Irtysh River Formation
Geology
Members: unnamed (2)
Lithologies: not reported (1), mudstone (1), siltstone (1)
Paleoenvironments: terrestrial indet. (1), fluvial-lacustrine indet. (1)
Age range: Late/Upper Eocene or 37.20000 to 33.90000 Ma
Collections
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Priabonian | China (Xinjiang) | (176208) | |
| Late/Upper Eocene | China (Xinjiang) | (175250) |