University Of Tasmania

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Studies in tertiary foraminifera.

posted on 2023-05-27, 18:34 authored by Quilty, P. G
The Plantagenet Beds generally are devoid of diagnostic fossils, but a bryozoal calcarenite from the Beds at Nanarup, near Albany, has yielded a well preserved fauna. A single sample of 25,000 specimens contains 166 categories (form, subspecies, species, genus etc.). All are described and figured. The following are defined as new: Haplophragmoides regularis, Textularia nanarupensis, T. colemani, T. simpsoni, T. jutsoni, Bolivinella tailori, Palmula hodgsoni, Saracenaria australiae, Vaginulina hornibrooki, Pseudopolymorphina carteri, Buliminella rutledgei, Angulogerina hunti, Epistominella macgowrani, Schackoinella wadeae, Australorotalia westraliensis n. gen., n. sp. (Rotaliidae), Operculina crespinae, Globigerina jenkinsi, G. ouachitaensis form basaapertura n. form, Eponides pustulosus, Linderina glaessneri and Hanzawaia westraliensis. Ten percent of the fauna is composed of planktonic species, of which Globanomalina micra, Globigerina ampliapertura form ampliapertura and Globigerapsis index are dominant, the latter making up 65% of the planktonic element. Statistical analysis of 1600 specimens of Globigerapsis index casts grave doubt on the biological validity of the planktonic foraminiferal genera Globigerinita, Tinophodella, Globigerinatheka and Inordinatosphaera. The sediments are correlated mainly within Australasia, but also throughout the Indo-Pacific region, Trinidad and southeast Asia. The planktonic fauna allows correlation with Carter's Faunal Unit 2, the Globorotalia cocoaensis Zone of Trinidad and the Globigerina gortanii turritilina Zone of Tanzania. The age of the fauna is Upper Eocene (Priabonian) . The composition of the fauna shows that it was deposited in water about 100' -120' deep under subtropical conditions. Reconstruction of the Upper Eocene palaeogeography suggests that the sediment accumu- lated in the lee of a series of islands of Precambrian rock.


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Copyright 1968 the author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s). Thesis (Ph.D.) - University of Tasmania, 1968. Erratum slip tipped in. Includes bibliographical references. Contents: v. 1 - Upper Eocene Foraminifera from the Plantagenet beds, southwest Western Australia. v. 2 - The biostratigraphy of Tasmanian tertiary marine rocks

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