THE HAWKESBURY SANDSTONE. 105 
unbroken line of igneous eruptions which marks the whole course 
_ ofthe dividing range, from the ridge between Cassilis and the 
Talbragar, itself volcanic, down to the culminating points of the 
Blue Mountain Range. The summits between the Cudgegong and 
i 
s 
“ 
oe 
It is like the handle of a frying-pan, when the -pan itself 
represents the Hawkesbury basin, and, until I had the pleasure of 
hearing Mr. Tenison- Woods’ paper, appeared to me quite inexplica- 
ble. Now, on the contrary, it appears the most natural thing in the 
Grant that a sand-drift existed from the westward, blow- 
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&, 
oo 
Mr. Tenison-Woods’ argument, I may refer to 
alley 
nes 
erous date, which 
i fel- 
/; one, as I should term it ; but large hollows in the orig valley 
ve been filled by a fine white quicksand, evidently of eolian forma- 
ton, in which water is abundant, as for example, at Killarney 
