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Thanks iowa trout! I and the owner of the site both have cones we found there. They are what I would call traditional cones that are basically half of a sphere.
This is piece is nothing like them.
I had one well versed guy at collinsville at first look instantly say to me "arikara" "Sinew Stone" said he had seen something just like it in the past. I don't know that they were this far east, but they weren't to far north and west. So I don't necessarily think it's from the Arikara people, I do think he may be right about sinew stone though.
Since it shows a superficial resemblance to a fossil echinoid, I also googled "weathered echinoid fossil" for the heck of it. I doubt that's the answer, but you might find examples down the page where you might see why the thought came to mind in the first place....
https://www.google.com/search?q=wea...KEwji14WbuLbKAhVQ7GMKHTNECVsQ_AUICCgC#imgrc=_
Thanks or the thoughtful reply Charl! I looked online and read a few things about these stones, and saw some examples. Some I didn't agree were properly identified.
Anyway, this piece exhibits a high degree of polish, top and bottom. One end is flat, the other has a crown. The grooves around the sides are not smooth from use as one would expect, so in my humble opinion they were put there for grip. Maybe they were working greasy hides and needed the rough edge.
One of these days I will run down the archy at the local college and see what he has to say.
Thanks, quito. Used as grips as you describe seems logical. And here's one of those sinew stones I referred to, found in RI recently. Shows use as a hammer on one side...
This one has been discovered as being a club head type but still it was something I wondered about for a while.
Pretty neat rock, it kinda has the shape of a hoe, but it's hard to tell how thick it is?