above. 
11 NW, 40 feet. Same cliff. There is a broad fissure cutting 
through the rocks of the shore, which is evidently 
a dike, though the rock is concealed by the soil. 
12 E. N. E. 5 feet. First cliff south of Kiama Point. 
13 N. E. 5 feet. Same cliff as last. 
14 E. by S. | 16 inches. Same cliff, near south end. 
15 WwW. NW. Kiama Point near Blow-hole, intersecting the 
basalt of the cliff. 
16 WN. W. At the Kiama Blow-hole, cutting through the 
rock over it, 
17 W. by N. | 40 feet. Second cliff south of Kiama; cuts through the 
basaltic conglomerate, and above forms a_ bed 
overlying it, 
127 
