242 
Geology of Sydney. 
kerosene shale, and coal, can be noted in the Permo- 
Carboniferous. Garnet-rock, limestone, and numerous 
varieties of limonite and haematite can be noted in 
a few square miles of country on the Cox River, a 
few miles to the south of Hartley. An interesting- 
dark and fine-grained plagioclase rock, in the shape of 
a dyke, will be found in a creek at the back of the 
Fxo. 69. — View (looking south) showing a series of bedded Silurian 
limestones dipping to the west. Molong, New South Wales. 
Royal Hotel, Hartley. The dark colour of the dyke 
makes it noticeable beside the light-coloured granite. 
On the hill, just beyond Louther Public School, 
specimens of a very fine diorite can be collected. 
When sliced for the microscope, this makes a magnifi- 
cent rock-section in polarised light. Not far beyond the 
Half-way House belonging to the Grand Hotel, a few 
quarries have been opened, near two small churches. 
