These photos are all copyrighted, so I can't post one, but you might like to take a look at these artifacts from The Portland Basin near Vancouver WA.
I find these extremely interesting, and mysterious.
THESE ARTIFACTS ARE SOME TIMES CALLED "SHOTO CLAY" OF THE PORTLAND BASIN, LAKE VANCOUVER, OR THE LOWER COLUMBIA RIVER.
ALL PART OF THE PRIVATE MUSEUM OF ANCIENT PEOPLES OF THE COLUMBIA RIVER AND GREAT BASIN.
A private collection I guess, but will open for public upon reasonable request.
I've written.. I have to see these, any body else want to go?