A lot might depend on whether fire was used for preservation, or even just drying. Esquimos dry fish, any tribe living on a river with periodic great abundance of fish like salmon in the northwest, or herring and shad on the Chesapeake Bay and Potomac could have had fish weirs, nets, enclosures, etc., none of which would preserve over hundreds of thousands of years or even tens of thousands. With a guaranteed supply of preservable food as well as regularly available plant and flesh food, settlements might have been rebuilt over centuries or millenia. This may be one reason there have been interesting finds tens of thousands year old along the Danube, also older than expected finds along the Potomac.
Palaeolithic / Paleolithic European, Russian and Australian Archaeology / Archeology Sites
http://donsmaps.com/indexsites.html
fyi
Our next couple of GGG topics, soon, and sooner if someone else does it first. :’)
Earliest Known Stone Tools Planted the Seeds of Communication and Language
http://popular-archaeology.com/issue/winter-01012015/article/earliest-known-stone-tools-planted-the-seeds-of-communication-and-language
Yabba dabba d’oh! Stone Age man wasn’t necessarily more advanced than the Neanderthals
http://www.eurekalert.org/pub_releases/2015-01/uom-ydd011415.php