442 PROCEEDINGS OF SECTION C. 
will be brief, and confined mainly to their relations to other 
members of the Tertiary series. 
In the Grange Burn, and at a lower level than any of the 
Muddy Creek sections, a great change is observed in the character 
of the strata. The soft clayey beds, so rich in mollusecan forms, 
give place to a hard polyzoal limestone, containing numerous 
spines of echini, but only occasional shells. A similar rock forms 
high cliffs on the Glenelg and Crawford rivers, and crops out, 
amongst other localities, on the South Australian border near 
Apsley, and in the Salt Creek at Dergholm. Professor Tate 
records the occurrence of strata presenting the same general 
characters on the Murray Cliffs near Morgan, where, just as in 
the Grange Burn, the gastropod beds are succeeded by limestones 
and calciferous rocks, with pectens, palliobranchs, echinoderms, 
polyzoa, &c., as the prevailing fossils.* 
In speaking of the River Murray section, Professor Tate says, 
“Here, because of the slight admixture of argillaceous matter in 
the matrix, the tests of gastropods and of many bivalves have 
been well preserved, but this condition is maintained only for 
about 350 yards, measured along the front of the cliff; beyond 
that the shells gradually disappear with the diminution of the 
clay, and finally, at half a mile distant, the beds have merged 
into the limestones, caverned with casts, and the ordinary 
calciferous rock.” 
This description would serve almost as well for the sections on 
the Grange and Muddy Creeks, the only difference being that the 
change from argillaceous deposits, with their profusion of fossils, 
to the polyzoal rock is here a sudden and not a gradual one. 
Collectors at Muddy Creek have always found it dificult to tear 
themselves away from the prolific shell beds, and the less inviting 
polyzoal rock, close at hand, has thus been almost entirely 
neglected. | Whoever undertakes its examination is likely, 
however, to be amply rewarded, and I strongly advise some of 
our young Victorian geologists to commence the work. 
From a portion of the rock, detached on a late visit, I obtained 
a few specimens, which were sent to Professor Tate for deter- 
mination. His report upon them is so interesting, and so fully 
supports the argument of this paper, that I quote it verbatim, 
“The Grange Burn fossils are Eocene. I identify them as 
follows :— 
Terebratulina scoulart, Tate ; a common Eocene species. 
Terebratella tubulifera, new sp. 
Isis, sp. undescribed ; Kocene at Mount Gambier, Muddy 
Creek, and Yorke Peninsula. 
Temnechinus novus, Laube ; Kocene, River Murray cliffs. 
* - Notes on the Physical and Geological Features of the Basin of the Lower Murray River.’” 
Roy. Soc. of South Australia, 1884, 
