Earliest amniote tracks the changing of the time capsule of tetrapod evolution

The Snowy Plains Formation trackways, Berrepit in Australia, have a disproportionate impact on our understanding of early tetrapod evolution because of their combination of diagnostic amniote characteristics and early, securely-constrained date. A substantial time interval between the tetrapod and amniote crown-group nodes is a universal feature of recent molecular phylogenies in which both nodes are defined.