Trioracodon fossil map
Where fossils of Trioracodon have been found, shown on the Earth as it looked about 145 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 145 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 | 154.8–139.1 million years ago (Kimmeridgian to Berriasian) |
| Periods | Jurassic, Cretaceous |
| Family | Triconodontidae |
| Named by | Simpson 1928 |
| Fossil records | 12 occurrences at 2 locations (PBDB) |
| Found in | United Kingdom, United States |
| Rock formations | Lulworth, Morrison |
About Trioracodon
Trioracodon is an extinct genus of Late Jurassic to Early Cretaceous eutriconodont mammal found in North America and the British Isles. It was named in 1928.
T. bisulcus is known from the Morrison Formation, where it is present in stratigraphic zone 5, and three other species from the Purbeck Group in Dorset.
Text in “About” is quoted from the Wikipedia article Trioracodon (revision 1318429445), 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: Q7843164.
