On ours, we built wooden frames, approximately 2m x 1m x 25 cm.  We put in three different layers
of dirt, a hard red clay for sterile soil, a sandy loam, and then a rich black topsoil.  For artifacts
we hand no problem getting obsidian and making some flake tools, and buying some simple earthenware
pots.  We also put in a few cobbles for archaeological features.

You can check out a few of the photos from this at http://www.nbz.or.jp/eng/excavate05.htm

Best, Mark Hall
Niigata Prefectural Museum


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