Every year during that particular period of time there was a wet and dry season and the marks of those seasons are still visible in the rings of the rock. These rocks are usually formed in mud. It reminds me of Dendrochronology( the formation of tree rings)

@pamela-fabrick would this be why I find so many on the property? Btw, thank you for answering my questions. Im not new to rock-hounding but am 100% new at knowing what they are.

You’re welcome! It certainly could be if there was a sufficient mud floor during the time it took place. This is the only thing that I’m aware of that would form the rings like that.

@pamela-fabrick I added another photo of a different rock with the same pattern.

The second rock looks more like a concretion. I don’t see rings. They form when chemical precipitation begins around the nucleus in the sediment. Like a mineral grain,and begins to collect. Not an expert though, just a rock hound😊

A rock with holes

nice rock

I am a rock hound. Just wondering what causes this.

@charlotte-pertuset Holes can be secondary and created by weathering. Holes in beach pebbles are created by burrowing mollusk. Primary holes are created simultaneously with the volcanic rock formation because of the gas bubbles trapped during lava solidification. Rocks with natural occurring holes are called Hag stones/ Holy stones and are…[Read more]

you good

I know, Pamela-fabrick is a pro at this👍

I learned much with this post & find. Thank you

Yes! Thank you!

Just a rock 🪨

@pamela-fabrick thank you so much. That helped me out 100% I’m quite new to this app and should have explained my query better. @catherine-fean there’s no such thing as “just a rock”😅

@charlotte-pertuset I’m also a rock hound, so I get it😊 I’m absolutely glad I could help!!

@charlotte-pettiest my nephew was manning this app over the weekend so I apologise for his bluntness! I tend to agree, no such thing as just a rock!! Happy hunting xx

@catherine-fean its all good my friend. Happy hunting to you too

hag stones, awesome find

@selena-mattioli i have shelves of hag stones of various sizes from pea size to dinner plate size. I was curious as to what could have caused this particular rock with sooooo many spots.