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Cretaceous dinosaur tracks from Dasheng Group, Shandong Province, China.
From: Ben Creisler
A new paper reporting notable number of didactyl deinonychosaurian-type prints:
Lida Xing, Martin G. Lockley, Daniel Marty, Hendrik Klein, Lisa G.
Buckley, Richard T. McCrea, Jianping Zhang, Gerard D. Gierliński,
Julien D. Divay &, Qingzi Wu (2013)
Diverse dinosaur ichnoassemblages from the Lower Cretaceous Dasheng
Group in the Yishu fault zone, Shandong Province, China.
Cretaceous Research 45: 114–134
New dinosaur track assemblages were discovered recently in the
Tianjialou Formation of the Lower Cretaceous Dasheng Group in Shandong
Province, China. Theropods are represented by the trackways of two
different medium-sized groups: (1) tridactyl tracks with a typical
mesaxonic shape; (2) functionally didactyl tracks attributed to
deinonychosaurian theropods. The latter report, the third from the
Cretaceous of Shandong Province, enlarges the global record of
didactyl theropod tracks, until now sparsely documented from only a
few locations in Asia, North America and Europe. A number of features
in the dromaeosaur trackway suggest the assignment to cf.
Dromaeosauripus. Several medium-sized trackways resemble the
narrow-gauge, small manus ichnogenus Parabrontopodus, and one large
trackway is characterised by a wide-gauge and large manus, similar to
Brontopodus. This suggests the co-occurrence of two different sauropod
groups. A further component in these ichnoassemblages is a tetradactyl
morphotype and trackways of ornithischian affinity that are
tentatively attributed to psittacosaurs.