M3#1985 JYX-TI5 is tentatively assigned to cf. Eubrontes. It is preserved as a natural cast on dark red quartz sandstone, with a preservation grade of 0.5–1.5. It shows largely complete digit impressions and a metatarsophalangeal region, as well as some claw impressions, but no digital pad impressions. The footprint has three distinct digit impressions, a relatively distinct U-shaped metatarsophalangeal region, a separation between the proximal region of digit III and the metatarsophalangeal region, and relatively clear claw impressions; its surface bears irregular linear ridges that likely represent microbially induced sedimentary structures (MISS). JYX-TI5 is 22.1 cm long, with a length-to-width ratio of 1.5, weak mesaxony (0.45), and a divarication angle between digits II and IV of 50°; the interdigital angle between digits II and III is slightly larger than that between digits III and IV.
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#1985. doi: 10.18563/m3.sf.1985
Specimen infos
Collection
Information
Sex : indetAge (if applicable) : Material Type : trackOrigin :
Taxonomy
Description
JYX-TI5 is tentatively assigned to cf. Eubrontes. It is preserved as a natural cast on dark red quartz sandstone, with a preservation grade of 0.5–1.5. It shows largely complete digit impressions and a metatarsophalangeal region, as well as some claw impressions, but no digital pad impressions. The footprint has three distinct digit impressions, a relatively distinct U-shaped metatarsophalangeal region, a separation between the proximal region of digit III and the metatarsophalangeal region, and relatively clear claw impressions; its surface bears irregular linear ridges that likely represent microbially induced sedimentary structures (MISS). JYX-TI5 is 22.1 cm long, with a length-to-width ratio of 1.5, weak mesaxony (0.45), and a divarication angle between digits II and IV of 50°; the interdigital angle between digits II and III is slightly larger than that between digits III and IV.
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