Ichthyosaur vertebrae fossil specimen belonging to the genus Brachypterygius. Ichthyosaurs were a group of marine reptiles which lived during the Jurassic period, these sampled were found in the Kimmeridgian clay beds of Abingdon, Oxfordshire, dating them to between 157 to 152 millions years old. The animals them selves are often easily identified by many, as their body shapes resembled that of modern day dolphins, except the tail fluke propelled the reptile by moving side to side as opposed to up and down. Quick and agile with a mouth full of small, pointed teeth, it is believed that they fed on small fish and ammonites, however, ichthyosaurs them selves were prey to the various species of large pliosaurs which also lived during the same time period, such as liopleurodon. This particular vertebra has been cut and polished along the thinnest plane, parallel to the diameter of the bone, leaving behind a "half-doughnut" shape which displays the cross section of the peripheral vertebrae in great detailo. Measuring 90 mm in diameter and weighing 115 grams, this specimen comes provided with a white card tray and information label.