44 
The Queensland Naturalist June 1947 
the sediments. The sediments were only infrequently 
hardened by these intrusions; sometimes sandstone is 
seen to be hardened to quartzite, the heat having fused 
the edges of the grains of silica sand. Some of the sand- 
stones are calcareous. But the whole series seems to have 
been laid down on the old continental surface, rather 
than under the sea, for in shales just below the first sill 
of felspar porphyry met with on the road, were plant 
fossils — a fern, Cludophlebis australis , and a conifer 
Elatoeladus planus. These prove the Mesozoic age and 
the fresh-water nature of the sediments. But we cm not 
tell from them to which of the sediments of the Ipswich 
district they are equivalent — whether to the Ipswich 
shales, the Bundamba sandstone or the Walloon Series. 
So it would seem that, to allow these sediments to be 
deposited on land, this part of Queens]; nd arose from the 
ocean after the deposition of the Kin Kin sediments; 
possibly at the time of the earth movement which folded 
the Kin Kin Series and changed them into phyllites. 
This sedimentary series, with its intruding acid sheets, 
continues nearly to Tcwantin, where it disapperrs under 
the Recent coastal plains round Lake Do. nella. 
Sediments which, although they contain only woody 
stems as fossils, are similarly regarded as Mesozoic, come 
up again from under the coastal flat at Xoosa and f rm 
the greater part of the high land there. These are par- 
ticularly well seen in the walk around the headlands 
from Noosa, and are sandstones end shales which have 
been hardened and are now quartzites and indurated 
shales. At first they dip towards Noosa, but further east, 
the strata forming the main mass of the Ncosa high land 
dip, outward in all directions from a centre in Granite 
Bay, These sediments show good rectangular jointing 
and current bedding, and are bluish grey in colour. They 
are of t f n intruded along joint planes by sheets of horn- 
blende porphvrite. In the middle western part of Granite 
Bay, the sediments are intruded by a mushroom-shaped 
mass of quartz diorite (“granite"), considered by Dr. 
•Jensen to be a laceolite, causing the outward dips of the 
strata above it ; it contains fragments of partially 
digested sediments. It was probably this “granite” which, 
with its great heat, when it was intruded in the molten 
condition, fused the edges of the quartz grains in the 
sandstones, and thus formed the quartzites of Noosa. dust 
