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Plesiosaur (Cimoliasaurus magnus)
Age – Late Cretaceous; Commonality – scarce; Size – teeth: ½ to 2 inches, vertebrae: ~1 ½ to 5 inches, most are around 2 inches
The teeth of this plesiosaur have a circular, sometimes elliptical base and a slender crown. The crown has prominent striations and no carinae. The teeth curve backwards toward the lingual side. The curvature in plesiosaur teeth is different from the curvature in crocodile teeth in that the tooth does not curve back much in the bottom section of the tooth, and then at a certain point on the tooth it starts to curve back significantly. Croc teeth are also relatively fatter at the base and smoothly taper to a point, while plesiosaur teeth don’t taper that much initially, and then start tapering to a point.
The vertebrae are massive and distinct. The dorsal side has a hole and the ventral side has two holes. The two faces are slightly concave. The thoracic vertebrae are longer than the neck and tail vertebrae. Other bones are rare.
This plesiosaur tooth has less prominent striations. The tip damage is either in vivo wear or some kind of post-mortem wear.
Fragment 1 - Oblique View
Fragment 2 - Oblique View
These two fragments show the bone structure/texture well. The vertebral surfaces are much denser, while the inside is more porous and has a unique pattern.
EDIT: second fragment is actually a mosasaur vert. Will be moved.