332 
Geology of Sydney. 
Perhaps, however, the grandest view on the Mountains, 
though not the most beautiful, is obtained from 
Perry's Look Down, five miles from Blackheath on the 
Hat Hill Road. Here you gaze into the deepest part 
of the Grose Valley, with Mount King George opposite 
rising vertically in one sheer ascent of two thousand 
feet or more, from the gorge below to the basalt- 
capped crown above. 
The Jenolan Caves can be visited from Mount 
Victoria, and good sections of the Haweksbury 
Sandstones, Narrabeen Shales, Upper Coal Measures, 
and Silurian slates and claystones can be seen en 
route. 
1. Within easy distance of Mount Victoria the 
student may examine : — 
L The lenticular clay shale beds of Mount Pid- 
dington, containing Thinnf eldia. 
2. Well developed sections in the various deep 
gulleys around, showing Hawkesbury Sand- 
stone, Narrabeen Shale, and several coal 
seams varying in thickness. 
3. Kerosene shale beds at Sugarloaf, Grose 
Valley, Hartley Vale, with their accompany- 
ing fossils, Glossopteris , Brachyphylluw , 
masses of charcoal, etc. 
4. Rainprints and ripple marks in sandstone at 
Fairy Dell. 
5. Ferruginous drips coating ferns, etc., at Ross 
Cave Gulley. 
6. Marine fossils at Ronnie Blink, near Little 
