Are these fish ribs in a phosphatic nodule? Contains some very interesting rounded structures ( Missouri )

[Samurai]

Location: Missouri

Period: Pennsylvanian

Formation: Iola Limestone (Muncie Creek Shale Member) 

 

Hello! I have happened to come across a strange structure while attempting to retrieve a fossil from a limestone rock. While breaking the stone around this nodule the force was enough to separate 2/3rds of the fossil leaving the other section still in a massive slab of limestone that will need more time to dig out

 

 

Nevertheless here is the structure in question

Rotated: 

 

 

 

 

 

1 of the 2 pieces I was able to retrieve and contains the round "ball structures":

I will note I have seen the odd "ball" pattern once before from a post I made over a year ago and I was unable to get it properly identified beyond it possibly being fish ribs/support structures or something else, but I'm hoping this new perspective will help nail down this mystery. 

 

 

 

I decided to retake some of my original photos since my old device was restricted in file/image size

 

 

 

 

Edited December 2, 2021 by Samurai