I beleive these are cores. One is a part of something that has been worked but broken off.
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That's how it is now -- how was it a thousand years ago? Creeks and rivers that were very active when I was a kid have shrunk quite a bit now, and that's just from fifty years of "development" in the area.This creek can get some high flow if we get a lot of rain, but the creek is dry most of the year.