A study, by Christopher Ellis,  of Debert style fluted points from the Debert Site in Nova Scotia and a comparison with other fluted point styles in the Northeast. From the Journal of Canadian Archaeology(2004).
http://anthropology.uwo.ca/cje/Publi...d%20Points.pdf
From the above article, this highly illustrative demonstration of the changing morphology of fluted points as a result of tip resharpening and rebasing: