Bone fragment of some sort?

[pseudechisbutleri]

I found this fossil at the Molecap Greensand Formation in Western Australia. It's a Late Cretaceous coastal marine deposit, mostly marine invertebrate fossils there, shark teeth too. Sometimes marine reptile fossils and there's also been a couple of dinosaur bone fragments found, plus a pterosaur jaw fragment.

 

I visited there in search of shark teeth, unfortunately I didn't find any but I did find whatever this is. Maybe a bone fragment of some sort? A rib fragment maybe?

[Rockwood]

I think this is a steinkern, perhaps from a tube worm. You should wait for other opinions however.

[Seaspawn]

It's so perfectly round when viewed from the angle in your last pic, I'm really interested to see what people say about this one. Nice find, whatever it is.

[Scylla]

Does not look like bone. Might be a burrow infill

[Rockwood]

8 minutes ago, Scylla said:

Might be a burrow infill

Some are lined. It would also tend to explain the geometric perfection.

One should keep in mind that Pterosaur bones could leave internal molds that are very cylindrical. Such an ID is over my head though.

[pseudechisbutleri]

21 hours ago, Rockwood said:

Some are lined. It would also tend to explain the geometric perfection.

One should keep in mind that Pterosaur bones could leave internal molds that are very cylindrical. Such an ID is over my head though.

That would be awesome, if it was actually part of a pterosaur fossil. Unlikely, seeing as how there's been so few pterosaur fossils in Australia, but still a neat hypothetical.

 

21 hours ago, Scylla said:

Does not look like bone. Might be a burrow infill

 

21 hours ago, Rockwood said:

I think this is a steinkern, perhaps from a tube worm. You should wait for other opinions however.

How does one ascertain if this is the case?

 

21 hours ago, Seaspawn said:

It's so perfectly round when viewed from the angle in your last pic, I'm really interested to see what people say about this one. Nice find, whatever it is.

Thanks! Hopefully I can get this thing ID'd eventually.

[Rockwood]

14 minutes ago, pseudechisbutleri said:

Thanks! Hopefully I can get this thing ID'd eventually.

It's the sort of thing where more local help is likely to be needed. A museum, or fossil club would be good places to start.