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Stained what colour, Bruce? One possibility is that this is from a deposit that has undergone a recent change of pore water/gas, altering the mineralisation of the external surface. The endosteal surface, being somewhat isolated from the surrounding sediment, may have reacted more slowly and retained its former condition. But that's a real speculation! Terry Terry O'Connor NB new email address [log in to unmask] [log in to unmask] will shortly cease to operate Professor of Archaeological Science Department of Archaeology, University of York Biology S Block, Heslington, York YO10 5DD +44-1943-328619 http://www.york.ac.uk/archaeology/staff/academic-staff/terry-oconnor/ On 18 July 2012 17:50, Bruce L. Manzano <[log in to unmask]> wrote: > Hello! This stained bone questions is very interesting. I have one bone > fragment from a historic site in Mississippi that appears stained on the > internal bone. The outer and inner surfaces do not show the stain except > possibly as small dots scattered on the surface. I wonder if such a > pattern occurs with the stained bones being discussed? Thanks for your > replies! > > Bruce L. Manzano > Program for Archaeological Research > University of Kentucky > Lexington, Kentucky 40506 > [log in to unmask] >