Screening (sifting, sieving) is relatively ineffective, because this is what you're confronted with once you've filled your screen.
In 2010, we used screens only as a backup, finding that it was more efficient, and that we actually could be more confident of finding things (even very small things) through straightforward troweling.
Bottom line: Nikumaroro isn't exactly a HARD place to do archaeological fieldwork, but it is an extremely SLOW place to do it, and artifacts, bones, and other items of interest don't exactly leap out at one.
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