228 Frederick CJia/nnaii : 



OLDER PLEISTOCENE FOSSILS FROM THE OOLDEA 

 DISTRICT. 



Order FORAMINIFERA. 



Genus Orbitolites, Lamarck. 



Orhitolites complanata, Lamarck. 



Orhitolites comjjldnata, Lamarck, 1801, Syst. Anim. sans Vert., 

 p. 376. Carpenter, 1856, Phil. Trans., p. 224, pis. IV-IX. Chap 

 man, 1913, Proc. R. Soc. Vict., vol. XXVI. N.S. pt. I. p. 170. 



This species ranges from the Balcombian (Muddy Creek), through 

 Janjukian (Mallee Bores) to Werrikooian and Pleistocene (Well 

 borings, Murray Flats, and Croydon Bore, near Adelaide). 



A fine sample of limestone, largely composed of the above fossil, 

 together with mollusca (Clancnhis and ]irach)/n(Jonfes) was pre- 

 ssnted to the National Museum by Mr. R. H. Matthews, who obtained 

 it from Yorke Peninsula, six miles N.W. of Yorketown. 



0. coinplanata occurred in the Croydon Boic as far down as 450 

 feet, and was there associated with Lat/auiim and (Tli/cimeris. At 

 395-415 feet tlie associated fauna was Ostrea an(/asi\ Glycimeris 

 obliquys, G. conve.vus, Limopsis fen/so/ii (recorded as L. hrlcheri), 

 CrassattUitfs ohlonga, Mesalia provisi and Cassis fimhriatus, 

 This fauna contains some archaic forms, as Mtftalin prorisi and 

 Glycimtris cnnve.rus, and the age of the deposit is certainly Werri- 

 kooian or Upper Pliocene. In the present sample, as in the raised 

 beach at Yorke Peninsula, the beds are slightly younger, and may 

 be referred to, the older raised beach stage, or Lower Pleistocene. 



Chandler Collection. 



Class PELECYPODA. 

 Fam. ARCIDAE. 



Genus Area, Lamarck. Subgenus AnadaPa, Gray. 

 Area (A/if/ara) trapezia, Deshayes. 



Area trapezia, Deshayes, 1840. Mag. Zool., p. 21, 3 figs. 



The shell attains a large size in this bed, and vies with similar 

 large specimens in the Pleistocene of the West ]\Ielbourne Swamp. 

 They reach a length of 104 mm., and a height of 81 mm. ; the shells 

 are embedded in a fine calcareous mud. Although the abundance 

 of this species might suggest estuarine influence, the remainder of 

 the associated mollusca are of the ordinary open water type. 



Chandler Collection. 



