My first fossil prep - what did I find?

[Gareth_]

Hey all, it's been a while since I've been able to get near this forum - a 4 1/2 month old baby will do that though! 

I found this piece in a shop and the price was so good it was worth buying and having a punt at prepping it, what I could initially see was obviously a fish but on a different layer, right near the edge was something else which I have exposed that too. 
The fish looks a lot like Knightia eocaena, I don't have provenance on the specimen but the seller thought it was from Wyoming, which would make sense.

On the lower layer (or upper layer depending on how you hold the matrix) is a mix of......? Help! 

The progress pics aren't fantastic, some were taken at 2 - 2:30am. Prepping is addictive, once you start it is hard to stop

 

Scale is in CM

 

 

 

 

[Tidgy's Dad]

Yes, it looks like a typical Green River Formation Knightia eocaena to me.  

[Randyw]

Yes the bottom one is a knightia the upper mass is another fish but its so badly decayed and fallen apart i don’t know if it will be identifyable.

[Fossildude19]

Last items are disarticulated fish scales and bones.

[Gareth_]

Thank you to those that replied! 
I was 95% sure it was a Knightia (although a bit larger than other specimens I've come across) but the disarticulated fish got me, I learned something and now I think that adds more character to this piece