228 Frederick Chapnian : 



OLDER PLEISTOCENE FOSSILS FROM THE OOLDEA 

 DISTRICT. * 



Order FORAMINIFERA. 



Genus Orbitolites, Lamarck. 



Orhitolites complanata^ Lamarck. 



Orbitolites complanata^ Lamarck, 1801, Syst. Aiiim. 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), tlirough 

 Janjukian (Mallee Bores) to Werrikboian and Pleistocene (Well 

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



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

 together ^tith mollusca {Clanculus and Brachyodonfes) was pre- 

 sented to the National Museumby Mr.. R. H. MattheAvs, who obtained 

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



0. complatiata occurred in the Croydon Bore as far down as 450 

 feet, and was there associated with Laganum and Glycimeris. At 

 395-415 feet the associated fauna was Ostrta anf/asi, Glycimeris 

 obliquus, G. co?ivexus, Limopsis fenisoiii (recorded as L. helcheri), 

 Crassattllites ohloaya, Mesalia 2^^ovisi and Cassis fimbriatus, 

 This fauna contains some archaic forms, as Mesalia jjrovisi and 

 Glycim^eris cofivexiis, 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 Anadara, Gray. 

 Area (Andara) 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 Melbourne 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. 



