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Minnesota Nice

Small jaw secton with teeth

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Minnesota Nice

From White River formation South Dakota. Has some appearance of Oreodont but it seems small. 

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caldigger

Maybe a juvenile Oreodont.

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Minnesota Nice
17 minutes ago, caldigger said:

Maybe a juvenile Oreodont.

Thought about that....When I compared it to a full set of teeth from an adult, these smaller teeth show considerable wear, making me think it is adult. Is there any other distinguishing characteristics of adult dentition in Oreodont?

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Harry Pristis

Looks like oreodont to me.  I have a skull w/mandible in which the lower tooth row is about two inches long.  (The lower teeth are obscured by the uppers.)  I am uncertain of the taxonomy.  My specimen is labeled by the preparer, Merycoidodon sp., but I have an early reference to "Oreodon gracilis."  Could be. this is now Merycododon gracilis.  Maybe one of the Midwestern collectors will help us out.

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jpc

I think Harry hit the nail on the head.  Other than the teeth, the back end of an oreo jaw is very deep, and it looks like yours tends that way. The unworn tooth is the last molar, and if you look tat the jaw from the side it is deep under that last molar.

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abyssunder

Looks like Merycoidodon partial lower jaw to me also, although I don't know which species belongs to.

 

According to this document, the list of Chadron and Brule Formations comprise the following species :

 

Early Oligocene (Chadronian) of Chadron Formation

M. culbertsonii (Leidy)
M. lewisi Clark and Beerbower, 1967 (CM9105)

 

Middle Oligocene (Orellan) of Lower Brule Formation

M. culbertsonii (Leidy), 1848 (ANSP10727, 10728)
M. dani Schultz and Falkenbach

 

Late Oligocene (Whitneyan) of Upper Brule Formation

M. galushai Schultz and Falkenbach, 1968 (F:AM45279)
M. lambi Schultz and Falkenbach, 1968 (F:AM72139)
M. lynchi Schultz and Falkenbach, 1968 (F:AM45297)

 

 

 

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