Coiled Marine Mollusks from the Upper Pennsylavanian Brownwood, TX

[Jeffrey P]

Here are two coiled marine mollusks from an Upper Pennsylvanian site near Brownwood, Texas I collected in September. Not sure if these are gastropods, goniatites, or nautiloids. Two views of the first one and three views of the second. Thanks for any help with the IDs. 

[The Amateur Paleontologist]

Nice mollusc fossils you found  I'm positive that the second specimen is definitely a gastropod.

-Christian

[Heteromorph]

@BobWill

[Scylla]

Nautilus I think because of the chambers without complex sutures. Very cute!

[Herb]

they look like bellerophontid gastropods to me

[BobWill]

I would need a profile view of the first one as well as a look at how those grooves look going around the venter.

 

For the second one I don't know of a nautiloid with septa or sutures that straight. Most have a slight curve to them so that may just be unusual wear. If so it could be a gastropod like Euphemites vittatus with those concentric ridges but it could also be a nautiloid like Liroceras liratum which has similar ornamentation on the early whorls.

[Scylla]

High resolution CT scan to look for a siphuncle?