Dear Guys,
I recently collected three examples of interesting small bones that have the cavities in the same area, I found them in flint erratics of South Lithuania.
One scientist (Jens Koppka) told be that one time the occasional bird bone in flint was found by his colleagues in Lithuania.
I recenly found the link with very similar shape of bone known as Enantiophoenix in the middle picture of one publication that I share with you now :
https://peerj.com/articles/1032/
Open this link and look for "Comparison of scapulocoracoid between the dromaeosaurid Balaur a