My first bone?

[Fin Lover]

I need help to identify one more thing, please (for now). Found this on the bank at Sawmill Branch in Summerville, SC (note: did not dig, use tools or collanders, or go under the water, although I know I can go under the water once I get a hobby license ). I believe it is my first piece of bone (may have some small chips from the beach, but nothing this size). Husband thinks it's bone, as well. Is there any way to identify something this size?  Type of animal and general area of the body is sufficient for me (I don't know what some of the specifics mean anyways).  Sorry if the pics aren't great, but the varying depths are confusing the camera, and having tremors doesn't help.

[SawTooth]

I believe it is bone, the main giveaway is the spongy texture on the inside area. It appears to be near a joint, though I could not tell you exactly.

[val horn]

It is clearly a piece of bone.  Id beyond that might not be possible.  There is a flat surface that looks like it is part of an articular  surface, from there i might guess at proximal end of a tibia because of how flat it is, from some small creature .  I keep such bone pieces because you may well find a more complete example that will id  this piece

[Fin Lover]

Ok, thank you both!