Magnetic Polarity Stratigraphy of the Pleistocene Section at Portland (Victoria), Australia
| Autor: | Thomas H. V. Rich, Bruce J. MacFadden, Michael J. Whitelaw, Phil McFadden |
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| Rok vydání: | 1987 |
| Předmět: |
010506 paleontology
Paleomagnetism 010504 meteorology & atmospheric sciences Pleistocene Context (language use) 01 natural sciences Sedimentary depositional environment Paleontology Arts and Humanities (miscellaneous) Stratigraphy Absolute dating Section (archaeology) General Earth and Planetary Sciences Bay Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Quaternary Research. 28:364-373 |
| ISSN: | 1096-0287 0033-5894 |
| DOI: | 10.1016/0033-5894(87)90004-4 |
| Popis: | Three to seven oriented paleomagnetic samples were collected from 16 sites in the Nelson Bay and Bridgewater formations at Portland, Victoria, which contains the recently discovered Nelson Bay local fauna (L.F.). The entire section has reversed polarity. These results, along withGloborotalia truncatulinoideswithin the section, and the presence of underlying middle Pliocene-dated basalts, indicate that the Portland section, and the included Nelson Bay L.F., was deposited within the late Matuyama Chron between 1.66 and 0.73 myr ago. This represents the first well-documented pre-14C Pleistocene mammalian fauna in Australia calibrated in direct stratigraphic context with absolute dating methods. In addition, the reversed polarity for the Bridgewater Formation confirms the previous hypothesis that the depositional history of this beach-sand deposit is time-transgressive across the Brunhes-Matuyama boundary. |
| Databáze: | OpenAIRE |
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