Cephalopods from Rockford Limestone Indiana

[svcgoat]

These two cephalopods I recently purchased are from the Mississippian age Rockford Limestone in Indiana. Any way to ID these?

[Ludwigia]

Research the fauna of the location and formation.

[svcgoat]

38 minutes ago, Ludwigia said:

Research the fauna of the location and formation.

I tried but the article was pay walled maybe I was doing it wrong 

[doushantuo]

might be Manticoceras.

In all honesty: that answer was superficially researched, so wait for a second opinion

the goniatite depictions in Gutschick and Treckmann(1957, journal of paleontology )are non-informative black splotches

see if you recognize your morphotype among some more or less coeval ones

Miller/Garner : Lower Missisippian cephalopods of Michigan

ID133.pdf

Edited November 27, 2024 by doushantuo

[svcgoat]

Thanks for your help

[svcgoat]

Wait I think I this paper is the wrong biota it's not from Indiana 

[piranha]

Muensteroceras parallelum

 

 

Treatise on Invertebrate Paleontology – Part L Mollusca 4 Revised Vol. 2:

Carboniferous and Permian Ammonoidea (Goniatitida and Prolecanitida)

[Manticocerasman]

On 11/27/2024 at 10:22 AM, doushantuo said:

might be Manticoceras.

In all honesty: that answer was superficially researched, so wait for a second opinion

the goniatite depictions in Gutschick and Treckmann(1957, journal of paleontology )are non-informative black splotches

see if you recognize your morphotype among some more or less coeval ones

Miller/Garner : Lower Missisippian cephalopods of Michigan

ID133.pdf 4.05 MB · 1 download

Not Manticoceras. All the Gephuroceratids (which include Manticoceras ) went extinct at the end of the Frasnian.

But the suture lines are indeed very similar.

So I'll go with "Piranha" on this one.