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M3#1983 All footprints in Fig. 7 (Hongyangoukou Slab 2) are tridactyl theropod footprints assigned to Morphotype II and tentatively identified as Eubrontes-like. Slab 2 preserves at least 28 footprints, including two trackways (HYGK-T8 and HYGK-T9) and 18 isolated footprints (HYGK-TI16–TI33). Preservation is poorer than on Slab 1: impressions are shallower and more rounded overall; in T9 and in some isolated footprints (e.g., TI17, TI18, TI20, TI23, TI24, and TI26), discrete digit impressions are not recognizable and instead appear as oval depressions, whereas the remaining footprints show three discernible digit impressions. No digital pad impressions were observed; the metatarsophalangeal region is U-shaped, and relatively clear claw impressions are preserved in some tracks, such as T8-R1, TI18, and TI31. Footprint length ranges from 11.2 to 21.6 cm (mean 15.1 cm); the length-to-width ratio ranges from 0.9 to 1.7 (mean 1.4); mesaxony is weak (mean 0.45); and the divarication angle between digits II and IV ranges from 46° to 62° (mean 54°). The stride lengths of T8 and T9 are 60 cm and 116 cm, corresponding to approximately 4 and 7.7 times the average footprint length, respectively; the pace angulation of T9 is 166°. TI31 is relatively well preserved and markedly symmetrical, with digit III being the stoutest and longest, and with a distinct, sharp claw impression. Type: "3D_surfaces"
doi: 10.18563/m3.sf.1983
Data citation:
Lida Xing, Jens N. Lallensack, Junhong Mou, Lin Liu, Shan Jiang, Qi Qi, Anthony Romilio, Yong Ye, Xin Shen and Ting Xu, 2026. M3#1983. doi: 10.18563/m3.sf.1983
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