Journal article

Foraminiferal biofacies of the Miocene warm to cool climatic transition in the Port Phillip Basin, southeastern Australia

TL Gourley, SJ Gallagher

JOURNAL OF FORAMINIFERAL RESEARCH | ALLEN PRESS INC | Published : 2004

Abstract

The Miocene marine sediments of the Torquay Group in the Port Phillip Basin of southeast Australia were deposited at a paleolatitude of at least 45°S. Nevertheless, the presence of subtropical larger foraminifers, plankton of the "Orbulina" bioseries and other biofacies signals testify to a time of global warmth and correspond to the "Miocene Climatic Optimum". Throughout the Early Miocene to early Middle Miocene, bioclastic calcarenite of the Batesford Limestone was deposited in warm, sub-tropical and oligotrophic marine conditions in a high-energy inner-shelf (<70 m depth) environment. During the early Middle Miocene, a distinct change in foraminiferal assemblage accompanied the transition..

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