139 
issued article this view is entirely withdrawn, and with it, we 
presume, the interpretation placed upon the fossil evidence, since 
we are now told that the former deposit is younger than the latter; 
in fact, we are led to infer that, like the Spring Creek beds with 
which they are finally correlated,* the Waurn Ponds limestones 
are overlain by the Older Basalt. Now, these limestones do lie 
immediately beneath basalt, but Messrs. Hall and Pritchard will 
certainly not contend that it is the older flow, as it covers also 
adjacent Eocene beds, which they still consider the youngest in 
the series. There is undoubted Older Basalt beneath the Eocene 
of Curlewis, a few miles from Waurn Ponds, and if it were present 
at the latter locality, which is apparently not the case, might we 
not also expect it to underlie the fossiliferous strata ? 
An exceedingly instructive outcrop of the Eocene has lately 
been worked at Birregurra by Mr. Mulder,+ to whom we are in- 
debted for examples of most of the fossils collected. Taken as a 
whole, the fauna belongs to the Muddy Creek type, but, curiously 
enough, includes also several species recorded hitherto only from 
Spring Creek, Table Cape, Cape Otway, or Aldinga Bay, amongst 
which may be quoted Ancillaria ligata, Cancellaria Etheridgei, 
Voluta anticingulata, V. Halli, Lsapis eothinos, Car ditella lamel- 
lata, C. radiata, Cardium pseudomagnum, Chione Pritchardi, C. 
multiteniata, Dosinia Johnstoni. This intermingling in one sec- 
tion of shells usually considered to be characteristic of diverse 
faunas has an important bearing upon the correlation of the 
EKocenes, as will be seen in the sequel. 
The beds at Shelford have so far yielded 201 species of mol- 
lusca, of which 143 occur also at Muddy Creek. The Schnapper 
Point and Bairnsdale deposits are probably of the same type, 
but the catalogues of species from them are too imperfect to allow 
of detinite comparisons. The majority of the fossils in the Geelong 
beds (including Western Beach, Lower Moorabool, Curlewis- 
Belmont, and one or two others) are recorded also from Muddy 
Creek, while, though Spring Creek is in closer proximity to them 
than to the Birregurra section, they contain fewer representatives 
of its fauna. A possible explanation may be that, notwithstanding 
the greater distance, the configuration of the coast in Eocene times 
was such as to offer less obstruction to the migration of species 
between Spring Creek and Birregurra than between the former 
locality and Geelong. 
Community is the fauna of Muddy Creek also obtains in 
the gastropod- bed of the Murray River, near Morgan, though the 
distance is so great. 
Two of the most interesting deposits remain to be mentioned 
viz., those at Cape Otway and at the Gellibrand River, both on 
* Op. cit. Summary, page 166. 
+ Catalogue of Fossils from Birregurra, Geelong Naturalist, April, 1896. 
