A last interglacial embayment fill at Normanville South Australia, and itsneotectonic implications

Stratigraphic, sedimentological, amino acid racemisation, thermoluminescenc e (TL) and foraminiferal analyses of an embayment fill at Normanville, sout h of Adelaide, have established the presence of the last interglacial (Oxyg en Isotope Substage 5e) subtidal sediments of the Glanville Formation at el evations of up to 12 metres AHD. Overlying aeolian deposits, dated at about 60 to 50 ka, are possible equivalents of the Fulham Sand of the Adelaide a rea. TL dating of the Fulham Sand from its type borehole location yielded a n age of 74.9 +/- 6.9 ka, considerably older than previous estimates but co mpatible with a recent re-evaluation of the age of the Pooraka Formation. The altitude of the last interglacial shoreline at Normanville at + 12 m AH D is considerably higher than at Dry Creek (- 1.26 m AHD), Sellicks Beach ( + 4 to 5 m AHD), Victor Harbor (+ 6 m AHD) and Hindmarsh Island (+ 1 m AHD) and implies 10 m of uplift at this site relative to South Australian bench mark sites. The variation in altitude of the last interglacial Glanville F ormation from Gulf St Vincent, across Fleurieu Peninsula to the Murray Basi n reflects continuation of the tectonic activity revealed by dislocation of older Miocene and Earliest Pleistocene limestones.