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I found this near Westmoreland State Park in the Potomac. It seems too well preserved to be a fossil. Clearly a vert, but from what?

Hi, I'm new to this forum and need help. I went arrowhead hunting along the Guadalupe River, Kerr County, Texas. Found a couple of unusual rocks, fossilized clams and some other things. Are these just plain old rocks or are they bones of some animal? The 20' high banks were carved out by flooding. There was lots of flint, got two hand axes, one hammer, three scrapers, broken points and lots of chert. Here's the pics of the two unusual rocks/bones. Help!

Greetings, Would appreciate a little input on what these might be. Unfortunately I have NO information on where they were found and in which formation. I only know that they came out of an old collection of a fossil guy in California. They were given over to a secondhand shop as part of a huge assemblage of specimens, many of which weren't labeled, but they were told they were from a dinosaur. I realize that narrowing things down too far will be impossible due to provenance, but if I could confirm whether a.) these came from a dinosaur, and b.) Which general type (small sauropod? Theropod? etc.). If they turn out not to be dinosaur material, that's fine. I paid very little for them and kind of jumped on them on a whim, on the off-chance that they turn out to be something dinosaur that I could use in my upcoming 'Dinosaur Discovery' lesson plans for work. Here are attached photos below. I tried to snap shots from all angles. Pardon the crappy quality of my phone camera. And thank you in advance for your time and expertise.