The first record of a Maastrichtian ammonite from the Perth Basin,Western Australia,and its biostratigraphical significance |
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| Authors: | Kenneth J. McNamara John P. Rexilius Neil G. Marshall Robert A. Henderson |
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| Affiliation: | 1. Western Australian Museum , Francis Street, Perth, Western Australia, 6000;2. E.C.L. Australia Pty Ltd , 16 Altona Street, West Perth, Western Australia, 6000;3. Department of Geology , University of Sydney , New South Wales, 2006;4. Department of Geology , James Cook University , Townsville, Queensland, 4811 |
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| Abstract: | The first known ammonite from the Maastrichtian of the Perth Basin, a single, incomplete specimen of Grossouvrites gemmatus (Huppé, 1854), is described from core material from the Lancelin No. 1 borehole. Foraminiferal and nannoplankton evidence date the ammonite as middle Maastrichtian; its age is also assessed on the basis of dinoflagellate assemblages from this section, but these give a less precise dating. The position of the ammonite with respect to a mid-Maastrichtian disconformity, which probably extended along much of the Western Australian margin is discussed. |
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| Keywords: | Ammonite Maastrichtian Perth Basin foraminifers nannoplankton |
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