Basalt. 
261 
10. At Blakehurst, near Hurstville. 
11. Near Cremorne, North Shore. 
12. At a point, on a tributary of the Lane Cove 
River, about three miles from Pymble. 
13. A decomposed dyke was exposed (while some 
excavations were being made by the W ater 
and Sewerage authorities) in Riley-street, 
south side of Albion-street, Surry Hills. 
The dyke was parallel to the north wall of 
house No. 292. 
14. Another dyke was exposed at the corner of 
Waterloo and Cooper Streets, Sydney. 
15. At the end of the old Rifle Range, Moore 
Park — dyke runs east and west. 1 
Hardened and prismatic sandstones are known — 
1. At Blakehurst, near Hurstville. 
2. At La Perouse, in a quarry close to the main 
road. 
3. At Pyrmont, near Saunders’ quarries. 
4. At Five Dock, in the quarry worked for 
road- making. 
5. On the cliffs, a little to the south of Manly 
Beach. 
G. At Bondi, associated with basalt. 
7. About two miles south of Turramurra. 
8. In a quarry on the road from Hunter’s Hil] 
to Ryde, near the first-named locality. 
An illustration showing the relation of hardened 
and prismatised sandstone to igneous intrusions was 
1. See page 339. 
