Chengzhi Formation
Geology
Age range: base of the Middle Jurassic to the top of the Late/Upper Jurassic or 174.70000 to 143.10000 Ma
Collections
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Jurassic | China (Liaoning) | (29567) | |
| Late/Upper Jurassic | China (Heilongjiang) | (29691 29991 29993) |