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There are still, however, conflicting opinions regarding the age of the Yuanmou Fm. Older research by Liu and Ding (1984) noted that the faunal sequence at the site was inverted, with more extinct species in the upper levels than deeper in the deposit, and based on this evidence they suggest to put the age of the Yuanmou man into the Middle Pleistocene, that is about 0.5 - 0.6 Ma BP.
Such a preserved specimen is called a "fossil" if it is older than some minimum age, most often the arbitrary date of 10,000 years.
The observation that certain fossils were associated with certain rock strata led early geologists to recognize a geological timescale in the 19th century.
The development of radiometric dating techniques in the early 20th century allowed geologists to determine the numerical or "absolute" age of the various strata and thereby the included fossils.
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Later, stone artifacts, pieces of animal bone showing signs of human work and ash from campfires were also dug up from the site.
The fossils are on display at the National Museum of China, Beijing.
The remnants of Yuanmou Man were discovered on May 1, 1965, by the geologist Fang Qian, who was working for the Geological Mechanics Research Institute. (1983) believed the age of Yuanmou Man was Middle Pleistocene, did not exceed 0.73 Ma BP, and was probably contemporaneous with Peking Man.
Based on the palaeomagnetic dating of the rock they were found in, it was initially estimated that the fossils were about 1.7 Ma BP and thus represented the earliest fossils of human ancestors found in China and East Asia. Subsequently, Qian (1985) conducted further studies of the age of Yuanmou Man, but still obtained an age of 1.7 Ma BP, or Early Pleistocene.
(this skepticism has since lifted, with additional findings in the last 25 years). (1978) suggested that Member 4 in the upper part of the formation is middle Pleistocene and should be designated the Shangnabang Fm., while the sediments exposed at Shagou containing Enhydriodon cf. These investigations initiated beneficial discussion, although further conflicting opinions persist regarding depositional environment, paleoclimatology, glaciation, and other aspects. (1991), palaeomagnetic dates from near where the teeth were recovered average 1.7 Ma BP.Tags: Adult Dating, affair dating, sex dating