sol 102 34 minutes changes - reduced to less than 2 seconds - of soil freshly piled on a WCL hopper.

You don't want to know what I think I am seeing.
Er, watch closely the soil on the bottom left side of the pile.
Here is a sol 102 3D that I think shows some decidedly darker ( grey?) soil in the latest trench. Looks like a Hearty Soup to me. Soup for you! Soup for everybody!
dx, why don't you look at this "best focus" montage very slowly, scanning left to right, top to bottom. Do it several times. Then do it again. Take a break. Come back and do it again. And again. Walk the dog. Play your violin.
If you haven't found the "rings" ( mmmm, doughnuts! ) after an hour I will consider spending an hour that I would rather devote to creating more images highlighting what I find inderesting.