: \ 
THE HAWKESBURY SANDSTONE. 65 
minute quartz crystals whose facets stud the surface of the stone. 
he ferruginous stains on the roc the bands of ironstone 
will also show that another kind of metamorphism has been going 
on. Water percolating through the stone has affected the felspar 
luens of stone from this formation taken from widely separated 
aauties, I am of opinion that it has originally been formed of 
traded grains of sand, or of fine dust, such as we might expect 
c 
ny cannot be from marine action, as the sands collected by me 
ofr places, and derived from such rocks as granite, were not 
all abraded, though they had evidently been long exposed to the 
scion of the surf. Sands derived from the weathering of the same 
and n in other places, such as Mount Victoria, Lapstone Hill, 
sang Second Zigzag, were not all abraded ; but the grains were 
se; with large crystals of quartz in the midst ; in fact some 
