Posted 12 August 2009 - 08:46 PM
Posted 13 August 2009 - 12:34 PM
Edited by Lacrymosa, 13 August 2009 - 01:06 PM.
Posted 13 August 2009 - 08:34 PM
No. I think the reason we need to dig for artifacts is that none left on the surface of the ground. If you drop a vase on street, it will be gone in no time. The only ancient artifacts that still exist were either buried by people (e.g. graves) or by nature (e.g. volcano erruption, etc). For fossils, the first step to form a fossil is to have the corpse buried, if not, the corpse will be gone very fast. A large portion of fossils were formed because the animals died from sinking into mud pools, quicksand, etc. In time, mud, dirt, sand and other sediments will become hard and form rocks. New sediments will cover the old rock layers and eventually become rocks, etc. So the deeper the rock layer, the more ancient the fossils we will find. This process does not always happen though. Sediments may erode or carried away by wind, river, etc. We can never find a place on earth that has fossils from all time stack on top the other.
Thanks. But how about ancient sites of villages or even cities? When we found them they appeared to have been built at a stratum much lower than to-day's level.
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