Does thermoluminescence dating
The dating was done using thermoluminescence, a technique that determines how long ago crystalline mineral was exposed to sunlight or heated.Humans are only thought to have inhabited the region for the past 30,000 years.
Reports on the tree-root explanation for the so-called Baigong pipes often lead back to this Xinmin Weekly article or lack citation.The iron pipes range in size, with some smaller than a toothpick.The strangest part is that they may be about 150,000 years old.Hematite also occurs as other masses of diagenetic "ironstone" that exhibit a wide and amazing range of bizarre shapes, which can be described as both "strangely shaped stones" and "rusty scraps".For example, strangely shaped stones, pipe-like features, and other concretionary masses have been observed and described from the Navajo and other Jurassic sandstones within Utah and adjacent states.
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Even within the known history of the area, the only humans to inhabit the region were nomads whose lifestyle would not leave any such structures behind.