Any ideas?

[CDavison]

Found these in the same river about a quarter mile apart. What are the odds of good old mother nature making 2 just alike but one smaller?

 

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Agony and Death on a Gold Rush Steamer: The Disastrous Sinking of the Side-Wheeler Yankee Blade - Grab it through Amazon!

[bowwinkles]

Some of these primitive fire starters used a stone as a bearing held in your hand at the top and some had stone bearings both top and bottom.

https://duckduckgo.com/?q=fire+starter+string+and+bow&t=h_&iax=images&ia=images

 

[Indian Steve]

Sorry naturals.