Looks like some kind of limestone nodule.
The inside seems to be made of of crinoids stems.
commons.wikimedia.org
commons.wikimedia.org
They fall apart into those little disks.
Looks like some kind of limestone nodule.
The inside seems to be made of of crinoids stems.
commons.wikimedia.org
commons.wikimedia.org
They fall apart into those little disks.
RE: What is this rock?