Strange rock formation

[Emersonpaz]

I was detecting the edge of a river and I found this stone by chance as it is not detectable with a detector, it has a broken shell on top exposing its interior. I decided to record this video after washing there, has anyone seen anything similar?

https://youtube.com/shorts/XlXqIYhAw1o?si=F1W-Ybv0nHVg27ke

[Tanu]

I was detecting the edge of a river and I found this stone by chance as it is not detectable with a detector, it has a broken shell on top exposing its interior. I decided to record this video after washing there, has anyone seen anything similar?
https://youtube.com/shorts/XlXqIYhAw...W-Ybv0nHVg27ke

What detector do you use?

[Carl-NC]

Off-hand, it looks like a dinosaur egg.

[Emersonpaz]

What detector do you use?

was using the classic Polish pi

[Emersonpaz]

Off-hand, it looks like a dinosaur egg.

Thanks for your opinion Carl, I had that impression too. On these occasions I would like to understand more about geology. Our region suffered a huge flood that ended up eroding the riverbed and exposing different rocks.