Unknown marine organism from Anshun

[Crazyhen]

Any idea what kind of fossil is this?  It’s from Anshun of Guizhou.

[indominus rex]

May we have better images? To me it looks a bit like a turtle carapace, but I'm no expert on Chinese fossils.

[Fossildude19]

Looks like a phyllocarid carapace, to me. 

Not seeing anything remotely turtie-ish at all.

 

[indominus rex]

11 minutes ago, Fossildude19 said:

Looks like a phyllocarid carapace, to me. 

Not seeing anything remotely turtie-ish at all.

 

Well I guess the shape? Actually yeah it lacks the texture of a turtle shell, my bad.

[caldigger]

There is also an ammonite imprint just to the upper right, which gives an indication of age.

[Spongy Joe]

Mrs. Spongy has a good suggestion: a piece of a large broken ammonite, looking at a septum. I reckon it makes sense, but then I have to say that.

[andreas]

 

4 hours ago, caldigger said:

There is also an ammonite imprint just to the upper right, which gives an indication of age.

Age should be Triassic Carnian stage. The ribbed ammonoid above looks like a Trachyceras species. The unknown part/fossil could be as said above a shell part of a big ammonoid. Joannites sp. or Carnites  are possible smooth shelled ammonoids of that timespan.