Spheroolithidae

Spheroolithidae; Temporal range: Early – Late Cretaceous; ~136–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Spheroolithus eggs from China
Egg fossil classification
Basic shell type:	†Dinosauroid-spherulitic
Oofamily:	†Spheroolithidae
Oogenera
	†Guegoolithus; †Spheroolithus; †Paraspheroolithus

Spheroolithidae is an oofamily of dinosaur eggs. It contains Guegoolithus, Spheroolithus, and Paraspheroolithus.^[1] Like modern birds, the eggshell membrane formed before the calcareous part of the shell.^[2]

References

Spheroolithidae Temporal range: Early – Late Cretaceous ~136–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N

Spheroolithus eggs from China
Egg fossil classification
Basic shell type:	†Dinosauroid-spherulitic
Oofamily:	†Spheroolithidae
Oogenera
†Guegoolithus †Spheroolithus †Paraspheroolithus