Medial phalanges - middle toe bones between the ungual and the proximal toe bones - are frequently preserved as fossils. They are preserved because they are dense and poorly vascularized. Furthermore, they don't have much flesh surrounding them - not attractive meals for anything that might eat other parts of the animal.
In this image, there are two very different, large animals represented. If you can identify the animals without peeking, leave a comment here. If you're curious to see more images, and you want to find out what the animals are, you can navigate over to this TFF thread:
(This image is best viewed by clicking on the "options" button on the upper right of this page => "view all sizes" => "large".)