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Saurischian dominated ichnofauna from Feitianshan Formation (Lower Cretaceous) of China.

Ben Creisler

A new paper:

Lida Xing, Martin G. Lockley, Geng Yang, Jun Cao, Richard T. McCrea,
Hendrik Klein, Jianping Zhang, W. Scott Persons IV & Hui Dai (2016)
A diversified vertebrate ichnite fauna from the Feitianshan Formation
(Lower Cretaceous) of southwestern Sichuan, China.
Cretaceous Research 57: 79-89

The Bajiu tracksite exposed on a fine sandstone surface at the top of
the Feitianshan Formation, close the contact with the overlying Xiaoba
Formation, reveals a saurischian dominated ichnofauna consisting of
four sauropod and at least eight theropod trackways. The sauropod
trackways display a medium-wide gauge pattern characteristic of
titanosauriforms, while the theropod trackways can be subdivided into
two distinct morphotypes. One is similar to the ichnogenera Eubrontes
and Megalosauripus, the other (cf. Dromaeopodus) appears to represent
a functionally didactyl dromaeosaur where pedal digit II is
represented only by an oval basal pad. A single swim track is possibly
attributable to a turtle or crocodylian. Such sauropod-theropod
dominated ichnofaunas are consistently typical of the red-bed
tracksites in the region and useful for characterizing a fauna that is
otherwise poorly known from body fossils. The stratigraphic position
and late occurrence of the (typical Jurassic) Eubrontes-Megalosauripus
morphotype is well known from other Cretaceous localities in China and
seems to reflect a peculiarity in the theropod faunas of East Asia.