How can you date uniface scrapers?

[OntarioArch]

If you don't know the site it came from, how can you date a uniface thumb scraper ? ( or side scraper, or 'trianguloid' scraper etc.).
Similarly, are uniface scrapers known to date as recent as Woodland period? Thanks!

 

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[uniface]

Some places stopped making them very early on (backwater Archaic sites in Montour Co., Pennsylvania). Other places (Dakotas, e.g.) made them into historic times. It would depend on your specific locality/region.

Paleo/Early Archaic scrapers in the northeast, down through Kentucky & west to Indiana are consistently similar. I posted a trainload of threads on such stuff a few months back.

 

[joshuaream]

If you don't know the site it came from, how can you date a uniface thumb scraper ? ( or side scraper, or 'trianguloid' scraper etc.).
Similarly, are uniface scrapers known to date as recent as Woodland period? Thanks!

You can google Paleo End Scraper (PES) and see pretty diagnostic paleo tool. Very similar to much later thumb scrapers, but there are some subtle differences that are discernible once you know what you are looking for.