Which of the following is not a chronometric dating method radioisotope dating

Posted by / 21-Oct-2017 09:21

Hence, the interglacial represented by the Mauer lower sands is usually correlated with MIS 13 or MIS 15, orbitally tuned dates of 478–533 ka and 563–621 ka, respectively (6).In view of the importance of this site for documenting the appearance of in Europe, more accurate dating is desirable.The error-weighted mean of their respective IR-RF ages (607 ± 55 ka and 603 ± 56 ka) can be calculated (11) and gives the IR-RF sediment age of 605 ± 42 ka for this horizon, which is supported by the ESR-US age of the sample M0507 (624 ± 79 ka), whose depth level matches exactly that of the original find.Assuming that each of these three data represents the actual age of the layer, their weighted mean yields 609 ± 40 ka.

However, for five samples (i.e., ≈25% of the material analyzed), determination of the -parameter was not possible, and this quantity was fixed equal to −1 to allow an age calculation.Age estimates for the Mauer mandible have been advanced previously.The Mauer sands are overlain by several Middle and Late Pleistocene glacial loess layers with interstratified interglacial paleosoil horizons, which constrain the age of the fossil to older than 350 ka (3).Magnetostratigraphic studies on clay layers below and within the Mauer sands show normal polarity.Thus, they belong to the Brunhes chron and are younger than 780,000 y (3).

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A minimum age for the SH deposits is now reported to be 530 ka (19), whereas specimens from the British, French, and Italian localities are dated at 500 ka or younger.