Found a Different Type of Rockpile

Not sure what to make of this type of rockpile. I found a couple of examples along a stretch off of Decker Avenue that looks down into the valley - that is chalked full of rockpiles and a couple of very large trees.

I'm not sure if the center of the examples I have run across seem to be filled with earth. But I say that only because it looks like this visually. For all I know they could be made up of more stone. I didn't poke anything down into it to test it out.

With the next two pictures - those aren't orbs (at least I hope not). It's been snowing off and on this afternoon, which makes a major change from yesterday when it was 77 degrees and sunny.