Fossils: Palaeoxyris (Shark Egg Case)
Age: Pennsylvanian (Upper Carboniferous)
Location: Illinois (Mazon Creek)
This is a good large example of a classic fossil from Mazon Creek. Shark egg cases are not rare, but good quality and large ones are less common. This is a textbook example, so do not miss out.
Only one side of the nodule. The nodule is unbroken, it measures about 10 x 8 cm. The egg is quite big, it measures about 8 cm in length.
No manipulations!
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