THE HAWKESBURY SANDSTONE, 61 
heavier winds. I noticed here how the wind formed the lamine. 
pin the deposition, and the length 
se 
. 
Strong breezes caused a steep 
of the lamin depended upon them, so that these lamine ri 
and fall according to the velocity of the breeze somewhat in the 
manner of a wind-sail used for pumps. Other facts brought to 
light by this small eolian sand-hill I shall refer to by-and-by. I 
fully ascertained before leaving the spot that the hill had been 
formed by the wind, and not by the overflow of the river. In 
fact it was a moving sandhill, and had shifted its position con- 
siderably in the interval of short visits, during which there had 
been no flood in the river, Beds of river-borne sand have quite a 
14 or 16 feet thick; ona closer inspec: 
stratification is discernible, In addition to 
