17 July 2023

Interesting rocks


Posted at the What's This Rock subreddit, with relevant discussion of septarian nodules, turtle stones etc scattered in the comment thread. See also here.  

This is an often-interesting subreddit, BTW.  Here's another recent offering, of a rock found in the UK, with a serrate-edged hole through it. 


See if you can figure it out the morphogenesis before seeing the answer in the discussion here

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