444 PROCEEDINGS OF SECTION C. 
The identified fossils of the above lists are, with one or two 
exceptions, also recorded from the Murray cliffs, either from the 
gastropod beds or from the calciferous rock. A large proportion 
of them occur also in the lower beds at Muddy Creek. In his 
article on the Basin of the Lower Murray, Professor Tate 
classes together the three beds just named in the Middle 
Murravian group, which corresponds very nearly with that which 
is here called Lower Tertiary. By Victorian geologists the 
Muddy Creek beds are usually termed Oligocene, and those on 
the Glenelg, Miocene, but this classification is not universally 
accepted. Professor Martin Duncan, F.R.S., in remarking upon 
the Australian Tertiary beds known to him from fossils and 
rock specimens submitted, as well as through survey reports, 
advised that they should all be called Cainozoic, without further 
subdivision, as he considered the upper member of the fossilferous 
series to be merely a deep-sea deposit (in a general sense), and 
contemporaneous with those below it.* From a perusal of his 
article, I understand Professor Duncan to mean, by the upper 
member of the series, the calciferous rock of the Glenelg and its 
equivalent on the south coast, and by the lower, the gastropod 
beds of Spring Creek and other places on the same coast. 
The recognition of two separate zones in the Muddy Creek 
beds has materially modified the estimate formed of their age 
when they were supposed to consist of a single deposit. On the 
basis of the percentage of living to extinct forms, the upper may 
still be regarded as Oligocene, or perhaps early Miocene, but the 
lower should now be referred to the Eocene period. That the 
fossils of the Grange Burn polyzoal rock are of a marked Eocene 
type has already been noted. The Glenelg and Apsley deposits 
must, I think, be placed in the same group, not only on account 
of the community of fossils, but also because of the significant 
fact mentioned by Professor Tate, that the equivalents of the two 
sets of strata, viz., the gastropod bed and the calciferous rock, 
are, in the River Murray sections, inseparable. 
This view is confirmed by the occurrence of fossils belonging to 
the lower zone of Muddy Creek at several localities in the Glenelg 
basin, as well as in the neighbourhood of Apsley. They have 
been mostly found in well-sinkings, and their number is therefore 
not great, especially as the settlers seldom think it worth while 
to preserve such apparently useless articles as fragile or, perhaps, 
even fragmentary shells. In common with other searchers after 
natural curiosities, I have often been as much annoyed as 
interested by being Zo/d of strange-looking objects unearthed by 
a hospitable friend, but which he had unfortunately /os¢ some 
time previously. 
At Tea-tree Creek, near Harrow, casts in ironstone of the 
following species were obtained :— 
* Quart. Jour. Geol. Soc., XXvi., p. 284 (1870). 
