The Forest Ratio

I saw this fossil-like object on a tree log when I was walking through the forest on Parkinsel, a small island located in Ludwigshafen, Germany.

 

It looks pretty interesting, Maybe it's a seashell? If you guys have any idea post it in the comments please!

 

Shot with Olympus OM-10 Mark iv + M.Zuiko Digital 45mm f1.8

 

Edited in Lightroom

Done