Kutoyis

"Kutoyis, also known as the Two Medicine Bison Jump Site, is located in the Blackfeet Indian Reservation, Glacier County, Montana. Kutoyis is a vast complex of rock features and bone scatters ..."
http://www.u.arizona.edu/~mzedeno/research.html

Above: snake effigy

See also: http://www.az-arch-and-hist.org/2012/06/effluent-foragers-conservation-and-research-at-the-murray-springs-clovis-site-jesse-ballenger/

http://archaeologynewsnetwork.blogspot.com/2011/08/new-technologies-reconstruct-ancient.html?m=0#.UNHxvOQ8B8E