Good evening everyone!
Few days ago I found this bone fraction on the southern shore of Dusia lake, Lazdijai district, South Lithuania.
The maximum thickness is 6 mm, the thick layers and bone canals are also well visible. There were three times when I noticed very similar bone pieces in fluvial sandstone boulders of Siauliai district (Northern Lithuania) too. By me some limb bone cross sections of theropod dinosaurs look similar but I need professional ID of this bone taxonomy- I am sure it belongs to tetrapod, probably reptile or less likely mammal.
Any opinion will be appreciated!
Best Regards
Domas