I found this in my back yard on the Eastern End of Long Island in NY.
Can anyone tell me what it might be?
Can anyone tell me what it might be?
Banded rock with thin, weak layers between thicker, stronger ones.
As this rock has aged, the weak layers break down.
The cleavage, as seen, follows the bend of the weak layers.
The inside curve is one of these weak points that has shed smaller versions,
The outside curve was actually the inside curve of the larger piece from which this one was shed.
This rock didn't need man to become like this.
It naturally breaks down into smaller versions of itself.
That's how this rock rolls.