Plant Fossil?

[Caroboneferous]

Found this piece next to a deposit of Carboniferous fossils in Kansas City.  
 

It was found next to a shale deposit that had plant fossils.   I’m just curious what it is?  Plant fossil? Something else?

 

pictures attached:

[Rockwood]

I'm afraid this looks like mineral filled cracks that have weathered unevenly to some extent.

[Plantguy]

Yep agree with Rockwood...looks to be some type of limestone/carbonate with the mineral filled cracks...no plants, but could have some invertebrate bits in there....seem to have some very small rectangular and circular cross section bits.

Plant remains are usually/more likely found in non-carbonate type rocks like the shale you pointed out was nearby. 

Regards, Chris 

[Rockwood]

A general rule is that the environment which preserves plant material destroys shell and bone. As with most 'rules' there are exceptions, I'm sure.