IX 
system, as its fall is in an exactly opposite direction to that of the 
existing creeks, and having been long since silted up, it now actually 
forms part of a spur dividing the watersheds of some small tribu- 
taries of the present Vegetable Creek. 
The considerable alteration, therefore, which the physical 
features of the locality have undergone since the extinction of the 
channel in Avhieh the Insect remains were buried justifies the date 
of ibis deposit being referred provisionally to some part of the 
Tertiary Era, perhaps to its earlier period, as the authors suggest. 
I have the honour to be, 
Sir, 
Your obedient servant, 
T. W. EDGEWORTH DAVID, B.A., 
Acting Geological Survejmr-in-Charge. 
llARiiiE Wood, Esq., J.E., 
Under Secretary for Mines. 
11« 319-00 
