APPENDIX 1.

The full sized Gigapan image of UUIC 1873 (656 megapixels), presented at reduced size as Figure 1 and Figure 2, can be viewed at the Gigapan website (http://www.gigapan.com/gigapans/174739) where the viewer can zoom to the maximum resolution at any part of the entire slab. The viewer should be aware that when viewed at this site the slab is oriented as displayed at the University of Utah.

APPENDIX 2.

The full size image reduced to create Figure 2. UUIC 1873 (824.8MB) rotated from as exhibited at the University of Utah to the orientation at the time of track formation. This file, append2.tif, can be downloaded from a folder in Box that can be reached with the link (https://unomaha.box.com/s/yqehi4vgasbsdvgpaqo72ef3m8s20ay7).

APPENDIX 3.

The full sized Gigapan image of the track bearing surface at locality 490 (284 megapixels) can be viewed at the Gigapan website (http://www.gigapan.com/gigapans/174736) where the viewer can zoom to the maximum resolution at any part of the entire slab. Discoloration of transverse trackway is artifact of molding the trackway.

APPENDIX 4.

The full size image reduced to create Figure 5 viewable with the map in Figure 6 as an overlay. Composite photograph of the track-bearing surface of DNM 490 and outlines of tracks on an overlying layer (123.7MB). This file, append4.ai, can be downloaded from a folder in Box that can be reached with the link (https://unomaha.box.com/s/yqehi4vgasbsdvgpaqo72ef3m8s20ay7).

APPENDIX 5.

The full size image reduced to create Figure 7. Composite image of the long transverse trackway at DNM 490 (89.4 MB). This file, append5.tif, can be downloaded from a folder in Box that can be reached with the link (https://unomaha.box.com/s/yqehi4vgasbsdvgpaqo72ef3m8s20ay7).