Shark Egg Palaeoxyris

This is a fossil shark egg Paleoxyris spec.
The specimen dates back to the Upper Carboniferous – more precisely, the Pennsylvanian – of Grundy County, 
Illinois, USA. It is approximately 320 million years old.

The egg shown nice details, it measures approximately 5 cm. The stone is original and unbroken, measuring 
approximately 9 x 5 x 2 cm.
There are also parts remains on the stone. Sharks have "glued" their eggs to plants.

Interesting and rare!

No tampering whatsoever!