M3#1984 All footprints in Fig. 8 (Hongyangoukou Slab 3) are tridactyl theropod footprints assigned to Morphotype I and tentatively identified as Eubrontes-like. Slab 3 preserves at least seven isolated footprints (HYGK-TI34βTI40) and no trackways; these footprints have relatively distinct tridactyl outlines and U- or V-shaped metatarsophalangeal regions, with some specimens (e.g., TI37 and TI38) preserving claw impressions but lacking digital pad impressions. The divarication angle between digits II and IV on Slab 3 ranges from 53Β° to 57Β° (mean 56Β°). As members of Morphotype I, they fall within the morphotype ranges for footprint length (10.8β20.9 cm; mean 16.0 cm), length-to-width ratio (1.1β1.7; mean 1.4), and mesaxony (weak; mean 0.47).
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#1984. doi: 10.18563/m3.sf.1984
Specimen infos
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Sex : indetAge (if applicable) : Material Type : trackOrigin :
Taxonomy
Description
All footprints in Fig. 8 (Hongyangoukou Slab 3) are tridactyl theropod footprints assigned to Morphotype I and tentatively identified as Eubrontes-like. Slab 3 preserves at least seven isolated footprints (HYGK-TI34βTI40) and no trackways; these footprints have relatively distinct tridactyl outlines and U- or V-shaped metatarsophalangeal regions, with some specimens (e.g., TI37 and TI38) preserving claw impressions but lacking digital pad impressions. The divarication angle between digits II and IV on Slab 3 ranges from 53Β° to 57Β° (mean 56Β°). As members of Morphotype I, they fall within the morphotype ranges for footprint length (10.8β20.9 cm; mean 16.0 cm), length-to-width ratio (1.1β1.7; mean 1.4), and mesaxony (weak; mean 0.47).
Related article
3D models related to the publication: New Cretaceous dinosaur track sites from the Jiaguan Formation, Sichuan Province, China: ichnotaxonomy and preservation
Published online: 08/10/2026 Dinosaur tracks ; Jiaguan Formation ; Photogrammetry
https://doi.org/10.18563/journal.m3.317
Abstract
The present 3D dataset contains the 3D models analyzed in Xing et al. (in press), Newly discovered Cretaceous dinosaur track sites from the Jiaguan Formation, Sichuan Province, China: ichnotaxonomy and preservation. The dataset includes photogrammetric 3D models of the specimens shown in Figures 6–9 and 16–17 of the original article. These correspond to track-bearing slabs and selected footprints from the Hongyangoukou and Jinyuxi tracksites and the Shimiaogou 2025 tracksite in the Gulin area, Sichuan Province, China. The Hongyangoukou material comprises three reddish-brown siltstone slabs preserving at least 61 theropod tracks, including nine trackways (HYGK-T1 to HYGK-T9) and isolated footprints (HYGK-TI1 onward). The Jinyuxi material comprises one isolated theropod natural cast (JYX-TI5) assigned to cf. Eubrontes , associated with microbially induced sedimentary structures (MISS). The Shimiaogou 2025 material comprises two slabs preserving at least 25 dinosaur footprints, including ornithopod trackways SMG25-O1 and SMG25-O2, theropod trackway SMG25-T1, and isolated footprints; all occur as natural positive reliefs. The 3D surface models are provided in PLY format.
M3 article infos
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, Jens N. Lallensack