strata markers Meadowcroft Rock Shelter Paleo Indian Pennsylvania archaeological site Native American prehistoric pre historic

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strata markers Meadowcroft Rock Shelter Paleo Indian Pennsylvania archaeological site Native American prehistoric pre historic usa united states archaeology dig historical

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Photo credit: © Tom Uhlman / Alamy / Afripics
License: Licensed
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Keywords: american, archaeological, archaeology, dig, historic, historical, ind, indian, markers, meadowcroft, native, paleo, pennsylvania, pre, prehistoric, rock, shelter, site, states, strata, united, usa