Pliosaur - indet.
Matrix free phalange from the paddle limb of a large predatory marine reptile. All faces intact. The curved outer surface would suggest this bone has come from the outer leading edge of the paddle limb.
Jurassic, Kimmeridge Clay.
Oday, Abingdon, Oxfordshire.
Bone : 5.5 x 6.5 x 3 cm.