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cf. Pliosaurus kevani

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cf. Pliosaurus kevani

Specimen is from the Late Jurassic Epoch, Kimmeridgian Age Clay - between 157.3 to 152.1 +/- Ma (million years ago).

 
 
Specimen is most likely a chunk of Pliosaurus kevani, which is known from that region and from that same time period (Kimmeridgian clay).
 
Specimen has an exposed tooth (root portion) with enamel measuring 4.72 inches in length and 1.67 inches in width
Other measurements include 3.38" in specimen width (maxillary bone)
 
Tooth position appears to be tooth #6 from the very tip of the snout, including the two tiny teeth at the terminus. This is based on angle of projection, texture, and the distinctive bone seam that is visible in some of the photos (#12 in particular) as well as the diagram of P. kevani. Tooth position is indicated via a red dot on diagram. 
 
There are also sensory pits (foramina) visible on the outer side of the specimen, as well as exposed bone on the inside portion. A few holes bored in the bone from some sort of marine organism (worms perhaps) prior to fossilization. 
 
Size estimate: I found a paper on the Kevani animal and checked the measurements. The exact tooth socket in that fossil is ~44mm in width (1.73 inches). The tooth in this specimen is only 0.06 inches smaller, suggesting it came from a similar size animal. The Pliosaurus kevani is supposed to have had a head 2.4 meters in length which means the whole animal was around 12 meters or 40 feet or as big as a bus. Like the picture shown.* A HUGE predatory marine reptile. 
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