River made or man made

Chuck317

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All Treasure Hunting
20200928_141920.webp20200928_141952.webp20200928_141945.webp
 

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I'd say they're all naturally occurring rock formations, except for #3 as VTH already mentioned, likely bone.
 

It is, I can't tell if it's been weathered by the river or if it is a native artifact
 

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