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Worm, A. Ahmed, N. Ahmed, H. Islam, M.
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Magnetostratigraphic dating of mammalian fossils in Junggar Basin, northwest China
Magnetostratigraphic dating of mammalian fossils in Junggar Basin, northwest China | SpringerLink
The fluvio-lacustrine sequences in the Nihewan Basin, northern China provide important terrestrial archives of paleoclimate and paleoenvironment as well as an important source of Paleolithic settlements and therefore early human occupation in the eastern Old World. Magnetostratigraphic dating of the sequences has permitted the precise timing of the basin infilling Here we report new magnetostratigraphic results that place stringent age controls on the Huojiadi Paleolithic site in this basin. Partially-oxidized magnetite and hematite were identified as the major carriers for the characteristic remanent magnetizations. Magnetostratigraphic results show that the Huojiadi sequence recorded the very late Matuyama reverse chron and the Jaramillo normal subchron. The stone artifact layer resides in the Jaramillo normal subchron, yielding an estimated age of around 1. Furthermore, by combining our magnetostratigraphy and previously published magnetochronology data, a magnetochronological sequence of the early Pleistocene Paleolithic sites in the Nihewan Basin has been established.
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Magnetostratigraphic dating of the hominin occupation of Bailong Cave, central China
Magnetostratigraphy is a geophysical correlation technique used to date sedimentary and volcanic sequences. The method works by collecting oriented samples at measured intervals throughout the section. The samples are analyzed to determine their characteristic remanent magnetization ChRM , that is, the polarity of Earth's magnetic field at the time a stratum was deposited. This is possible because volcanic flows acquire a thermoremanent magnetization and sediments acquire a depositional remanent magnetization , both of which reflect the direction of the Earth's field at the time of formation.
The fluvio-lacustrine sedimentary sequences in the Nihewan Basin, northern China, are important for studying Quaternary land mammal evolution and Paleolithic settlements in the high-latitude temperate East Asia. Here we report new magnetostratigraphic results that constrain age of the Hougou Paleolithic site in this basin. Magnetite and hematite were identified as carriers of the characteristic remanent magnetizations, with the former being dominant.
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