South America

One Jurassic mammal has been described from the South American continent: Asfaltomylos patagonicus, represented by a dentary with much of the postcanine dentition (Rauhut et al., 2002). Asfaltomylos has a tribosphenic molar pattern and peculiar specializations of the premolars and molars; it has been referred to Australosphenida, an endemic Gondwanan group that includes monotremes (chapter 6). The specimen was collected from the Canadon Asfalto Formation at Queso Rallado, Chubut, Argentina. The occurrence is regarded as being of late Middle to early Late Jurassic (Callovian-Oxfordian) age.

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