Tsagandelta fossil map
Where fossils of Tsagandelta have been found, shown on the Earth as it looked about 85 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 85 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Early mammals |
|---|---|
| Lived | 100.5–83.6 million years ago (Cenomanian to Santonian) |
| Periods | Cretaceous |
| Family | Deltatheridiidae |
| Named by | Rougier et al. 2015 |
| Fossil records | 2 occurrences at 1 locations (PBDB) |
| Found in | Mongolia |
| Rock formations | Baynshire |
About Tsagandelta
Tsagandelta (meaning "white crest") is a genus of deltatheroidean therian mammal that lived in Asia during the Late Cretaceous. Distantly related to modern marsupials, it is part of Deltatheroida, a lineage of carnivorous metatherians common in the Cretaceous of Asia and among the most successful non-theropod carnivores of the region. It represents the first known mammal from the Bayan Shireh Formation.
Text in “About” is quoted from the Wikipedia article Tsagandelta (revision 1348569203), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q28163503.
