The taxonomy, age and environment status of the Yuanmou hominoids had been controversial since their discovery. We launched new excavations and investigations in the Yuanmou Basin and analyzed both old and newly collected data. We conclude that all hominoids from the Yuanmou Basin and the so-called Pliocene hominids can be attributed into a single species, and its valid nomination is Lufengpithecus hudienensis. It is different from Lufengpithecus lufengensis and Lufengpithecus keiyuanensis. Based on the faunal comparison and paleomagnetic correlation, the strata yielding the Yuanmou hominoids are older than those of Lufeng hominoids and younger than those of the Kaiyuan hominoids. The age of the Yuanmou hominoids is Late Miocene. The environments of the Yuanmou hominoids were subtropical, hilly, with some dense forestry and partial transitional bushes and seasonal climate.
At present, the boundaries between the Pliocene and early Pleistocene, the early Pleistocene and middle Pleistocene, the middle Pleistocene and late Pleistocene, the Pleistocene and Holocene can be put on the boundary surface of Matuyama/Gauss, Brunhes/Matuyama and near the Blake and Gothenburg events based on the studies of biostratigraphy, paleomagnetics and chronology. Their age is 2.4,
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