ILLAWARRA COAL REGION. 479 
may be obtained. Farther south, commences the Wollongong rock, 
which appertains to our ¢herd division, or sandstone below the coal, 
and the coal formation retreats inward, continuing along the base of 
the Illawarra range, as shown on the map of the district. 
On the road running west from Wollongong, the following alterna- 
tions were observed, commencing above. 
20 feet.—Argillaceous shale, greenish, containing numerous impressions of Glossopteris ; 
alternates with a light gray arenaceous schist. 
1 foot.—Black coaly shale, more or less argillaceous. 
3 feet.—Clay, imperfectly schistose ; crumbling. 
1 foot.—Argillaceous shale, greenish. 
2 feet.—Clay, as above. 
13 feet.—Argillaceous shale. 
3 feet.—Black coaly shale. 
4 feet.—Clay, as above; crumbling; passing into argillaceous shale below. 
3 feet.—Coal, with layers of clay four to eighteen inches thick. 
A feet.—Dirt-brown argillaceous shale. 
10 inches.—Coaly shale, black with thin layers of coal. 
23 feet.—Argillaceous shale, a little arenaceous. 
2 feet.—Poor coal; argillaceous above and interlaminated with clay layers six inches 
thick. 
5 feet.—Gray sandstone, having a concentric structure, 
+ foot.—Blue argillaceous shale. 
2 foot—Clay as above. 
1 foot.—Grayish-green clay shale, soft above. 
23 feet.—Blue shale. 
1 foot.—Blue shale and impure coal. 
1 foot.—Hard argillaceous shale, somewhat arenaceous, 
3 feet.—Dark green argillaceous shale, 
4 feet.—Dirt-brown argillaceous sandstone ; schistose, 
12 feet.—Grayish-white argillaceous shale. 
6 feet.—Grayish sandstone. 
20 feet.—Shale and sandstone, containing vegetable impressions, trunks and branches of 
trees. 
The layers dip to the westward under the mountain at an angle of 
six degrees, diminishing below to three degrees. ‘The road has a 
slight ascent, and the different layers come successively in view. 
To the south of this locality, the coal has been observed at several 
places, through Keelhogue, Depto, &c., as far as the latitude of Red 
Head, where the mountain, as seen on the map of Illawarra, makes 
towards the shore. Beyond this, farther south, the mountain again 
diverges from the sea, but no coal had been detected in this part 
