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.G. G. Simpson. 1928. A Catalogue of the Mesozoic Mammalia in the Geological Department of the British Museum 1-215
T. bisulcus is known from the Morrison Formation, where it is present in stratigraphic zone 5,Foster, J. (2007). "Appendix." Jurassic West: The Dinosaurs of the Morrison Formation and Their World. Indiana University Press. pp. 327-329. and three other species from the Purbeck Group in Dorset.Clemens, W.A., 1963. L ate Jurassic mammalian fossils in the Sedgwick Museum, Cambridge . Palaeontology, 6(Part 2), pp.373-377.
See also List of prehistoric mammals Paleobiota of the Morrison Formation
References