I06 
The Queensland Naturalist. 
Nov., 1924: 
much smaller form than the avera^'C. Mr. Yonnjj a\so 
exhibited specimens of a liverwort (Marc-hantia) found 
^rowin^’ on burnt -over peat swamps on Stradbroke Island. 
Mr. L. Franzen exhibited s])ecimens of a moth parasitic on 
Platybraeliys leueosti^mia, Walk. Mr. D. Curtis exhibited 
(a) specimens of some beetles and (b) specimens of the 
Lycaenid Paralucia pyrodiscus, and recorded the fact 
that is was fairly counmon on the sides of Tambourine 
Mo untaiji. 
A letter by Mr. Dornbusch, of Warwick. suj>*^a‘stin^- 
the rhythmic basis of matter, was read by the acting’ 
Honorary JSecretary. 
0 
GEOLOGICAL NOTES TAKEN ON THE ENOGGERA 
EXCURSION. 
By Dr. E. 0. Marks. 
The Eno^’^-era reservoir is situated on. or very close 
to the western boundary of the Enn^^^-era "Tanite intrusion 
(crossed by the road from town). Opportunity was taken 
to traverse the country (Brisbane schists) lyin^^ between 
the Eno^'^era and the Samford ^’ranite areas. The road 
was taken which follows the divide between the head- 
waters of the Eno^o-era Creek and l^pper Kedron Brook, 
and leads up lu^'h ridfi'es ])ast McAfee's farm and the old 
Perseverence (h)ld Mine, until, from a considerable ele- 
A’ation. one suddenly looks down over the wide Hamford 
basin. 
The contrast in scenery liere is very striking'. 
It coincides witii tin* chaii^-e from S(*hist to <.*Taiiite. the 
boundary of which we met with at the foot of the moun- 
tain. near Camj) Mountain Quarry. In other jdaces, ^js 
shown by ])revions ohser\'at ion, the boundary is on the 
sides of the hills enclosing' the basin, 
Ther(i was little indication in the schists traversed 
of the ]>roximity of two lar^'e ^’ranite intrusions. 
No apophyses were observed (though these do occur) 
and the contact metamorphism is very slight. It is 
highly probable that the old lYrseverance and other 
mineral bodies in the vicinity owe their origin to the 
intrusions. 
At Mi'Afee's farm the usual poor soil of tlie schist 
country is replaced by a richer soil, due to the fact that 
the schist here is an altered basic rock, similar to that a 
little further on, on which the Mountain Camp banana 
farms are situated. 
