WHAT MADE THE MARKS IN THIS ROCK?! IS IT ANCIENT WRITING?!

[solo95502]

I found this large rock in an abandoned garden, just north of Crescent City, California.
Can anyone tell me what it is and what made those marks?
The rock is approximately as big as a platter, and the marks go all the way around the rock in by a complete circle.
Thank you!

 

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[solo95502]

I quarried a rock somewhat similar from a mountain not too far from your location.
Been curious about it, ever since.

1) Any chance of getting focused pictures in natural, outdoor lighting ?
2) Can't make out the colors from your pictures, ... are there hints of "brownish-gold" coloring throughout the rock ?
3) If you run a piece of sandpaper along the seam, does it almost take on a metallic look, ... yet, it doesn't exactly look like metal ... just a hint of a metallic look compared to the rest of the rock?

I've had mine examined by some very knowledgeable people and am still looking for an explanation on what, and how this was formed.

I can vouch that it is entirely natural, nothing to do with human alteration, and that the "stitched bands" do run in a flat, consistent plane through the rock.

Hoping to see some clear pictures and hear folks theories on how this formation could have occurred.

I wish I could... Someone stole the rock.

 

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[Blackfoot58]

I found this near a creek yesterday.
It is similar to your original posted photo. This one is only about 1” long though.
I assume it to be a fossil, but I don’t know what it derived from.
The creek site is in Iowa.