Placerias hesternus

 

Placerias hesternus

Locality: Arizona
Formation: Chinle
Length: 3 m (10 feet)
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Placerias hesternus scale

Placerias hesternus

Named for their enormous caniform tusks, dicynodonts (meaning “two dog teeth”) like Placerias were large, semi-aquatic hippo-like herbivores. Herding behavior is evident in the recovery of 40 individual specimens from a single mass-mortality site just Southeast of Petrified Forest in Arizona at the locality known as the “Placerias Quarry” which was discovered by Samuel Welles and Charles Camp in 1930.