Dating done by the Beijing Institute of Geology determined these iron pipes were smelted about 150,000 years ago, if they were indeed made by humans, according to Brian Dunning of Skeptoid.com.
And if they were made by humans, history as it is commonly viewed would have to be reevaluated.
Quote:The site, known by local people as "the ET relics", is on MountBaigong about 40 kilometers to the southwest of Delingha City.
On the north of the mountain are twin lakes dubbed as the "lover Lakes", one with fresh water and the other with salty water.
The so-called ET relics structure is located on the south bank of the salty lake. It looks like a pyramid and is between 50 to 60meters high.
At the front of the pyramid are three caves with triangular openings. The cave in the middle is the biggest, with its floor standing two meters above the ground and its top eight meters above the ground.
This cave is about six meters in depth. Inside there is a half-pipe about 40 centimeters in diameter tilting from the top to the inner end of the cave. Another pipe of the same diameter goes intothe earth with only its top visible above the ground.
Above the cave are a dozen pipes of various diameters which runinto the mountain.