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Dinosaur tracks from Jurassic–Cretaceous boundary in Hebei Province, China.

From: Ben Creisler

A new online paper:

Li-Da Xing, Yong-Qing Liu, Hong-Wei Kuang, Hendrik Klein, Jian-Ping
Zhang, Michael E. Burns, Jun Chen, Ming-Wei Wang & Jian Hu (2013)
Theropod and possible ornithopod track assemblages from the
Jurassic–Cretaceous boundary Houcheng Formation, Shangyi, northern
Hebei, China.
Palaeoworld (advance online publication)
doi: http://dx.doi.org/10.1016/j.palwor.2013.10.002

Dinosaur track assemblages from the Houcheng Formation in the small
continental Shangyi Basin of northern Hebei Province, China bridge a
gap in the record of vertebrates from this unit and enrich our
knowledge of ichnofaunas from the Jurassic–Cretaceous boundary. Their
stratigraphic position between the Middle Jurassic Yan-Liao Biota and
the Lower Cretaceous Jehol Biota gives them a special importance. New
discoveries allow a re-assessment of theropod and possible ornithopod
tracks that are present with several trackways. Seventy-three
footprints were examined and documented. Despite their smaller size,
the tridactyl mesaxonic theropod tracks show morphological
similarities with the ichnogenus Therangospodus known from the Upper
Jurassic deposits of North America, Europe, and Central Asia. The
possible ornithopod tracks lack an associated manus imprint,
suggesting a bipedal trackmaker. These possible ornithopod tracks from
the Houcheng Formation provide evidence for the presence of small
basal ornithopods or basal Cerapoda in the Upper Jurassic–Lower
Cretaceous in this region. The depositional environment was the margin
of an extensive shallow lake with fluctuating water levels under
seasonally dry climate.