THE HAWKESBURY SANDSTONE. 111 
¢ 
a. 
F “the parallelism of the main lines of stratification is a prevailing 
_ feature in the Hawkesbury formation, and this alone is evidence 
equally convincing. ‘You cannot but be struck,” says 
Wilkinson, “with the undulating and hilly character of these 
any one look down into the valley from Piddington’s Hill and 
see whether the whole contour of the ridges and ranges are not 
strongly suggestive of aerial sandhills). Why, what could be more 
undulating than the gorges and gullies of the whole mountain 
just 
they have not been upheaved by the sea. Now, though horizon- 
‘Sea-level. Now, a fall of 3 feet in a mile is utterly inappreciable 
Ma section, but can readily be traced over long distances. — But 
here, at less than 50 miles from the sea, can we trace any tilting 
Nelination, though the beds must have been raised at the very 
least some 4,000 or 5,000 feet? Observe, also, that it is not a 
question of the Blue Mountains merely. The same formation, or 
_ *Yery similar one, is found scattered over the whole continent. 
a But hether we find it far away to the westward, on the summits 
_ “F mountains, or on the east side of the divide and close to the 
_ #4, it is always the same, with no tilting or inclination, but just 
_ $Sit was deposited in its peculiar undulating layers and laminated 
: false-bedding, When we add to this that the structure is that of 
2 <aptcaehig rocks the argument is very convincing. To say that 
