Agreed; ultimately you're best off checking with a Ranger for the specifics... most of the time as long as you're not digging you can get away with it... however I do know for sure they consider removing any artifacts a crime so if that's the goal it's not worth the risk.
Agreed ask a ranger
I would probably lean towards no since it's State Park. The park service is very finicky about that with $5,000 fines and confiscations, best bet would be to ask a ranger at the station
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