And what fabulous history even including the family that spent 40+ years in collecting.
The preponderous amount of artifacts seem bone & horn utencils. In TX we are lucky to find the "occasional" bone awl.!!
We recently covered how some bone can survive so long in the ground....some of those tools look like new.
Lots of aditional info on Google just under " ARIKARA INDIANS " a site by tribal people that are still viable today.
Big contact with Lewis & Clark and many were killed along with Custer as part of his contingent.