Byn2e C. F. LASERON. 
escape observation. The large boulders however seem to 
point to Devonian rocks at a high altitude in the locality. 
On ascending the mountain from the Yalwal Creek side, 
more large boulders of quartzite with veins of quartz were 
found in abundance, almost on the top of the range. They 
were of all sizes and littered the whole hillside. Again no 
outcrop was seen. The largest boulder was quite four feet 
across and must have weighed over half a ton or more. 
One or two were found near here embedded in Upper Marine 
sandstone. The majority were waterworn. Assuming 
these boulders to be embedded in a Permo-Carboniferous 
sandstone, the only force that could have brought them 
from any distance is floating ice. Water power certainly 
could not have moved them far. Several of the boulders 
were extracted, and the unweathered portion examined, 
but no ice striations could be detected. However, it does 
not necessarily follow that the absence of ice-striations 
excludes the possibility of the agency of ice, but the 
boulders being of the same character as the local quartzites 
and the presence in them of Devonian fossils, seems evidence 
that they have come from an actual outcrop in the near 
neighbourhood. 
The Upper Marine sandstones on top of the range were 
noticed for some distance to be dipping to the west, at an 
angle of 20°. For beds so high up in the series, this is 
remarkable, unless this inlier occurs immediately to the 
east, on the sloping sides of which the later beds were 
deposited. The rhyolites at Grassy Gully reach quite a 
high altitude, their junction with the sandstone being quite 
300 feet above river level. This means that high land 
existed here when the Permo-Carboniferous sea started to 
encroach, even if the inlier of Devonian sedimentary rocks 
does not exist. 
Permo-Carboniferous.—With the exception of a certain 
small series of sediments at Yalwal Creek, which are fresh- 
