In the past decade large bipointed bifaces have been recognized as the products of early (23-20,000 years ago) inhabitants of the Eastern Seaboard.  Some have been dredged from the Chesapeake Bay and the continental shelf.  A few have been recovered from primary context associated with a diverse assemblage of tool types including smaller indented/straight base points, scrapers and blade technologies. This combination of tools and technologies most closely resembles Solutrean artifacts found in SW Europe (Basque Country) and date to approximately the same time.  This has led to the proposal that people on the Eastern Seaboard may have originated  from there and eventually developed into the Clovis Culture.  This is known as the Solutrean Hypothesis and is controversial.  I have co-authored a book with Dennis Stanford proposing this hypothesis "Across Atlantic Ice" published by the University of California Press 2012.  For a detaied description of a American Solutrean laurel leaf see (

American Solutrean laurel leaf R1214