Paleontica Community

HI. Is there anyone able to determine what it might be?
Found close to a brook, approx. 1-2m deep, nest of stones/fossils of similar shapes.
Diameter 50-70cm.
Lokal. Ukraine
https://iv.pl/image/GISqRSI
https://iv.pl/image/GISqC34
https://iv.pl/image/GISqnN2
https://iv.pl/image/GISqhBY
https://iv.pl/image/GISqE0D

Hey @ukr456ukr, welcome to our forum.

Could you please use the function of our webforum to add photos, in stead of links? Below this "snelle reactie" (=quick response) field you see a button with "Volledige bewerker & voorbeeld" (complete editor and example). If you click on that button, you can also add photographs. Its very easy.

Cheers,
Johan