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 Interesting, my guess was fungal activity but the near perfect circle threw me. It's about 6 feet in diameter. We have had quite a bit if rain of late so it makes sense. 
 (again chatgpt) it's because fungal mycelium typically grows outward from a central point in a circular pattern as it searches for nutrients 
 I've got to start using chatgpt. I've used it before, but simply forget about it. I need to ask chatgpt what is a good way to not forget about chatgpt! 
 I use it for work all the time so it's a pinned tab and has become my go to over regular search engines. It's like a very well educated but somewhat naive and mischievous assistant 😄