34 
Geology of Sydney. 
The principles of this new cycle of change are very 
clearly summarized as follows by Dr. Molloy . 1 
It may be asked how the various strata of aqueous 
rocks which constitute the chief portion of the earth's 
crust have been lifted up above the level of the sea; 
for, according* to our theory, they were at first deposited 
under water. This is a question that must inevitably 
occur to the mind of every reader, and geologists are 
ready with an answer. They tell us that, from the 
Fig. 8 — Microscopic structure of Basalt, Bald Hills, Bathurst. 
earliest ages, the crust of the earth has been subject to 
disturbance and dislocation. At various times and in 
various places it was upheaved, and what had been 
before the bed of the ocean became dry land; again it 
sunk below its former level, and what had been before 
dry land became the bed of the ocean. Thus, in the 
former case, a new stratum which had been deposited 
1 “ Geology and Revelation,” p. IS- 
