A theropod–sauropod track assemblage from the ?Middle–Upper Jurassic Shedian Formation at Shuangbai, Yunnan Province, China, reflecting different sizes of trackmakers: Review and new observations

摘要: Abstract A dinosaur tracksite at Hemenkou (Shuangbai County, Yunnan Province) in the ?Middle–Upper Jurassic Shedian Formation that consists mainly of gray-purple feldspathic quartz sandstones was previously reported incorrectly as being Lower Cretaceous Puchanghe Formation. The previous assignment is also inconsistent with two regional geological maps. Although mostly yielding poorly preserved tracks, site nevertheless indicates a diversity theropod and sauropod trackmakers partly consistent Late body fossils from region. Purported ornithopod are re-evaluated here those theropods. tracks trackways show distinct similarities to Grallator – Eubrontes plexus can be subdivided into three morphotypes may reflect different pes anatomy and/or substrate conditions. Two sizes (small, large) indicate presence size classes or species this area Jurassic. Similarly, document differently sized (small–medium–large) showing typical wide-gauge ( Brontopodus ) pattern. track record first evidence theropods ?Middle–Late central Yunnan, whereas suggest relation coeval basal eusauropods known region by skeletal remains.