June 30, 1908. The Queensland Naturalist. 
51 
S )iue of tliein show that since “ grounding ” they have 
had their exposed upper surface battered into rounded 
forms and incipient j^otholes by the passage of smaller 
stones over them. I can imagine no agent save floating 
ice transporting such heavy masses. (See my notes in last 
number). 
We also examined the remains of the olivine basalt 
(late Tertiary), which once covered a great portion of the 
Brisbane Tertiaries. It is almost destroyed, and has 
weathered into a clayey magnesite, wdiite and greenish, 
but in places the old spheroidal structure can be made out 
and the vesicular character of the original rock. 
1 find the Tertiaries much more continuous and widely 
spread than I at first thought likely. They seem not to 
be more than, say, sixty feet thick. The provisional 
arrangement of the beds is as under 
Table of Strata. 
Recent. 
Alluvium of Brisbane R., etc., in three Terraces. 
Tertiary. 
(A. Neogene). 
Basalt, olivine ; much decomposed into Magnesite, 
etc. 
B. 
X' 
H - 
z 
cc 
Pi 
Eogene. 
1. Mottled red and grey Marls and Brickearth ; 
2. Fine White sand, with carbonaceous markings ; 
3. Plant Beds, fine-grained whitish marly sands, 
often very finely laminated ; 
4. Sandstones, not very compact ; hardening on 
exposure ; passing into grits ; 
5. Sherwood Skerry Scree. ; 
6. Higeldy Gravels, with Erratics, becoming almost 
conglomerate on exposure. Not water-sorted. 
Mesozoic. 
Ij>swich Beds. Pale shales with Tscniopteris, 
etc. Massive sandstones, grits and 
conglomerates, with beds of volcanic 
agglomerate near and at the base. 
Palabozic. 
Gympie Beds. Schists and Quartzites. 
The Brisbane Tertiaries lie unconformably upon the 
older rocks, overlapping from the Gympie across the Ipswich 
from its base to quite high up in the series. 
