Fossil ID help: Brachiopod, Crinoid Stems, Dolphin tooth, Orthocone Nautiloid

[Praefectus]

Hello. I'm working on organizing my collection and was wondering if anyone could help me with some identifications. Thanks for any help. 

 

I don't have any info on this one. I think it is a Mucrospirifer brachiopod. Can someone confirm this? Help with the species name would be appreciated. Thanks. 

 

These are crinoid stems. I don't have any further information. Does anyone know the species, where they came from, or the approximate age? Thanks. 

 

 

I think this is a dolphin tooth. It was found on the Ernst Ranch in Bakersfield, California. Can anyone help me identify it further? Thanks. 

 

 

Last, here are some fossils I collected when I was young. They were found near Thermopolis, Wyoming. They were found on one of the paleontology digs that the local museum hosts. I think they are orthoconic nautiloids, but I am not sure. 6 year old me was not taking good notes. Thanks for any ID help. 

[ClearLake]

Yes, that looks like a Mucrospirifer, but need to see the hinge line (big or little interarea?) to help be more certain.  Without an age or location, ID to species will be a bit tougher, but someone may have a good idea.

 

Crinoid stems, yep.  Saying much more than that without knowing an age is likely impossible.  They look old, probably Paleozoic.  

 

Can't help with the tooth, it is neat looking though.

 

Those look more like belemnites to me, or at least some of them do.

[Praefectus]

Thanks for the help! I took a few more pictures of the brachiopod (sorry, I don't know what a hinge line is). Let me know if you need more pictures. 

 

[ClearLake]

Yes, those pictures help.  You captured the hinge line in your first new picture.  That is the straight part of this shell and represents the junction of the two shell halves, where it opened and closed.  The interarea (flat area next to the hinges on each valve) is narrow which makes me more confident that it is a Mucrospirrifer.  Mucrospirifer mucronatus is a common species from the Devonian of North America and fits most of the features that I can see here, but there are lots of species of Mucrospirifer and some are quite similar so you are probably better off just labeling it Mucrospirifer sp. without having any location/age info.   @Tidgy's Dad or @Peat Burns may have an opinion on this one also.

[Tidgy's Dad]

If you're a lumper, rather than a splitter, most (but not all) of the North American Mucrospirifer species have been merged into  M. mucronatus or M. thedfordensis. This one has a flattened fold and flat floor to the sulcus so is likely to be M. mucronatus, in my opinion. 

[PaleoNoel]

Your cephalopod fossils from Wyoming are belemnites, probably Jurassic Sundance formation. I believe the genus Pachyteuthis is supposedly common. At some point i'd like to hunt that formation next time i'm in WY.

[Praefectus]

Thanks for the ID help ClearLake, Tidgy's Dad, and PaleoNoel. 

[Praefectus]

@Boesse Can I have your opinion on the dolphin tooth? Your expertise would be appreciated. Thanks. 

[Boesse]

It's a dolphin tooth! Not much further can be said, since dolphin teeth - especially these single cusped ones - are generally not diagnostic.

[Praefectus]

Thanks for your help. 

[Huntonia]

Cool fossils! Shame we can't get good IDs on those isolated cetacean teeth, that's a nice one.

[Praefectus]

8 minutes ago, Huntonia said:

Cool fossils! Shame we can't get good IDs on those isolated cetacean teeth, that's a nice one.

Thanks.