Quote:
Originally Posted by Acajack
More than, say, Rome? (Not trying to be an ass - just asking a question.)
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In an ancient old-world site like Rome, past cultural layers tended to just get laid down on top of one another, and were more robust to begin with (stone or concrete construction). In Athens or London, underground transit construction has been slowed down by the fact that even that many metres above the current surface level, you are still embedded in cultural material that's been built on top of, over and over again, over thousands of years.
Pre-contact sites in North America, especially in boreal or near-boreal areas like Ottawa, tend to be very superficial and sparse - campsites, small villages, seasonal occupations, etc. A single pass of a plough or a bulldozer can often disturb the entire cultural layer in the soil and obliterate all of the cultural information, other than a few robust and easily-identified artefacts. So, while adzes, arrowheads, pottery, etc., might be recognized in the disturbed soil, other material - chips, charred material, etc. - is going to just look like that much more dirt.