Fig. 10 in Earliest Cretaceous mammals from the western United States

Fig. 10. Simplified cladogram showing known North American distribution of mammalian taxa during the Jurassic and Cretaceous. Grey bar indicates temporal range of deposits of the Lakota Formation (Lower Cretaceous: upper Berriasian–lower Barremian). Closed circles indicate mammalian fossils described in this study (temporal distributions given as mid-ranges for respective estimates). Dashed lines indicate stratigraphic range extensions of groups otherwise restricted to the Late Jurassic (Morrison Formation) or unrecorded until the Aptian–Cenomanian (Antlers, Arundel, Cloverly, and Cedar Mountain formations), highlighting the transitional composition of the Lakota assemblage. Cladogram modified from Luo (2007), geologic time scale modified from Gradstein et al. (2012).