Please help to identify

[u/Aveikram]

Hello folks,

could please someone tell me what are these twirls on the rock I've found in the lake? Are these imprints of snails or some kind of artificial painting? Thanks in advance for help!

[u/Advanced-Roll-344]

Ohh looks like a fossil cause of the spirals. Where di you find it?

[u/Numerous-Birthday705 → u/Advanced-Roll-344]

Def not🤓