Rydal. 
335 
show this unique and valuable cabinet to visiting 
geologists. 
The cuttings on the great Zig Zig show Hawkes- 
bury Sandstone on the top of the mountain, the choco- 
late shales lower down, and Permo-Carboniferous clay- 
stones below these again. Some of the shales about 
Lithgow are particularly rich in fossil plants, Phyllo - 
theca and Glossopteris in particular. 
Further west the Coal Measures give place to 
Devonian sandstones, which can be studied by walking 
from Rydal Railway Station to the top of Mount 
Lambie. Fossils — Spirifer disjuncta and lihyncho- 
nella pleurodon — are abundant in a sandstone at 
Ferntree Gully. Near Tarana wo enter granite 
country, which continues to Newbridge, beyond 
Bathurst. A few hundred yards on the Bathurst side 
of Newbridge platform, a good section of the junction 
of Silurian slate and granite is exposed in a railway 
cutting. Nearer to Bathurst a basaltic capping covers 
the Bald Hills, from Perth to Mount Stewart. 
Columnar basalt occurs also in some quarries at the 
racecourse, Orange. 
The examples of spheroidal weathering of 
granite figured on page 254 can be seen in the 
distance from the railway train just beyond Tarana, 
to the left of the line as one travels from Sydney. 
The following are places of geological interest in 
these districts : — 
1. A good section through Devonian sandstones 
and claystones in a cutting near Rydal. 
