236 T. W. E. DAVID AND G. H. HALLIGAN. 
and considers that “‘it is probably Myrtaceous or Legumin- 
ous, probably Hucalyptus.”’ 
From this report it is clear that the species of wood all 
belong to recent types. The evidence of the roots and 
other remains of plants, taken in conjunction with that of 
the estuarine shells, is in the opinion of the authors con- 
clusive proof that we have here a very definite piece of 
evidence of a recent subsidence of the coast line to the 
amount of about 50 feet. This subsidence, from the evid- 
ence quoted earlier in the paper, appears to have been 
somewhat widely extended, inasmuch as the area from Port 
Hacking to Port Stephens can certainly be included in the 
submerged area, that is a belt of coast about 90 miles in 
Jength. 
Tide gauge observations at Fort Denison are unfortu- 
nately, up to the present, not very reliable, but as far as 
the evidence goes it is insufficient to justify the statement 
that our coastline at the present moment is undergoing an 
appreciable depression or elevation. The evidence collected 
by Mr. H. S. W. Crummer, shows that at Vaucluse and — 
parts of Middle Harbour crusts of Cirripedia and Balanide 
are found there a few feet above the level of high water. 
It is possible that these indicate a slight upward joggle of 
the coastal plain. The evidence, however, cannot be 
implicitly relied upon in view of the fact that older con- 
ditions along the coast line, and the shape of the shore line, 
lead to the waves at times splashing up higher than at 
others. It is quite sufficient for the growth of Cirripedia 
and Balanidee that they shall be bathed by the waves at 
least every high tide. 
It is to be regretted that with the appliances available 
we were unable to carry the bore below the 70 feet level. | 
It is highly probable that further traces of submerged land 
or Swamp surfaces would have been met with at these 
