, 
308 T. G. TAYLOR AND D. MAWSON. 
of the Nattai and its tributaries 
which have cut down through the 
sandstone to the Permo-Carbonifer- 
ous measures and exposed sills and 
laccolites of basalt and dolerite. 
Hight miles away the sharp cone 
of Mount Jellore stands out, a mass 
of trachyte with cones of basic rock 
near its southern slope. Ridges 
and cappings of basalt can be seen 
stretching from Mount Jellore west 
of the Gibto Berrima, but separated 
from the point of outlook by an 
Basalr Pig | 50 
* Week 
GIBRALTAR TRIC: STH: 
Fault 
(Lor legend see Plate 25.) 
” to wWlouuwt Jetlore. 
extensive area of elevated sand- He 
. 8 — 
stone hills. Towards the east Roh 
another series of basalt flows is 8 ; 
encountered, extending towards 
the Nepean. (See Plate 25.) 
Shales intrud 
Dotlerite 
TU gu MOUS 
ry Fe: 
we 
II. SEDIMENTARY FORMATIONS. 
1. Recent—(a) Alluvial deposits. 
(b) Chalybeate deposits. 
2. Tertiary—Ferruginous gravels 
and shales. 
3. Triassic—(a) Wianamatta 
Shales. 
(b) Hawkesbury Sandstone. 
4, Permo-Carboniferous—Shales 
sandstones, and coal meas- 
ures. 
Basalt 
| Terlta 
Shale jcometomt 
Wianamatta 
1. Recent Deposits. 
1. (a) Thealluvial deposits formed 
of débris washed down from the 
hills, occupy swampy flats around 
‘* Woodlands,’’ and _ necessarily 
Fig. 1—Section A—G (see Plate 25) through the Mittagoug district tu “Lhe Gib 
MT, JELLORE 
