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originally posted by: Plotus
Well some think they have found the answer...
.. Talking of birds, all through the Peruvian and Bolivian Montana is to be found a small bird like a kingfisher, which makes its nest in neat round holes in the rocky escarpment above the river. These holes can plainly be seen, but are not usually accessible, and strangely enough they are found only where the birds are present. I once expressed surprise that they were lucky enough to find nesting-holes conveniently placed for them, and so neatly hollowed out - as though with a drill. "They make the holes themselves." The words were spoken by a man who had spent a quarter of a century in the forests. "I've seen how they do it, many a time. I've watched, I have, and seen the birds come to the cliff with leaves of some sort in their beaks, and cling to the rock like woodpeckers to a tree while they rubbed the leaves in a circular motion over the surface. Then they would fly off, and come back with more leaves, and carry on with the rubbing process. After three or four repetitions they dropped the leaves and started pecking at the place with their sharp beaks, and - here's the marvellous part - they would soon open out a round hole in the stone. Then off they'd go again, and go through the rubbing process with leaves several times before continuing to peck. It took several days, but finally they had opened out holes deep enough to contain their nests. I've climbed up and taken a look at them, and, believe me, a man couldn't drill a neater hole!" "Do you mean to say that the bird's beak can penetrate solid rock?" "A woodpecker's beak penetrates solid wood, doesn't it? ...No, I don't think the bird can get through solid rock. I believe, as everyone who has watched them believes, that those birds know of a leaf with juice that can soften up rock till it's like wet clay."
originally posted by: Harte
So, now we get to pretend that Geologists can't identify stone.
originally posted by: fromtheskydown
Obviously the methodology is a puzzler but, not knowing enough on the subject, I am interested in the reasoning behind the design and function of the blocks at Puma Punku.
originally posted by: Blue Shift
originally posted by: Harte
So, now we get to pretend that Geologists can't identify stone.
From what I gather, it's not so much the stone but the organic material inside the stone, which is apparently unusual to find deep in volcanic rock since it tends to get burned up and stuff. There may be some problem with it being from samples that are not taken directly from the stones in situ, but from similar "unprotected" material nearby. It will be interesting to see if they can get some dating done on it.
Although carbon-based lavas, known as carbonatites, are found throughout history, the Oldoinyo Lengai volcano, located in the East African Rift in northern Tanzania, is the only place on Earth where they are actively erupting.
The giant blocks of red sandstone raise another problem. Sandstone is a sedimentary rock composed of quartz grains and a clay binder. There are several possible geological sources but none correspond to the stones of the archaeological monuments. No known quarry is able to provide massive blocks of 10 meters long. In addition, the local stone is friable and small in size. Scientists have discovered under the electron microscope that the red sandstone of Pumapunku cannot come from the region because it contains elements, such as sodium carbonate, not found in the local geology.