The oldest micro fossils are comprised of carbon. This is because they have been in the ground a very long time and it compresses the materials into carbon.
The oldest known fossils are prokaryotic.
Stromatolites.
The oldest humanoid fossils were all found in Africa.
In undisturbed strata, the oldest fossils will be the deepest from the surface.
The oldest known fossils are up to 3.5 billion years old.
The 4th layer of soil >.<
Africa
fish
Microcosm
a dinosaurs tooth
3.5 billion years
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