THE HAWKESBURY SANDSTONE. 97 
were formed in “a large arid or desert region.” And it is not 
improbable that the Cretaceous sea spoken of extended to Western 
Australia. 
Grey 
dently formed the eastern and part of the southern margin of the 
_ Cretaceous sea. 
Conclusions 12 and 13 T need not now refer to. No. 14 states 
g that “there is no evidence of ice action, and all the physical 
2 fea are against such a supposition.” Now, the mode 0 
_ Seurrence of the angular boulders of shale, which I described in 
paper which I had the honor of reading before the Society last 
Year, I can only attribute to the action of ice. I do not see that 
_ the physical features of the period when the Hawkesbury rocks 
_ Were deposited may have been against this supposition ; on the 
ent , [think they may have favoured it, for on the western’ 
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| frequently enclose angular boulders of all sizes up to 20 
or more in diameter. These boulders have been torn up from 
Underlying beds of shale and embedded in a very confused 
manner in the sand and rounded pebbles brought by the trans- 
S currents. The angular form and mode of occurrence of 
