Colymbosaurus trochanterius (Owen).
Beautifully preserved marginal carpal bone from the front paddle limb of a Plesiosaur. Excellent surface detail under magnification. Specimens from Radley hardly ever come up for sale.
Jurassic, Kimmeridge Clay.
Radley near Abingdon, Oxfordshire.
Bone : 5 x 4.5 x 3 cm.