Fig. 3: Amniote footprints.
From: Earliest amniote tracks recalibrate the timeline of tetrapod evolution
a–c, Three footprints of Notalacerta from the middle Serpukhovian to early Bashkirian Wałbrzych Formation of Silesia, Poland; each is shown as an optical scan (top) and photo (bottom). Holy Cross Branch of the Polish Geological Institute – National Research Institute in Kielce, Muz. PGI-OS 220/182 (a), 184 (b) and 185 (c). d, Isolated left pes print Ip from the Snowy Plains Formation slab NMV P258240 (Fig. 2c,d), reproduced here to facilitate comparison with other amniote footprints. e–g, Presumed sauropsid prints, manus (top) and pes (bottom), of Notalacerta (e), Varanopus (f) and Dromopus (g), all from ref. 2. h, Dimetropus manus or pes imprint, natural cast, IGWU-1, Geological Museum of the Institute of Geological Sciences, University of Wrocław, Wrocław. Labelling as in Fig. 2. Scale bars, 10 mm. Photos in e–g reproduced from ref. 2, Frontiers Media, under a Creative Commons licence CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).
