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In response to "no wait, it's a thrilling talk on cataloguing rocks that other people rubbed together. it might be interesting? -- nm" by mafic

Actually I think we pay more attention to the sourcing of projectile point material.

We know there are ceremonial blades here in SoCal that originated in Southern Oregon but we've (my gang) also visited a site on the Colorado River where material was quarried and transported west for use as grinding tools.

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