260 
Geology of Sydney. 
Good examples of dykes of decomposed basalt are 
known to occur — 
1 . Near Beecroft Railway Station, crossing the line 
2. Crossing the railway line at Petersham. 
3. Crossing the line at Belmore Railway Station. 
Fig. 73. — Columnar Sandstone, Bondi, 
4. At Saunders’ quarries, Pyrmont, running 
east and west. 
5. In the quarry at Five Dock tram terminus. 
6. In a quarry near Kensington. 
7. Cutting through the Greenwich peninsula. 
8. At Bondi. (See Map). 
9. Small dykes at Long Bay and Maroubra Bay, 
running into the sea. 
