Human DNA found in a coprolite is the oldest dated in North or South America dating somewhere around 14,000 years ago.  The samples were found in Paisley Five Mile Point Cave. 

Paisley Caves

The Paisley Caves complex is a system of four caves in an arid, desolate region of south-central Oregon, United States. One of the caves may contain archaeological evidence of the oldest definitively-dated human presence in North America. The site was first studied by archeologists in the 1930s. Scientific excavations since 2002 have uncovered substantial new discoveries.

• http://en.wikipedia.org/wiki/Paisley Caves
• Page 214 - Kelly, R. L. and Thomas, D. H., 2017, Archaeology, 7th edition, Cengage Learning, 402p.