This artifact is identified as a Native American Double Notched Butterfly Wing Bannerstone. [1, 2]It is crafted from banded slate, a material commonly used for these ceremonial or utilitarian objects. [1, 2]Bannerstones were produced by nomadic hunter-gatherer societies in the eastern half of North America during the Archaic period, roughly between 6000 and 1000 BCE. [1]While their exact function is debated, they are widely thought to have been used as weights on atlatls (spear-throwers) to increase velocity or as symbolic ornaments

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