Hmmmm...looks like a cross section of wood or rock?
writersideup.com ... You are definitely on the right track! It was a rock!
The last guess sounds plausible - are you going to share the answer?Please come share the photo, at any rate:http://www.image-in-ing.blogspot.com/2014/12/summer-memories.html
NC Sue ... Yep! It was a rock! Thanks for the link. I will check it out.
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