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ElToro

Xray of associated Hyaenodon horridus mandibles.

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ElToro

I have two associated Hyaenodon horridus mandibles from Nebraska. They puzzled me because they appear to be from an adult but when I removed some matrix is saw gaps for a molar and a tip of tooth peeping out. I looked into it and it seems that the last molar doesn't reupt until age 3-4 so that is roughly the age of this animal. To verify, I asked a good mate to xray it. You can clearly see the tooth roots below the crowns of the teeth and below the gum line (ie embedded into the bone). You can also clearly make out the mandibular canal (long dark line running ventrally (below) the teeth - it's where the major veins, arteries and nerves of the bone run. Great view of millions of years old bone and teeth! Confirms that the teeth are erupting molars and gives me a great idea of the age. Not, quite juvenile, more like subadult.

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jpc

Nice. It is good to see someone else using xrays.

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ElToro

Nice. It is good to see someone else using xrays.

Thanx mate! You also have used xrays to peer inside a fossil without breaking it?

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