If you take a handful of dirt, say out of a garden where there may be a mixture of sand and clay and silt and soil and other things, and stir it into a jar of water won't it separate into sediments,...
Nope. The material settle to form one single 'layer' grading from the coursest and heaviest material at the bottom to the smallest and lighter material at the top. Separate layers don't form at all.
... and isn't that a rough model for what I'm describing?
And I guess I'd think of them as I think of the other "living fossils" as evidence against the ToE because the changes they show are just variations within the Kind over hundreds of millions of years.
I'm not too sure why you think that the existence of living organisms such as Prokaryotes (also living fossils) today somehow is contrary to the TOE. Could you explain why you think it's evidence against "the ToE"?
Faith. Fill up a flask with water. Add clays and gravels and plant material and whatever. Shake it all up. Put it on a shelf.
The coarsest and heaviest material always settle on the bottom first. The lighter and finest material always settle at the top. In one layer. Grading from coarsest and heaviest at the bottom to the finest and heaviest material settling at the top. The "layer" you get grades from the coarsest and heaviest at the bottom to the finest and lightest at the top...
It really is easy. Anyone can do it. We did it in a physical science class when I was 10 years old. The teacher tried to explain how gravity works.