OSTRACODS FROM SOME QUEENSLAND TERTIARY BASINS. Ill 
the latter species, however, in its greater height, broader anterior 
extremity, less inflated posterior, and more compressed carapace. 
The outstanding characteristics of this simple, smooth-shelled 
Cyprid are the outline of the valves, and the compressed nature of the 
carapace. There appears to be very little variation in the outline, and 
the ratio of height to length for most individuals has been found to be 
62:100. 
Localities and Range: In the Petrie Series: Brecknell’s Bore, at 
somewhere between 60 and 178 feet, subdivision 10 of portion 222, parish 
of Warner, county of Stanley, near Strathpine, between Brisbane and 
Petrie; from old well on portion 190, parish of Warner, approximately 
two miles W. of Strathpine ; Houghton ’s Bore, at about 45 feet, portion 
24, Parish of Warner, near Lawnton; from Simpson’s well, portion 186, 
parish of Nundah, county of Stanley, near Bald Hills. In the Baffle 
Creek Tertiaries: Prom No. 2 Shaft, portion 30, parish of Warro, county 
of Flinders, near Lowmead ; from various depths in the Lowmead No. 1 
Bore, in the N.W. comer of the above portion. In the Redhank Plains 
Series: Gully on portions 118, 119, 120, parish of Bundamba, county of 
Stanley, near Goodna. Probably Oligocene and Miocene. 
Supplementary Note. 
Possibly two other distinct species have also been found in The 
Narrows material, and one in the Baffle Creek material, but, because of 
the badly crushed and very fragmentary nature of the valves, accurate 
identification and systematic description has not been possible. However, 
some taxonomic work has been carried out and, when better material 
becomes available, it is hoped to complete the description of these forms. 
PART III. CORRELATION OF DEPOSITS. 
A. The Narrows. 
General Aspects. 
An extensive diamond-drilling campaign has been carried out 
recently by the Queensland Department of Mines in The Narrows 
Tertiary basin, in connection with the possible exploitation of its oil 
shales. Ostracods were discovered in the bore-cores from this drilling 
by Mr. L. C. Ball, Chief Government Geologist, and subsequent examina- 
tion by the Queensland Geological Survey revealed their presence in 
much of the material. They were seen to persist sometimes through 
quite considerable thicknesses of the Tertiary shales, and it was thought 
that their palaeontological study might permit the correlation of the 
strata in the various bores. 
An attempt has, accordingly, been made to arrive at a satisfactory 
correlation, by a detailed micropalaeontological examination of the 
ostracods contained in collections of samples from eight boreholes on 
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