Large spine fossil or concretions?

[Ramona]

These photos are of what appears to be a large fossil found in my hometown in Hughes County, Oklahoma.  I have not seen them in person, but I trust the person who posted the photos.  The rock is large and initially looks like a spine, but I know that concretions can be misleading, too.  I am going to reach out to him and try to find out if it was found near a current water source or not, if that helps.  

Thanks!

[val horn]

It is not a spine.  Not sure what it is   At this level of photo i wonder about concrete construction material even  sorry

[Misha]

I don't think this is fossil, looks geological to me.

Could it be something like load casts?

[Rockwood]

It does look as if it had been overloaded. Soft sediment that was deformed when overlain by firmer layers.