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Others have said iron sediments may have washed into the fissures, carried with water during floods.Though Xinhua and other publications in China have referred to a pyramid or even a mysterious pyramid in which the pipes were found, some have said it was a pyramid-shaped natural formation.Brenda Beitler notes the presence of hollow "subhorizontal planar strata-bound pipes" and "vertical pipes", which have been created by the precipitation of hematite within the Navajo Sandstone.In addition, the bleached sandstone seen in the picture of the cave entrance is typical of sandstones, in which natural pipe-like features have been found.Liu Shaolin, the engineer who did the analysis, told Xinhua: “This result has made the site even more mysterious.” “Nature is harsh here,” he said.“There are no residents let alone modern industry in the area, only a few migrant herdsmen to the north of the mountain.” To further add to the mystery, Zheng Jiandong, a geology research fellow from the China Earthquake Administration told state-run newspaper People’s Daily in 2007 that some of the pipes were found to be highly radioactive.
The pipes lead into a salty lake, though a twin lake nearby contains freshwater.
In a mysterious pyramid in China’s Qinghai Province near Mount Baigong are three caves filled with pipes leading to a nearby salt-water lake.
There are also pipes under the lake bed and on the shore.
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.
The state-run news agency Xinhua in China reported on the pyramid, the pipes, and the research began by a team scientists sent to investigate in 2002.