Coral or nautiloid?

[PaleoOrdo]

I posted a picture 2 weeks ago of a fossil which it was disagreement about what it is.

 

 

 

 

In the same stone I found several fossils which have the same or similar forms. I therefore ask again for opinions. First the same picture:

 

[PaleoOrdo]

Here is another from the same stone. In this picture is also a strange bone-like structure which I not know what it is.

[PaleoOrdo]

Two more pictures from the same stone

 

[PaleoOrdo]

Finally, here is several of the same

 

[TqB]

Very interesting images, but we really need a scale here!

Edited September 13, 2020 by TqB

[michele 1937]

I don't see Nautilus

[Darktooth]

They remind me of a cross section of ammonites.

[FossilDAWG]

I believe these are cross-sections of bryozoans, with the exception of the long flat structure made up of tubes in the second photo.  That one is intriguing, it might be a gastropod but if so it is exceptionally thin.

 

Don

[PaleoOrdo]

Thank you all for your interesting viewpoints. I will now post more pictures with scale, some is the same others new of the same stone and of another stone found same place. It is a late middle to late ordovicium site in Norway. As you know the coin's diameter is 19,5 mm or almost 2 cm, so they are small creatures. But I came to realize that the small fossils are sometimes more interesting than the big ones. Here is the first 2 pictures. 

[PaleoOrdo]

The next pictures, the form of the speciemen 'scaled 4' is about 1 cm and quite clear, while 'scaled 5' have a graptolite?

[PaleoOrdo]

The next 'scaled 6' I think have an nautiloid in the left side, but I m not sure what is the "nautiloid.like" form in the middle below. Next, 'scaled 7' 

 

[TqB]

I agree with Don @FossilDAWG that most of these look like bryozoan sections. I'm not seeing a graptolite, which wouldn't appear like that in section like this.

The segmented pieces similar to straight nautiloid look like crinoid fragments.

 

Thank you for the new photos - it doesn't matter too much here, but it's also useful to know the diameter of the coin!  

 

Edited September 13, 2020 by TqB

[PaleoOrdo]

Next, 'scaled 8' the same "double fish" which I posted in the beginning, now for scale, it has also som ecorals, while 'scaled 9' have the same species as several of the former pictures.

[PaleoOrdo]

Maybe you are right about the bryozoan-forms, Don. I read from Professor Abby Smith, from the University of Otago that "at the level of the individual, they do look like an animal. They are a little worm with a nose that has tentacles round the outside...". Is it possible that we see those tentacles in the first picture above, or would the tentacles not be preserved? Are there any littearure or picture of ther speciemens of bryozoans similar to the ones I found?

Still, it remains to be answered what are the fossils in picture number 3 in the beginning above. They still look like nautiloids to me. Also the flat structure made of tubes (you mean the white "bone structure" Don?) in the second picture is strange, but doesent look like a gastropod. 

Martin

 

[PaleoOrdo]

I also have enlarged 2 of the fossils in picture 7 and 8. The first one seems to have same form as the bryozon-forms (if we all agree they are brozoans) but it has a different conic structure below it. Could it be something else than the bryozoans? A brozoan is a coloni-animal and cannot have a seperate "house"? The second one seems like a nautiloid, maybe 1 cm long more or less, the structure continues above an intusion.

[PaleoOrdo]

At least this fossil, enlarged from picture 3, should be a nautiloid, because a crinoid fragment can hardly be bended like this one. 

[PaleoOrdo]

The other fossil is picture 3 must be a different species of bryozoan than the orher bryozoans, because it has a screw-shape. According to earthsci.org screw-shaped forms mostly are Archimedes species of Bryozoan. This form is seen in my speciemen: