Paleomagnetic dates of hominid remains from Yuanmou, China, and other Asian sites

Hyodo, Masayuki; Nakaya, Hideo; Urabe, Atsushi; Saegusa, Haruo; Xue, Shimin; Yin, Jiyuan; Xue-pin, JI

doi:10.1006/jhev.2002.0555

Cited by 72 publications

(31 citation statements)

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“…Currently, there are two conflicting views on the absolute dates of this stratigraphic level. While a younger chronology (Hyodo et al, 1993(Hyodo et al, , 2002 suggests ca. 1.0-0.8 Ma, an older chronology (Larick et al, 2001) proposes ca.…”

Section: Methodsmentioning

confidence: 99%

Advanced dental reduction in Javanese Homo erectus

Kaifu

2006

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The postcanine tooth crowns of late Early Pleistocene Homo erectus from Sangiran, Java, have been considered to be significantly smaller than those of older H. erectus remains of the same region. In this study, the degree of dental reduction in the former was examined by comparing their postcanine crown size with that of various regional groups of recent H. sapiens. The results show that overall crown size and degree of posterior molar reduction of Javanese H. erectus of the late Early Pleistocene was within the range of variation of recent H. sapiens. The position of this H. erectus group in the general trend of dental reduction in Early to Middle Pleistocene Asian archaic Homo is discussed. Implications for the phylogenetic discontinuity hypothesis between H. erectus and H. sapiens in Australasia are presented. In contrast to their reduced crown size, the Javanese H. erectus remains exhibit robust root systems, presumably a primitive retention. This observation indicates that reduction in crown size preceded reduction of the roots during evolution of Homo, at least in the Sunda region.

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Section: Methodsmentioning

confidence: 99%

Advanced dental reduction in Javanese Homo erectus

Kaifu

2006

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“…Among those studies, two representative paleomagnetic investigations of the sequence have yielded ambiguous results and implied age estimates for the hominin remains that differed by nearly 1 million years (Li et al, 1976;Hyodo et al, 2002). Li et al's (1976) results showed that the Yuanmou incisors occurred within a tiny reverse polarity magnetozone bracketed by normal polarity magnetozones.…”

Section: Previous Paleomagnetic Dating Of the Yuanmou Incisors And Armentioning

confidence: 99%

“…The three magnetozones were interpreted to be the Gilsa normal event, which has an estimated age of 1.7 Ma (Worm, 1997), and those portions of the Matuyama reverse chron that border it. By contrast, a more recently reconstructed magnetostratigraphy of the Yuanmou sequence placed the incisors above the Matuyama-Brunhes boundary (Hyodo et al, 2002), which has most recently been dated at 0.78-0.79 Ma (Singer et al, 2002). In the first study by Li et al (1976), samples were not analyzed by stepwise thermal demagnetization, which is now standard practice in evaluating sediments that contain hematite as a principal remanence carrier.…”

Section: Previous Paleomagnetic Dating Of the Yuanmou Incisors And Armentioning

confidence: 99%

“…In the first study by Li et al (1976), samples were not analyzed by stepwise thermal demagnetization, which is now standard practice in evaluating sediments that contain hematite as a principal remanence carrier. In the more recent work by Hyodo et al (2002), paleomagnetic analysis of the upper 88 m of M4 involved only six sampling levels, and the sampling route was about 600 m north of the hominin site (see Fig. 1 of Hyodo et al, 2002).…”

Section: Previous Paleomagnetic Dating Of the Yuanmou Incisors And Armentioning

confidence: 99%

“…In the more recent work by Hyodo et al (2002), paleomagnetic analysis of the upper 88 m of M4 involved only six sampling levels, and the sampling route was about 600 m north of the hominin site (see Fig. 1 of Hyodo et al, 2002). For these reasons, the earlier studies cannot adequately resolve the age of the Yuanmou evidence of Homo; a more thorough magnetostratigraphic study directly associated with the hominin fossil site is required.…”

Section: Previous Paleomagnetic Dating Of the Yuanmou Incisors And Armentioning

confidence: 99%

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