1953 - 1991
The Hall of Early Mammals was known also the Giant Sloth or Paleocene Hall and many specimens were moved here from the Hall of Late Mammals. The Hall of Early Mammals exhibited extinct primitive mammals such as Diprotodon, Phobosuchus, Meniscotherium, Ectoconus, Phenacodus, Coryphodon, Uintatherium, Orycteropus, Macrauchenia, Toxodon, Scarritta, Hapaclops, Megalocnus, Glyptodon, Panochthus, Oxyaena, Deltatheridium, and Tarsius, as well as other fossil animals such as fish and a Pleistocene tortoise from India. A highlight of the hall was a group of giant ground sloths from South America that included Mylodon and Lestodon (1, 1953, p. 64-67; 1, 1956, p. 69). Dioramas presented Eocene and Paleocene lake life from Wyoming, Colorado, and Utah, exhibits on the evolution of primates, bats, and insectivores. Exhibits on fossilization, fossil collecting, preparation, and interpretation were on view and visitors could examine the evolution of non-dinosaur reptiles, and the skull and restoration of Andrewsaurchus (1, 1962, p. 37; 3, 1972, p. 66).
In the early 1990s the Halls of Early and Late Mammals were closed to make way for the Hall of Primitive Mammals and the Paul and Irma Milstein Hall of Advanced Mammals (2, 1990/91, p. 1). Many of the same fossil specimens from the previous halls can be viewed in the current halls.
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