off 
? 
‘ i 
left unfilled had their steeply sloping flanks 
a6 THE HAWKESBURY SANDSTONE, 
deepest gorges the horizontal beds on each side correspond in such 
a way as to make one believe they were once continuous. The difli- 
culty is best expressed by the eminent Charles Darwin who, in the 
“Naturalist’s Voyage,” thus tells us how his visit to these moun- 
tains had puzzled him :— 
Darwin's views.—“ The first impression on seeing the corre- 
spondence of the horizontal strata on each side of the valleys and 
great amphitheatrical impressions is that they have been hollowed 
out by the action of water, but when one reflects on the enormous 
amount of stone which on this view must have been removed 
through mere gorges or chasms, one is led to ask whether these 
oe 
remarked near the Weatherboard, fall into the head of these al 
through which the whole of the vast amount of triturated eer 
‘must have been carried away? The’ only light I preter 
upon this enigma is by remarking that banks of the most ap the 
Se eT ee ee eee ee es ee 
_ forms appear to be now forming in some seas, as in 
West Indies and the Red Sea, and that their sides are exe 
steep. Such banks, I have been led to suppose, 
1eet, heaps it round submarine rocks and islands, it ish 
possible to doubt after examining the charts of the West Ind 
sea on an irregula 
worn 
‘during a slow elevation of the land, the worn-dow? 
