by Larry Hatch
(Smithville, Oklahoma)
Found at Lake Whitney, Texas
Comments for What is it
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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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