The lady in this picture in the link below claims there are 30 such sinkholes on her ranch.
https://bloximages.chicago2.vip.townnews.com/enidnews.com/content/tncms/assets/v3/editorial/0/68/068a0d7f-8403-5a1f-b9d4-6b82e6b8667f/5a2dc3b31ac7c.image.jpg The ranch is down the road from Alabaster Caverns State Park. I assume cavers have worked this area. I want to go see that cave again, but don't want to go without my kid, and getting my kid to go that far in a car is impossible. ( I actually tried this past summer and we got as far as Norman, Oklahoma ) David Locklear
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