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Sorry, can't answer your question. Quick correction though, uranium is the highest atomic number that occurs nationally.
Edit: so I'm wrong about this. In school we learned that it was uranium and that's also what it said when I checked sources, but not enough. Apologies.
Naturally*
, my dear Watson
Trace amounts of plutonium occur naturally.
The Oklo natural nuclear reactor has naturally occurring plutonium and neptunium