Horsetail? Maybe a leaf on the other side

[Carboniferousjim]

Hello again,

After poking around in the shale and stone at the side of a nearby river bank, practicing splitting different rocks, I came across this piece.

 

I know it’s really rough and in comparison to the fronds and plant fossils I’ve seen on this site it’s probably worthy of the scrap heap but regardless I’m really happy if it turns out to be real and not just a rock!

 

so first side and the first 3 pics I believe is Calamites, I apologise for the lighting I am going to get a proper table for photography purposes. 
on the reverse side, I believe there are multiple Neuropteris leaves?

Theres also another more fan shaped leaf with lovely venation that I haven’t been able to hazard a guess at?

I was going to attempt to prep the side  with the (potential leaves) with a cotton Budd and a needle. Does anyone have any tips on cleaning solutions or what not to use, I know it may seem like it’s not worth it to the professionals out there but I think it’s cool!

 

Thanks for any advice dudes!

[Rockwood]

The first one does look like the internal side of a Calamites stem.