Unknown Tennessee find

[Packy]

Found in loose material at edge of parking lot in pidgeon forge tn. Rock d says wilhite fm but could be fill from Ordovician in that area. Any info appreciated. Packy 

[C2fossils]

@Darktooth @trilobites_are_awesome @Jaybot

[Isotelus2883]

Illaenid or asaphid pygidium.

[Darktooth]

I have to admit that i am clueless as to what it is. Though I could see it being a pygidium as @Isotelus2883 states.

It looks to have 1 thorax segment attached.

[trilobites_are_awesome]

I'm not a 100% sure but it doesn't look at all like a trilobite, I think it is an internal cast of a brachiopod I can see a hinge.

[Packy]

I thought brachiopod first but those 2 lines are stress cracks I believe. It looks more like a chiton plate but Cambrian does not match. Could be hauled in fill but it appeared it was from the area where the business built.  I could not find a trilobite with similar shape either. Thanks for the help. 

[Jaybot]

Could it possibly be a nautiloid piece?  Something like (but probably not) a Oncocerida?

[Anomotodon]

It also looks like a trilobite pygidium to me, perhaps an isotelid? Very similar to Vogdesia (Isotelus) simplex I find in the Platteville formation.

[doushantuo]

I found this image ( out of copyright) of an illaenid pygidium ( Schmidt's monograph series on the trilobites of the Baltic states )

Note fig. 13a

[Packy]

I spent some time cleaning the fossil. I am sure you all correct it seems to be isotelus. Under it was a spine portion very similar to isotelus in the texture and lines. It actually looks closer to a brachyaspis in shape which has similar spines on cephalon. Anyone havea faunal list for the seiver shale?  Thanks all. Good job.