Fossil Id Help Surface Find Texas

[BIEN12]

Went Canoeing with a friend of mine this weekend and came across of the following on a sandbar. Any idea on what we found? Cow/Bison/Horse?  Can send more photos if needed. Thanks in advance for your help. 

Edited November 11, 2019 by BIEN12

[BIEN12]

[PaleoNoel]

The jaw looks like bison or cow, the other piece looks like bone, maybe mosasaur.

[garyc]

I agree with cow/bison jaw, but the smaller piece could be the base of an antler maybe. Where in Texas we’re they found? The answer may eliminate the possibility of mosasaur

[Rockwood]

I don't think that's an antler.

[PaleoNoel]

56 minutes ago, Rockwood said:

I don't think that's an antler.

I agree, I don't see any of the common features I would associate with one, like the bumps along the base or the transitional part where it attaches to the skull.

[Rockwood]

Distal end of a tibia ?

[JohnJ]

The second piece looks more like a proximal metapodial.

[Rockwood]

1 hour ago, JohnJ said:

The second piece looks more like a proximal metapodial.

The dimple on the top in the first photo of it does look right for the junction of the two.

[BIEN12]

Both were found in Robertson County. I am second guessing myself about the Bison/Cow Jaw is even being a fossil. The Blue tint in the teeth lead me to believe it was but now i am not sure anymore. Thoughts?

[Rockwood]

A good start would be to lightly tap the jaw with something like a spoon. A mineralized fossil will have a high pitched sound. A modern bone will have more of a low tunk sound.

The test is just one thing to consider though.

[fifbrindacier]

Try to burn a little surface of the bone, if it smells, this is not fossil.