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They didn't find some new rocks. They reexamined a bunch of artifacts we had and realized they were something akin to "dice". And they weren't 12k years old. Th

• culi 7mo ago
  > Second, the evidence developed here shows that artifacts exhibiting the diagnostic attributes of historic Native American dice appear in archaeological assemblages from diverse groups throughout all periods of North American prehistory—from the Late Pleistocene / Early Holocene (aka the Paleoindian period), around 13,000–8000 years before the present (BP); through the Middle Holocene (aka the Archaic period), around 8000–2000 BP; and into the Late Holocene (aka the Late Prehistoric period), around 2000–450 BP https://www.cambridge.org/core/journals/american-antiquity/article/probability-in-the-pleistocene-origins-and-antiquity-of-native-american-dice-games-of-chance-and-gambling/E38C7B1F4CE7F417D8EFAC5AFEEF20A2 https://www.cambridge.org/core/journals/american-antiquity/a...