Madden was able to conclusively identify 565 Native American dice from 45 different sites and designate an additional 94 artifacts as “probable” dice. Objects with a drilled or pierced hole were excluded from his assessment because they could just as easily be beads or other decorative objects rather than dice. He also excluded objects whose two sides could only be distinguished by shape, with no clear markings, for similar reasons. The oldest artifacts, from Folsom deposits in Wyoming, Colorado, and New Mexico, date back to the end of the last Ice Age, some 12,000 years ago.
According to Madden, dice and gaming in these societies weren’t anything like contemporary
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