The type specimen for Thalassocnus natans is a skull, lower jawbone (mandible) and partial skeleton. It was found in the Pisco Formation in sediments that dated to the Montehermosan age of the Miocene Epoch (~6 mya) (McDonald and de Muizon 2002)
- McDonald, H. G., and C. de Muizon. 2002. The cranial anatomy of Thalassocnus (Xenarthra, Mammalia), a derived nothrothere from the Neogene of the Pisco Formation (Peru). Journal of Vertebrate Paleontology 22:349-365.
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