88 THE HAWKESBURY SANDSTONE. 
8. The is Sate cliffs of the Blue Mountains are the han 
central cores of sandhills, wie loose portions of which have - a 
easily blown or pucinee aw 
9. That in all respects nf Selif chi is like many desert forma: } 
tions of the interior. ‘ 
10. That a large arid or desert region has existed in : 
in mesozoic times, while to the north and north-west there was a 
cretaceous sea. 
11. That this desert was terminated by the outpouring of wa 3 
quantities of volcanic rock, which altered the drainage and c; 
probably changed the climate. 
2. We have no means of knowing the eastern pie of this 
ancient desert, as there has been subsidence on that | 
13. This formation differs but slightly from whe and more 
extensive aerial ones in other countries, especially in Mexico, 
China, Arabia, &c. : 
14, There is no evidence of ice-action, and all the physica 
features are against such a supposition. 
APPENDIX. 
The ett illustration of an eolian rock in the oft-cited cae 
of Bermuda will be interesting :— 
~SaeSN reeat) a yn Fe: Eg Sis ie erg ge 
- Moseley, M.A., F. R. S.; page 18. 
The celia are almost entirely compose Jaces i 
fand, more or less consolidated into hard rock. In aa a 
; ho : 
is prevented by the growth upon them of several | bind 
amongst which a hard prickly grass (Cenchrus), wi fh 
meat root-fibres, is the most efficient, assisted by 
have obginsted from the. cutting through of some 8B 
hills for milite “e Seine roug i 
The sand is entirely calcareous, and dazzling white e 
exal closely, in small quantities 
consist of various sized particl cles of broken shells. 
wit 
