14 A B C D 1.1. The morphological changes in a tridactyl track exposed to different degrees of erosion. The example is a plaster cast of an emu track emplaced in soft mud and afterward sectioned horizontally to simulate erosion of a track with the sedimentary inill still in place. (A) Section cut just below the tracking surface. (B) Section cut 14 mm below the tracking surface. (C) Section cut 25 mm below the tracking surface. (D) Section cut 38 mm below the tracking surface. Notice how the overall dimen- sions of the track become smaller with depth and that the individual parts of the track become separated with depth, until only the most deeply impressed parts are present, in this case, the distal part of the impression of the middle digit and the pad covering the metatarsal joint. Figure based on experimental data from Milàn and Bromley (2006). DinoTracks.indb 14 1/22/16 11:19 AM