. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. AMERICAN MUSEUM NOVITATES' [No. 42 include strata of both Tertiary and Cretaceous ages. It is clear also that the term Gobi formation or Gobi series is properly applied to the Tertiary beds instead of to those of Cretaceous age. The finding of a Cretaceous formation below makes a new designa
. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. AMERICAN MUSEUM NOVITATES' [No. 42 include strata of both Tertiary and Cretaceous ages. It is clear also that the term Gobi formation or Gobi series is properly applied to the Tertiary beds instead of to those of Cretaceous age. The finding of a Cretaceous formation below makes a new designation necessary. For this purpose nothing seems to be as appropriate as the name of this locality. We therefore propose the term Iren Dabasu formation for these beds. fZO'. 5co.^.t of MlUs 0 50 too ISO -MO 250 3i;o Fig. 1. Sketch map showing location of type sections of Iren Dabasu Formation (Cretaceous) 1; Irdin Manha Formation (Eocene) 2; Houldjin Formation (Miocene) 3. The Houldjin Beds (Middle Tertiary).—For the late Tertiary beds found five miles farther south and belonging to the Gobi Series of Obretcheff we propose the term Houldjin Beds, taken from the local name of the upland formed by these beds. They are characterized by the following fossil content: 1.—A rhinocerid. 2.—A large carnivore. 3.—An artiodactyl of the size of a Virginia deer. 4.—An enormous mammal, probably a perissodactyl and possibly related to or identical with Baluchitherium, discovered by Forster Cooper in Baluchistan. 5.—A tortoise of large Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Central Asiatic Expeditions (1921-1930); Andrews, Roy Chapman, 1884-1960; Matthew, William Diller, 1871-1930. [New York : American Museum of Natural History
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