106 THE GLACIER EPOCH OF AUSTRALASIA. 
Bruni Island. Since that time I have obtained abundant 
evidence in rocks of the same age throughout South-eastern 
Tasmania. 
Everywhere these ice-borne conglomerates and erratics are 
found in more or less barren layers of the Jower marine beds, 
locally known as ‘‘Mudstone Rocks.’ In places, however, as at 
Beltana, near Hobart, Bedlam Walls, Blackman’s Bay Heads, 
Variety Bay, Adventure Bay, Esperance, and Haglehawk 
Neck, the dropped erratics and conglomerates are associated — 
in dense white or yellow, close-grained mudstones, with the. 
following organisms :— 
Spirifera Darwinii... os df Marrs. 
‘i Strzelecki ... ais de Kon. 
45 convoluta ... “ims Phillips. 
53 glaber sia one W. Martin. 
is tasmaniensis ave J. Morris. 
Terebraluta sacculus ....... J. de C. Sow. 
Sanguinolites Etheridgei ... de Kon. 
- undatus whe J. D. Dana. 
Pachydomus carinatus sa J. Moris. 
Edmondia ovalis ous ai R. M. Johnston. 
Aviculo-Pecten limeformis .., J. Morris. 
Tellinomya Etheridgei sae R. M. Johnston. 
Platyschisma occula ..., aes J. de C. Sow. 
Orthonata compressa ... aise J. Morris. 
Astartila cytherea... dam Dana. 
Theca lanceolata sep bee J. Morris. 
Goniatites micromphalus _... J. Morris. 
| Strictus ... ale Dana. 
Also, among other forms, a stray fragment bearing a clear 
peercenon of the well-known fern, Gangamopteris spathulata, 
‘Coy. 
The erratics generally are found in the middle or lower 
horizons, and are nowhere associated with the fine laminated 
zones almost wholly made up of the remains of the common 
lace-like Fenestelle. There can be, therefore, no possible 
doubt as to the age of the rocks in which the ice-borne’ 
conglomerates and erratics occur. 
For the most part the polished or angular pebbles, boulders, 
or angular blocks, occur singly, embedded in what must have: 
been, at the time of deposition, an exceedingly soft, fine 
homogeneous mud, showing in these beds scarce a trace’ 
of lamination. In some places, however, they occur in 
thin lenticular patches as an irregular conglomerate bed. 
The rocks are either polished or angular pebbles, or blocks. 
grading from small pebbles to blocks over a ton in weight, 
principally composed. of various. kinds. of granite, gneissy. 
quartzites, mica-schists, slates, quartz-rock, all being rocks: 
