by Michelle and Pierre
(Western S. Dakota)
Michelle found this at a near by lake. It was imbedded in soft rock with other small fossiles
Comments for We are not sure. I think possibly an egg ?
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Geologic Time Geologic Time Line
Cenozoic Era
Quaternary
Neogene
Paleogene
Mesozoic Era
Cretaceous
Jurassic
Triassic
Paleozoic Era
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
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