5 8 Sedimentary Formations 
for ages is apparent, as in one part of the coast north of Wollon 
gong there is an accumulation of -water-worn pumice, some dis¬ 
tance from the shore and beyond the reach of the present waves. 
It is supposed to come in during easterly gales, from the volcanic 
islands to the north-east. In 184*1 this fact, and all the evidence 
then collected in relation to such drift and “atmospheric deposits 
of dust and ashes,” were published in a paper I forwarded to the 
Tasmanian Journal , of which D’Arehiac (Prog, de la Goal.) was 
pleased to say it contained all that was known on the subject. 
Subsequently received facts have only continued what was then 
stated. 
Along the coast of New South Wales are found ranges of 
Dunes, with a variety of shells, some of them rare, others common, 
as on Port Hacking and Cronulla Beach; along the shores of 
Botanv Bay ; on the great flat between the Hunter and Port 
Stephens, and along the Macleay Eiver, which now passes for 
many miles through the shelly accumulations ; and about Moreton 
Bay and in more northern coast openings, shells and marine 
refuse form deep deposits, from which, as in Hlawarra and Broken 
Bay, a considerable profit is obtained by dredgers and shell- 
collectors, for the production of lime. 
Baised beaches also occur at various heights on rocky projec¬ 
tions of the coast, indicating elevation of the land, of which there 
is distinct evidence in the recent period, not only in Moreton 
Bn v, but near Sydney and thence to Bass’s Strait; also on both sides 
of that Strait, and as far as Adelaide and King George’s Sound. 
Mr. Selwyn gives data for assuming the elevation of the land to 
have reached occasionally 4,000 feet in Victoria, but he has no 
evidence of Tertiary marine fossils above GOO feet. Unfor¬ 
tunately, on the eastern coast, having no marine Tertiaries, we 
have to"found our deductions, as respects New South Wales, on 
less secure data. Yet we have here evidence of another kind 
and pot-holed surfaces of considerable extent have been found by 
me at various heights from 300 to nearly 3,000 feet. 
In a brief Memoir like the present it is impossible to quote all 
the authorities, nor has time allowed a more satisfactory digest or 
a wider range of statements. What has been thus collected is 
brought together in the design of giving a concise summary of 
the general Geology of the Colony, omitting, on account of its 
perplexity, all specific reference to the igneous rocks traversing, 
covering, "transmuting, or supporting the Sedimentary deposits. 
In this Edition many new facts have been introduced with the 
view of bringing on the .discoveries that have been made from 
time to time to the present period, when a new systom of 
geological inquiry has been just instituted in this Colony. 
If private independent travel and research have not been able 
to accomplish more than this abstract discloses, it may 
