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M3#1986

Fig. 16 includes ornithopod footprints assigned to Caririchnium isp. and theropod footprints tentatively assigned to cf. Grallator. The ornithopod tracks are natural casts, clearest on Slab 1, and show a distinct quadripartite structure. Preservation grade is 1–2; footprint length is 23.5–31.2 cm (mean 27.3 cm), and length-to-width ratio is 1.2–1.5 (mean 1.4). They are highly symmetrical, with three clear rounded digit impressions and a sub-circular metatarsophalangeal region separated by a depression; claw impressions are absent, mesaxony is weak (0.24–0.38; mean 0.30), and the mean divarication angle between digits II and IV is 49°. The potential trackway SMG25-O2 has a pace length about 2.7 times the footprint length, a pace angulation of 111°, and inward rotation of about 15°. The theropod tracks are mostly isolated, with only one potential trackway, SMG25-T1, on Slab 1. Preservation grade is 1–2; footprints are small (8.5–20.4 cm) and generally slender, mostly complete tridactyl impressions with digit III longest and digit II shortest, V-shaped metatarsophalangeal regions, and faint claw impressions or digital pads in some tracks. SMG25-T1 comprises two footprints (mean length 19.9 cm, length-to-width ratio 1.9, mesaxony 0.54, mean divarication angle between digits II and IV 41°). Isolated footprint TI9 is the best preserved (length 9.8 cm, length-to-width ratio 2.1, mesaxony 0.72, divarication angle between digits II and IV 38°), with the metatarsophalangeal pad of digit IV aligned along the axis of digit III.

Data citation: Lida Xing Logo, Jens N. Lallensack Logo, Junhong Mou, Lin Liu Logo, Shan Jiang, Qi Qi Logo, Anthony Romilio Logo, Yong Ye, Xin Shen and Ting Xu, 2026. M3#1986. doi: 10.18563/m3.sf.1986

Model solid/transparent

Specimen infos
Collection

Information
Sex : indet

Age (if applicable) :

Material Type : track

Origin :

Taxonomy
Class : Sauropsida

Order : Saurischia

Family : Grallatoridae

Genus : Grallator

Species :✝isp.


Description
Fig. 15 includes ornithopod footprints assigned to Caririchnium isp. and theropod footprints tentatively assigned to cf. Grallator. The ornithopod tracks are natural casts, clearest on Slab 1, and show a distinct quadripartite structure. Preservation grade is 1–2; footprint length is 23.5–31.2 cm (mean 27.3 cm), and length-to-width ratio is 1.2–1.5 (mean 1.4). They are highly symmetrical, with three clear rounded digit impressions and a sub-circular metatarsophalangeal region separated by a depression; claw impressions are absent, mesaxony is weak (0.24–0.38; mean 0.30), and the mean divarication angle between digits II and IV is 49°. The potential trackway SMG25-O2 has a pace length about 2.7 times the footprint length, a pace angulation of 111°, and inward rotation of about 15°. The theropod tracks are mostly isolated, with only one potential trackway, SMG25-T1, on Slab 1. Preservation grade is 1–2; footprints are small (8.5–20.4 cm) and generally slender, mostly complete tridactyl impressions with digit III longest and digit II shortest, V-shaped metatarsophalangeal regions, and faint claw impressions or digital pads in some tracks. SMG25-T1 comprises two footprints (mean length 19.9 cm, length-to-width ratio 1.9, mesaxony 0.54, mean divarication angle between digits II and IV 41°). Isolated footprint TI9 is the best preserved (length 9.8 cm, length-to-width ratio 2.1, mesaxony 0.72, divarication angle between digits II and IV 38°), with the metatarsophalangeal pad of digit IV aligned along the axis of digit III.

Related article
3D models related to the publication: New Cretaceous dinosaur track sites from the Jiaguan Formation, Sichuan Province, China: ichnotaxonomy and preservation
Lida Xing, Jens N. Lallensack, Junhong Mou, Lin Liu, Shan Jiang, Qi Qi, Anthony Romilio, Yong Ye, Xin Shen and Ting Xu
Published online: 08/10/2026

Keywords: 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

Article state: in_press

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