The Alagteeg Formation is a geological formation in Mongolia whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.[1] It predominantly consists of alternating reddish brown mudstone and horizontally laminated sandstone, with ripple cross laminations and rhizoliths. It was first formally defined as a unit by Hasegawa et al in 2008 as a distinct unit from the overlying Djadochta Formation. The environment of deposition is suggested to be fluvial, originating in sandy braided river, floodplain and ephemeral lake depositional environments, as opposed to the desert depositional environment of the Djadochta Formation.[2]
| Alagteeg Formation | |
|---|---|
| Stratigraphic range: Santonian-Campanian ~ | |
| Type | Geological formation |
| Underlies | Djadochta Formation |
| Thickness | ~16 m (52 ft) at the Bayan Zag locality |
| Lithology | |
| Primary | Sandstone, mudstone |
| Location | |
| Coordinates | 44°18′N 103°18′E / 44.3°N 103.3°E |
| Approximate paleocoordinates | 41°54′N 92°24′E / 41.9°N 92.4°E |
| Region | Ömnögovi Province |
| Country |  Mongolia |
| Extent | Ulaan Nuur Basin |
| Type section | |
| Named for | Alag Teeg |
| Named by | Hasegawa et al. |
| Year defined | 2009 |
| Thickness at type section | ~15 m (49 ft) |
  Alagteeg Formation (Mongolia) | |
Vertebrate paleofauna edit
See also edit
References edit
Bibliography edit
- Averianov, Alexander O., and Alexey V. Lopatin. 2020. An unusual new sauropod dinosaur from the Late Cretaceous of Mongolia. Journal of Systematic Palaeontology .. .. . doi:10.1080/14772019.2020.1716402
- Hasegawa, Hitoshi; Ryuji Tada; Niiden Ichinnorov, and Chuluun Minjin. 2009. Lithostratigraphy and depositional environments of the Upper Cretaceous Djadokhta Formation, Ulan Nuur basin, southern Mongolia, and its paleoclimatic implication. Journal of Asian Earth Sciences 35(1). 13–26. . doi:10.1016/j.jseaes.2008.11.010
- Weishampel, David B.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21. ISBN 0-520-24209-2