Ammonoid, also called Ammonite, is any of a group of extinct Cephalopod forms related to the modern-day Pearly Nautilus. They are frequently found as fossils in marine rocks dating from the Devonian Period (began 419 million years ago) to the Cretaceous Period (ended 66 million years ago)!
This listing is for one Ammonite Magnet.
Approximate size 1-1/2" to 2", May be square or round*