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MSirmon

I think the first picture is collapsed Calamites and the second 2 are part of the offshoot of a calamites. Not sure about the spelling but know itwas a type of cat tail. These were found in Southeast Oklahoma near Wister Lake. The area is Pennsylvanian. 

651B6F32-4548-492D-B284-801D37469E96.jpeg

EFD3D155-4BD3-49F5-AE94-F7A04F30E0B2.jpeg

490B41FF-135F-4971-BC94-95C21207AB95.jpeg

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abyssunder

Calamites (not Calamides) is the correct name, and I think the first specimen is that.

Don't know what might be the second specimen.

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Rockwood

The first one might not look like what comes up in an image search for calamites. The most common fossils of these are pith casts. This is an external mold. The nodes and ridges of conductive tissue are not as pronounced on the outside.

The second one may be a branching point in a pith cast, but it's hard to say for sure.

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