North Sulphur River multiple Vertebrate Fossils?

[Alextexas]

Hello, this is a fossil I found in the North Sulphur River near the bridge on 2675. 

 

Since this is my first post, I do not yet know how the structure of my photos and text may appear when I submit this, so if there are any problems with any of this, or if you'd like more photos/information, please let me know. Thanks.

 

I assume these are the bones of a Cretaceous marine vertebrate since I have found mosasaur bones in a matrix that appears identical to this one. Unfortunately, I have been unable to identify any of these pieces of bones. The largest central bone is ~19cm long, and another on the side is ~13cm. Due to the overall shape, it was difficult to take photos of all the various structures that someone here might be able to identify without holding it in my hand. 

 

Thanks again.

 

Also, there are many other fossils I have found that I would like to ask questions about, and since I do not want to spam a ton of individual posts, it seems like it would be better to make a long post that covers many different fossils. Would this be okay, or is it better to keep each post focused on one fossil?