54 
The Queensland Naturalist September, 1939 
the river runs through the Petrie Series and becomes very 
slow. The tide limit extends into the Greenstones area, but 
affects the vegetation only in the flat Petrie Series area. 
One Mile Creek and Sidling Creek are much smaller 
streams, often little more than a chain of waterholes during 
the dry season. Alluvial flats of small extent occur along 
Sidling Creek; the flood banks are lower, and the second 
terrace is therefore more affected by the presence of the 
stream. The One Mile Creek flows for the most part 
through the Petrie Series. Its flood banks are low but 
steep, and there is usually a stretch of shingle between 
them and the water’s edge. 
VEGETATION— GENERAL CHARACTERS. 
Originally the greater part of the area was covered by 
open forest composed chiefly of Eucalyptus spp. Angophora 
subvelutina was scattered among the Eucalypts on the 
schists, its place being taken by the allied Angophora 
costata on the Petrie Series. In the damper depressions 
Tristania suaveolens was common, and in still lower and 
damper regions in the Petrie Series area Melaleuca viridi - 
flora formed nearly pure communities. In the Petries also 
Acacia Cunninghamii and Casuarina torulosa were fre- 
quently sub-dominants, but were rarer on the schists. A 
sparse undergrowth of shrubs or small trees was probably 
present. This is now absent on the Greenstones. On the 
Phyllites it comprises such plants as Jacksonia scoparia , 
Daviesia ulicina var. angustif olia, Leucopogon juniperinus , 
Acrotriche aggregata and Lissanthe strigosa. On the 
Petries a similar suite appears in some places in the south- 
west. In the east and south-east the chief members are 
Jacksonia scoparia with Persoonia cormfolia. 
Along the banks and adjacent flats of the larger 
streams rain forest occurred. Swampy areas occur particu- 
larly in the east. They are rare on the schists. 
In the extreme east and south-east the North Pine 
River is bordered by mangrove swamps with salt meadow 
behind. In the western and south-western part very little 
of the original vegetation is now left. Almost all the rain 
forest has disappeared except for a. narrow fringe of trees 
on the stream banks and an occasional tree such as Red 
Cedar ( Cedrela australis) or Aphananthe philippinensis 
on the river flats. The open forest has been more or less 
completely cleared, giving parkland or grassland pseudo- 
climaxes. A small area on the Bunya Phyllites is least 
altered. 
