198 
This lower and more ancient horizon is also characterized by thicker 
seams of coal and generally by coal of better quality. 
In New South Wales the coal seams of Bulli on the south coast and 
Ashford near the Queensland border on the north are of great thickness, 
. and they occur associated with a glacial conglomerate and with a flora of 
which Glossopteris is a prominent feature. In South Africa the thick coal 
seams, so extensively worked at Vereeniging and elsewhere, occur also 
associated with the Dwyka conglomerate, which is of glacial origin; and 
there also Glossopteris is prominently represented in the fossil flora. So 
that in all these cases the coal seams belong to the Glossopteris horizon. 
Between the Toeniopteris coal seams.of the Stormberg and the Glossopteris 
coal seams of Vereeniging there are represented many thousands of feet of 
stratified beds, and the lapse of time between the two coal depositions must 
have been of vast duration. 
In Victoria, besides the Toeniopteris horizon, in which all the coal seams 
at present worked are found, there also exists at Bacchus Marsh a Glos¬ 
sopteris flora associated with a glacial conglomerate, and, considering the 
parallelism in so many respects between the horizons in Victoria and New 
South Wales and South Africa, there seems to be a possibility that in 
addition to the Toeniopteris coal seams already known and worked there 
may also be Glossopteris coal seams which have yet to be discovered and 
which may underlie the Jurassic rocks of the State. In boring operations 
these possibilities should not be lost sight of. 
[Report sent in 6.8.06 .] 
GEOLOGICAL BOUNDARIES IN THE WOORI YALLOCK 
BASIN. 
By /. Easton. 
The accompanying plan shows the boundaries traced out in the Woori 
Yallock basin. 
It will be noticed that the volcanic area to the north of the Monbulk 
settlement is separated from the main Dandenong mass by a narrow strip of 
Silurian and has no connecting neck as shown on the geological sketch 
map of Victoria. 
This area is practically confined to the Wan din-Yallock parish, and 
produces a dark chocolate coloured soil, with very little rock outcropping, 
except at points shown on plan. 
The greater part of this area consists of older basaltic rocks, but 
owing to the scaircity of rock exposures in the south-western portion, I 
cannot be sure that some of it may not be related to the dacites, for on 
the Olinda Creek, on the western boundary, I obtained a few boulders of 
dacite. 
Several wells have been, sunk in the vicinity of South Wandin, but 
I could not get any solid rock from the debris thrown out of them. The 
deepest well that I saw was in allot. 131, Wandin Yallock. I was informed 
that it is about 100 feet in depth ; the material from this well was used 
to make up a portion of the garden, and appeared to be very similar to 
the surface soil, being chocolate coloured, with a small quantity of lighter 
coloured material intermixed. 
Ironstone occurs in different parts of the area, as shown on plan. 
