1st mazon creek concretion... plant?

[RandyB]

Not the most exciting start to my 1st mazon creek freeze/thaw attempt, but at least its not blank. I am guessing some kind of plant material

 

[connorp]

Might be plant fragments. Those super 3D impressions are common in concretions with many layers, but they usually don't look like anything. I'd keep splitting both halves.