According to our current theories these folks should not be further east than the Minnesota short-grass prairies, and yet we see hints of them near the St. Croix....
Plains atlatl point styles like Pelican Lake, Oxbow and Besant,etc., and made of Minnesota stone materials have been found in Dunn and Pierce Counties by Dan Wendt.
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Lifted from the Wisconsin Archeological Artifacts group on FB.
Posted by Ryan J. Howell
Plains Archaic in NW Wisconsin?
Traditionally almost all Wisconsin archaeology falls within the "Eastern Woodlands" and "Great Lakes" archaeological sequences/timelines.
But in NW Wisconsin we are starting to see hints of the Plains Archaic bison hunters of 5000-500 B.C.
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Obsidian artifacts unearthed in Alberta offer new clues on prehistoric trade routes
https://www.cbc.ca/news/canada/edmonton/alberta-obsidian-research-1.7495831
Tools of volcanic rock provide clues on how Indigenous peoples shared the landscape
🇨🇦 🇺🇲
#Indigenous #IndigenousHistory #archaeology #prehistory #TradeRoutes #obsidian
Hand-carved arrowheads and jagged spears made of obsidian, a sharp rock formed by volcanic magma, are remnants of vast prehistoric trade networks that once cut across western North America. New research is shedding light on the artifacts unearthed in Alberta.
Glass forms when a liquid is fast cooled preventing crystallization, across a reversible process known as the glass transition. Organic tissues are commonly preserved as glass by processes of vitrification at very low temperatures, known as cryopreservation, and can return to their original soft state when heated back to ambient temperature. It would therefore be impossible to find organic glass embedded in volcanic deposits that have reached several hundred of Celsius degrees. Here we demonstrate that material with glassy appearance found within the skull of a seemingly male human body entombed within the hot pyroclastic flow deposits of the 79 CE Vesuvius eruption formed by a unique process of vitrification of his brain at very high temperature, and is the only such occurrence on Earth. Calorimetric analyses show that the temperature at which the brain transformed into glass was well above 510 °C, implying that the body was exposed to the passage and vanishing of a short-lived, dilute and much hotter pyroclastic flow, explaining its early fast heating and the following very fast cooling. The glass that formed as a result of such a unique process attained a perfect state of preservation of the brain and its microstructures.
Victoria Stuart 🇨🇦 🏳️⚧️