THE HAWKESBURY SANDSTONE. 67 
7 ten protec in situ.. Numerous fine-grained sandstones, parti- 
those of Triassic age, are composed of quartz grains 
80 m canpltay rounded as under the microscope to phd water- 
ese grains are variously coloured red or brown 
boy hydrated oxides of iron ; in some cases, minute 
4 
2 
a considerable number of modern sands, none of them 
exept wich as had been long subjected to the wearing effects of 
_ Wind action, were found to resemble those of the “millet-seed” 
mes. Those which resembled them most were blown desert 
sands. In the discussion which ensued on this paper, Mr. Blandford 
said that some years ago he had examined the Indian desert, and 
found the grains of sand well rounded. They were mostly of 
4 
z 
i] 
a 
ath 
eB 
: 
4 
: 
= 
Es 
2 
a 
e 
come from the coast and the river Indus. He further stated that 
the sands appeared to be unstratified, and this I can confirm in the 
‘Sppearance of all desert sands, but ‘einai a section is made the 
Peculiar false bedding is immediately seen. Mr. Rutley on the 
__ ‘Sate occasion called attention to the presence of felspar on many 
- the ‘sandstones described, and suggested that it was quite possible 
for such sandstones to be changed into felstone. There was often 
much sa in distinguishing between the finer grained igneous 
and sedimenta poe 
of ane a gments of quartz having a ‘henna 
- Of less than a, of an rr nmnctinsled by the long con- 
ae action ot currents, or by the continuous action of breakers 
Yilbio y years; yet the rounded character of the fragments of a 
Po lown sandstone is often difficult of detection in a compact 
_ wea W “te undergone internal metamo 
® now come to the inquiry as to the causes of those peculiar 
i be in the eolian sandstones, such as the false bedding, 
ns layers, and the ironstone bands and concretions. 
= upon scan while ae oe moult 
