60 THE HAWKESBURY SANDSTONE. 
light brush (Melaleuca genistifolia ?). The cliffs of sand are quite 
recipitous on the seaward side, and are from 100 to 200 feet 
high. On a close examination the cliffs present exactly the 
appearance of the Hawkesbury sandstone except in colour, and 
they are not consolidated. There are the same undulating “layers” 
of varying thickness, forming thick sinuous marks upon the i 
which can be seen at a great distance. The layers are entirely 
constructed of lamin of sand with false bedding, which dips at 
every angle not outside 30°. The layers are of different colour, 
and they seem to preserve this colour throughout, giving the ¢ 
a curious ribbon-like structure. Some are white, others yellow, 
and some ochreous red. The formation is entirely one of blown 
height. In places there are sand-slips on some’ of the dunes where e 
the false bedding becomes revealed. The undulating lines which 
shells intermin, They represent the former of 
ing sand, where its shifting has been stayed by the growth 
a dense brush us it has remained stationary for years, until @ 
the surface again and overwhelmed it. In part of the brush there 
are swamps of water, at least so I was informed, but I had not 
time to examine them. 
Burdekin River.—Before I point out the application, of such 
formations to explain the Hawkesbury sandstone, it 18 better 
pechspe to give one or two more illustrations. In ¢ wail: 
Burdekin River in 1879, at a place close beside the present ! it 
way, I noticed a hill of loose drift-sand, not far from the bed 0 
the river. It would not have attracted my attention had 26 Dt 
been for the large quantities of loose sandy soil that J foun 
— parts of the banks of the Burdekin. There was 2° d 
river, which is of a very sandy bottom, and so I supposed ie 
all the other sand was derived in the same manner. My I 
sandhill remained unexamined then, but two years ciedh 
came by the same spot and found that it had been large 
y 
every angle from horizontal to about 23°, but also 
direction according to the wind. Another very } ce 
important fact met me here. There were large flat oF * 
