100 
E. DE C. Clarke, C. Teichert and J. R. H, McWhae. 
Adeonellopsis clavata (Stol.) 
Retepora adculifera (McG.) 
Tietepora spp. 
(b) Cyclostoinata. 
Cyisia acropora Busk. 
The speciofi listed al)OVt* include forms some of which are recorded 
only as fossils and otliers are found living in Avaters around the Australian 
coast. The fossil si)ecies are Macropora clurkei^ CeUctria depressii, Ilbicksina 
geminatdj Retepora aclcuUfera^ Iclouionea incurdd^ Spiroporina rerticillata 
and 7'ecticavea ef. schnapjierensis. 
The assemblage of species from both localities is typically Middle 
Miocene, all the fossil species being described from beds in Victoria and 
South Australia^ which are referable lo the llalcombian Stage, and the 
recent si)ecies Ijeing found in association with these in deposits ranging 
from Middle Miocene upwards. It is not always desirable to make long 
distance correlations of stratigi’aphic stages, but the followiiig observations 
may be of interest regarding the relationships of the Lake CoAvaii and Norse- 
man bryozoal limestones with tliose of Victoria and South Australia. 
Macropora chtrkei is the commonest species of Bryozoa in the Lake 
CoAvan iimesfone, and in A'ictoria it ranges from the Janjukian Stage up to 
the Mitchellian Stage. The assemblage to Avhich the species belongs in 
Western Australia is typical of the Balcombian Stage in Victoria Avhere it 
is ahvays associated Avitli a characteristic assemblage of foraminifera. 
Eoraminifera appear to be absent in the material under consideration, and 
the absence of these microsco]>ic forms suggests a close relationshi]) of the 
‘Western Australian deposits with those in York Peninsula, South Australia. 
It is furtlier suggested that the Lake VoA\-an limestone can be correlated Avith 
the loAver jxirtion of 'the Balcombian stage as developed in Gippsland, Vic- 
toria. 
The genus Retepora is the common form in the limestone from Norse- 
man, Avhere the liryozoal assemblage is associated with the gasteropod Titr- 
ritella aldingae Tate, a form Avhich is common not only at Aldinga, South 
Australia, but also in the fossiliferous marls in the deep bores in Gippsland, 
AAdiich are referred to the Janjhikian Stage. But the species ranges up 
into the Balcombian Stage, and until some evidence based on the occurrence 
of zonal foraminifera. can be found in the Norseman beds the limestones 
are referred to the basal portion of the Balcombian. 
[“Lake Cowan limestx)no’’ is material collected from Outcrop A at the Peninsula, 
“Limestone from Norseman” is material from the occurrence discovered by Campbell 
near the causeway nortli of Norsemur. (E. de C. C. and C. T.)] 
VTI. ■REFERENCES. 
Campbell, W. B., 190(i; Tlie geology and uihiernl resources of the Norseman 
District, Dundas Goldfield. Geol. Hnr. Iflc.st. Auni., Bull, 21. 
Chapman, P., and Crespiu, T., 1934: The i)alaeontology of the Plantagenet Beds 
of Western Australia. Joarn. Boy, Soc. iVest Aust., Vol. XX, pp. 103-136. 
Clarke, E, do C., 1925: The geology of a portion of the East Coolgardie and 
Xorth-East Coolgardie Goldfields including the mining centres of Monger 
and St. Ives. Geol. Siirv. PVxf Ansi,, Bnll. 90. 
Clarke, E. de C., 1935: Re])ort of committee on the structural and land forms 
of Australia and Xcav Zealand. Aust. and N.Z. Ass. Adv. Sci., A ol. XXII, 
p. 467. 
