The type fauna of the Ergilian Asian land mammal age is defined by the mammalian fossils of this formation.

[1] Based on the presence of brontotheres and the abundance of herbivorous low-crowned mammals, the Ergilin Dzo Formation has been estimated to be humid and warm/hot with a relatively-closed area.

[2][3] However, the absence of primates and rarity of crocodyliforms (known from one specimen currently) in this formation may suggest the paleoenvironment had open areas and was more arid than similarly aged faunal assemblages from elsewhere in Eurasia.

[1] Sedimentary analyses suggest the Ergilin Dzo Formation was a floodplain environment with a braided stream network formed by fluvial systems.

Fossils of mammals, reptiles (including birds), fish and amphibians have all been recovered from the formation since the early 20th Century.