53 
Cot a pecan 
‘'The Hawkesbury Sandstone. 
By the Rev. J. E. Tentson-Woons, F.G.S., F.LS., &e., &e. 
[Read before the Royal Society of N.S. W., 10 May, 1882.] 
THE Hawkesbury sandstone is that peculiar formation which 
constitutes much of the Blue Mountains west of Sydney, and which 
is also so conspicuous in Sydney Harbour, at the heads and on the 
banks of the Hawkesbury River. Its name was given by the late 
“ Hawkesbury Rocks.—Over the wu efmon workable coal 
which, and associated old deposits, they must in part have been 
shall On the summit of the Blue Mountains and along the 
& River the thickness of the series is very much greater than 
Near the sea. Patches of very small area contain bits of coal, 
hoe veins with specular iron, hematite, ilmenite, graphite, and 
ces, a8 
‘thea 
North ater, and a smaller patch on the coast, a few miles 
“ ey, and other similar patches in intermediate locali- 
< Bi 7 . ted . 
are in part associa with , 
| the joints of the sandstones close at hand with 
