| Meng-Yin Formation | |
|---|---|
| Stratigraphic range: Berriasian-Valanginian ~ | |
| Type | Geological formation |
| Lithology | |
| Primary | Sandstone |
| Other | Siltstone |
| Location | |
| Coordinates | 35°54′N 118°00′E / 35.9°N 118.0°E |
| Approximate paleocoordinates | 36°54′N 120°12′E / 36.9°N 120.2°E |
| Region | Shandong |
| Country |  China |
  Meng-Yin Formation (China)  Meng-Yin Formation (Shandong) | |
The Meng-Yin or Mengyin Formation (simplified Chinese: 蒙阴组; traditional Chinese: 蒙陰組; pinyin: Méngyīn Zǔ) is a geological formation in Shandong, China, whose strata date back to the Berriasian and Valanginian stages of the Early Cretaceous.[1][2]
Dinosaur remains are among the fossils that have been recovered from the formation.[3] The type material for the titanosauriform dinosaur Euhelopus was excavated at this formation by Otto Zdansky in 1923, in green/yellow sandstone and green/yellow siltstone that were deposited during the Barremian or Aptian stages of the Cretaceous period, approximately 129 to 113 million years ago.[4]
Both the genus and species of Mengyinaia mengyinensis were named after the formation.
