Olsen’s work on the Thomas Farm Caninae (dog-like carnivores, including Metatomarctus and the bear-dog, Amphicyon, and their kin) in the late 1950s and early 1960s is regarded as foundational for subsequent studies of those and related species.
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This unique site records predator-prey interactions of the coyote-like Metatomarctus and the ancestral horse, Parahippus, as well as a host of other species, on the margins of an 18 million year-old wooded sinkhole and cave complex.