98 THE HAWKESBURY SANDSTONE. 
opinion that the underlying shales have been broken 
“ eround-ice.” In December, 1879, I contributed a paper 
subject to the Royal Society of New South Wales, and 
W. J. Stephens, , communicated to the Linnean 
New South Wales the results of similar observations’ 
himself of the Hawkesbury rocks in the Upper Nepean 
your consideration only the following remarks. 
Mr. Tenison- Woods states that ‘we are not acquainted 
any existing sea-bottom utterly destitute of marine animal . 
authority for the occurrence of vast beds of an argue” 
which are perfectly destitute of any vestige of life or org 
are now in process of deposition over large areas | 
profundity. Moreover, whatever our present seas might * 
we must not forget that there are many ancient marine 100” 
not mi 
