Ulangochuian

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The Ulangochuian age is a period of geologic time (37.2—33.9 Ma) within the Late Eocene epoch of the Paleogene used more specifically with Asian Land Mammal Ages. It follows the Sharamurunian and precedes the Ergilian age.

The Paleogene is a geologic period and system that spans 43 million years from the end of the Cretaceous Period 66 million years ago (Mya) to the beginning of the Neogene Period 23.03 Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon. The Paleogene is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous–Paleogene extinction event that ended the preceding Cretaceous Period. The United States Geological Survey uses the abbreviation PE for the Paleogene, but the more commonly used abbreviation is PG with the PE being used for Paleocene.

The Sharamurunian age is a period of geologic time within the Middle Eocene epoch of the Paleogene used more specifically with Asian Land Mammal Ages. It follows the Irdinmanhan age and precedes the Ulangochuian age.

The Ergilian age is a period of geologic time within the Late Eocene epoch of the Paleogene used more specifically with Asian Land Mammal Ages. It follows the Ulangochuian and precedes the Houldjinian age.

The Ulangochuian's upper boundary is the approximate base of the Rupelian age. [1]

The Rupelian is, in the geologic timescale, the older of two ages or the lower of two stages of the Oligocene epoch/series. It spans the time between 33.9 and28.1 Ma. It is preceded by the Priabonian stage and is followed by the Chattian stage.

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