Sept. 30, 1908. The Queensland Naturalist. 
59 
Appias ega — several, mostly took a pair. 
Delias argentliona and Delias nigrina — both plentiful ; did 
not bother to net any. 
Delias nysa — many about, but appeared worn ; captured 
one with sub-marginal spots of hind wings almost 
obsolete. 
No Papilios or Skippers w'ere seen, and the ubiquitous 
Acraea andromacha and Pyrameis kershawi were absent. 
Coming home up the River in the boat specimLens of D. 
argenthona, nigrina, and nysa were noted flying over, 
and an occasional lycaenid butter-fly, which could not be 
identified wuth certainty. 
THE OCCURRENCE OF DIATOMACEOUS ROCK IN 
SOUTH QUEENSLAND. 
By H. Tryon. 
The Diatomaceous Rock, exhibited on behalf of Mr. 
R. W. Lahey, came from the vicinity of Canungra Creek, 
S. Queensland. 
It may be described as a soil-stained, opaque mass, of 
a dull, pure white colour, of very fine clay-like structure, 
adhering to the tongue, readily scratched by the nail, and 
so light as to float in water. This was met with in masses 
outcropping on the side of a high hill. 
Witli regard to this exhibit, I have on several 
occasions seen specimens of this from the Logan District, 
and finding that it contained alumina, without special 
examination, regarded it as Cimolite, and, in fact, a 
small specimen apjiarently identical with it was so-labelled 
in the Museum of the Geological Survey. A block of it 
displayed at the same institution was labelled Tripolite. 
This, it was learned, was derived from a deposit occurring 
beneath basalt, and above the Ipswich sandstone at a 
spot near the rear of Nerang Creek, on the eastern side of 
Beach Range, a spur of the Macpherson Ranges. 
The label referred to also contained the following 
analysis of the specimen that had been made at the Gov- 
ernment Analyst’s Laboratory : — 
Tripolite from Beach Range, S. Queensland. 
Silica 
.. 86.0 
Iron — Fcg O3 ; Alumina, A2 O3 
. . 5.2 
Lime-Cao 
. . 0.5 
Water at 100 degrees C. . . 
.. 4.6 
Loss on Ignition 
.. 4.1 
100.4 
