Fossil identification from Indiana

[Kcjr35]

Looking for help identifying fossils I was given 35 years ago that was found in Indiana. 

[val horn]

it looks like several large vertebrae, but I would like a close up photo to see actual bone stucture-- an area where the internal bone is exposed would help me to know that it is not a copy or a rock look alike.  If it is bone it is huge.

[Kcjr35]

There was 5 pieces found and split between family. It has been in my family since 1950. I’m almost certain this is petrified. It’s very heavy. 

[Kcjr35]

Ends 

[JohnJ]

More photos in sunlight could be useful.  A couple of close ups of the broken end texture would help, too.  Thanks.

 

[val horn]

the ends are disappointing to me because I dont see anything that looks like bone.  It should look something like a soup bone with meshwork through the center.  I would consider taking it to be seen by state university geology or paleontologist .  i am showing you someones piece of a vertebrae and piece of dino bone for sale where you see what internal surface I am expecting

[Harry Pristis]

Well . . . There are no dinosaurs to be found in Indiana -- rocks there are too early for dinosaurs.  And, much too early for whales.  These palaeozoic rocks are predominantly marine in origin.  Possibly, it's wood, totally replaced wood.  This would have to be washed in from the North.  Could be a Pennsylvanian sphenopsid like Bowmanites.