Thanks for posting that information. I too, am a
fossil collector/rockhound, this has been bugging me
since I saw the first sphere pic, a couple of days ago.
I've been trying to come up with both, a biological reason, and a geological reason to explain these formations. The matrix that seems to be
"dumping" these spheres onto the sand as it erodes.
It reminded me of stromatolite fossils I had seen before.
As you probably know stromatolite formations are ALSO among the oldest fossils, and they are still being formed to this day by mats of bacteria on
Stromatolites and sponges, living together? hmmm..It happened once before!
On the geological side, I'm thinking volcanic tuff, with with glasslike tektites raining down as the ash also collected.
This is my first post, as I just found this website. Very interesting reading.