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M3#1982 All footprints in Fig. 6 are tridactyl theropod footprints assigned to Morphotype I and tentatively identified as Eubrontes-like. Fig. 6 (Hongyangoukou Slab 1) preserves at least 31 footprints, comprising seven trackways (HYGK-T1–T7) and 15 isolated footprints (HYGK-TI1–TI15). They are preserved as natural molds in reddish-brown siltstone and are heavily weathered, but they generally retain distinct tridactyl outlines and U- or V-shaped metatarsophalangeal regions. Claw impressions are present in some specimens (e.g., T3, T7-L1, and TI9), whereas digital pad impressions are absent. Footprint length ranges from 10.8 to 20.9 cm (mean ≈16.0 cm); the length-to-width ratio ranges from 1.1 to 1.7 (mean ≈1.4); mesaxony is weak (mean ≈0.47); and the divarication angle between digits II and IV ranges from 41° to 73° (mean ≈60°). The stride lengths of T1, T3, T4, and T6 are 144.5, 104.8, 122.3, and 64.5 cm, respectively, corresponding to 9.7, 5.6, 9.4, and 3.3 times their respective mean footprint lengths. T1 and T5 show outward rotations of about 4° and 9°, respectively. T3 is among the best-preserved examples, with digit III the longest and stoutest, digit IV the shortest, and clear claw impressions present on digits II and III, whereas TI10 is a complete tridactyl track. These footprints are therefore small theropod tracks of Morphotype I, tentatively assigned to Eubrontes-like. Type: "3D_surfaces"
doi: 10.18563/m3.sf.1982
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#1982. doi: 10.18563/m3.sf.1982
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