Quaternary dating methods ppt

24-Jun-2017 11:24

The age of terrestrial Quaternary deposits beyond 400 ka is difficult to assess by chronometric dating, particularly when volcanic layers are missing.

Earlier attempts to date the Mauer sands, namely by thermoluminescence of feldspar and electron spin resonance (ESR) of quartz as well as uranium-series (US) dating of an elephant tusk, were unsatisfactory (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).

, was found in 1907 in fluvial sands deposited by the Neckar River 10 km southeast of Heidelberg, Germany.

The fossil is an important key to understanding early human occupation of Europe north of the Alps.

Mammalian biostratigraphy places the find layer in a young, but not the youngest, interglacial of the Cromerian complex, probably Cromerian IV or Cromerian III (2, 4).

The two sand samples Mau 1 and Mau 2 were taken 0.5 m below and above the gravel bed.These numeric ages assign the interglacial with at Mauer definitely to MIS 15, which is in full accordance with the above-mentioned biostratigraphic and geological evidence.Taking into account that the find layer was deposited in an interglacial stage, the bracketing data of M0503 and Mau 3 give additional support to this correlation (i.e., it is confirmed by a set of five dates).We have calculated 108 dates (10–20 per dated layer) and can minimize errors caused by incomplete reset of the luminescence clock—resulting in age overestimation—due to insufficient light exposure in the fluvial sediment environment (7, 8).Ages of 607 ± 55 ka, 603 ± 56 ka, 554 ± 33 ka, and 502 ± 27 ka were obtained for the lower sands, whereas the upper sands gave ages of 508 ± 50 ka and 420 ± 23 ka (Fig. Eight herbivore teeth (five from the lower sands and three from the upper sands) were analyzed with the ESR-US technique (9).

The two sand samples Mau 1 and Mau 2 were taken 0.5 m below and above the gravel bed.These numeric ages assign the interglacial with at Mauer definitely to MIS 15, which is in full accordance with the above-mentioned biostratigraphic and geological evidence.Taking into account that the find layer was deposited in an interglacial stage, the bracketing data of M0503 and Mau 3 give additional support to this correlation (i.e., it is confirmed by a set of five dates).We have calculated 108 dates (10–20 per dated layer) and can minimize errors caused by incomplete reset of the luminescence clock—resulting in age overestimation—due to insufficient light exposure in the fluvial sediment environment (7, 8).Ages of 607 ± 55 ka, 603 ± 56 ka, 554 ± 33 ka, and 502 ± 27 ka were obtained for the lower sands, whereas the upper sands gave ages of 508 ± 50 ka and 420 ± 23 ka (Fig. Eight herbivore teeth (five from the lower sands and three from the upper sands) were analyzed with the ESR-US technique (9).Given the associated mammal fauna and the geological context, the find layer has been placed in the early Middle Pleistocene, but confirmatory chronometric evidence has hitherto been missing.