Cracking siderite nodules

[DE&i]

Have been cracking Carboniferous siderite nodules ( and thumbs ouch ) with Elliot at home that were collected from Doncaster UK.

 

Could anyone tell us what Carboniferous plant this might be please measuring about 7mm.

 

Positive photos

 

 

 

Negative photo

 

 

 

 

 

[Rockwood]

Artisia. Cordiates pith cast.

[doushantuo]

pith

Review of Palaeobotany and Palynology 173 (2012) 1–14

Calamitalean “pith casts” reconsidered
William A. DiMichele, Howard J. Falcon-Lang

about 4.4 Mb, and RECOMMENDED

[Rockwood]

They don't look regular enough to be nodes to me.

[DE&i]

4 hours ago, Rockwood said:

Artisia. Cordiates pith cast.

How incredibly interesting, a pith cast. 

[DE&i]

We opened a few more nodules, not sure as yet regarding their I.D.s.

 

[Rockwood]

Neuropteris 

Pectopteris

Lycopod cones

You should wait for second opinions though.

[Mark Kmiecik]

Cyclopteris?

Alethopteris

Lycopod (cones?)

I am not 100% on the first and third.