YANG Yu-qing, YIN Ya-lei, ZHOU Chang-fu Â& WU Wen-hao (2017)
A new specimen of Liaoceratops yanzigouensis from Early Cretaceous Yixian Formation in western Liaoning.
Global Geology 36(3): 663â670 (Chinese edition)
A new specimen of Liaoceratops yanzigouensis is described fromÂ Lujiatun Bed of the Early Cretaceous Yixian Formation in Beipiao, ââwestern Liaoning. The specimen shows the typical characteristics of Liaoceratops; three premaxillary teeth;Â large triangular antorbital fossa; epijugal absent; predentary hooked dorsally; and ventral flange presents along the mandible with several tubercles.Â New morphological information of the rostral has been revealed through the three-dimensional reconstructions based on CT scanning, the rostral is keeled anteriorly and bears a broad vertical crest along its posterior midline.Â The postcranial skeleton of Liaoceratops yanzigouensis is described for the first time. The profile and position of the fourth trochanter is possibly valuable for the classification of basal neoceratopsians.
***NOTE: The Chinese version of Global Geology is usually available with free pdfs at this link. However, the third issue for September has not been posted. on the website, whichÂcurrently is not working quite right.
ZHANG Jia-liang, WANG Qiang, JIANG Shun-xing, CHENG Xin, LI Ning, ZHANG Xin-jun, QIU Rui & WANG Xiao-lin (2017)
Preliminary research on the peculiar taphonomy of the Late Cretaceous Laiyang hadrosauroid fauna in Shandong.
Acta Palaeontologica Sinica 2017 56(2): 214-224
In recent years, five fossil-bearing layers, which mainly contain abundant dinosaur fossils, are found in the massive excavations at Locality 2 of Laiyang, Shandong Province. It is east of the Locality 1 (Young's Tsintaosaurus quarry). The main fossils are hadrosaurids, some of which would be referred to Saurolophinae, with some bones of Tsintaosaurus spinorhinus (Lambeosaurinae). The hadrosaurid elements can be assigned to an assumed adult, subadult, and late juvenile individuals according to their size. These fossil-bearing layers are mainly grey-green or red-brown mudstones. The fossil in these layers are interpreted as having been carried by debris flows and deposited. This indicates two different taphonomic modes. Alive hadrosaurids were swallowed and torn by a sudden debris flow, and the carcasses were carried a short distance and quickly buried. The fossils in this layer are complete but disarticulated, and the ones belonged to a same individual are sited in a small area. The carcasses, natural death or killed by flood or debris flows, which were exposed on the floodplain, were rotted, and broken as fragments by the debris flows during the final burial. The fossils in this layer are mixed by the complete and fractured bones. The taphonomic feature of these fossil-bearing layers indicates that there was a fauna, which was dominated by various hadrosaurids, that lived nearby the lake or river. After the late juvenile individuals joined into the adult groups, the mass mortality, which were caused by the debris flows, killed and quickly buried the fauna.============
HAN Feng-lu, XING Hai, TONG Qian-ming, Corwin SULLIVAN, XU Xing, WU Rui, HU Neng-yong & TONG Guang-hui (2017)
Preliminary study of a diverse dinosaur assemblage from the Upper Cretaceous of Zhuzhou, Hunan Province.
Acta Palaeontologica Sinica 2017 56(2): 225-237
Numerous dinosaur eggs have been discovered in the Upper Cretaceous of South China, but previously documented dinosaur bones are relati- vely rare in these strata and represent a small number of taxa. Here we present the first detailed study of dinosaur body fossils from the Upper Cretaceous Daijiaping Formation of the Tianyuan district, Zhuzhou, Hunan Province, China. This dinosaur assemblage contains diverse taxa, possibly including at least two sauropods, three theropods and one hadrosaurid. Some sauropod material can be tentatively assigned to Diplodocoidea, which represents limited but suggestive evidence that diplodocoids occur in Asia. One sauropod ischium appears to show derived features of Titanosauria, although more evidence is needed to support referral to this clade. The theropod sample consists entirely of teeth, but may include a small coelurosaur (e. g. a dromaeosaurid), a tyrannosauroid and a carcharodontosaurid. Small coelurosaurs and tyrannosauroids are fairly common in the Upper Cretaceous of northern continents, whereas carcharodontosaurids have a comparatively poor record. The multitaxic dinosaur assemblage from Zhuzhou suggests this part of China was home to a richer Cretaceous fauna than previously believed, and may have been one of the last places where diplodocoids and carcharodontosaurids persisted. The Zhuzhou dinosaurs thus have important implications for the study of Asian, and particularly Chinese, dinosaur biogeographic investigation.
JIANG Qin, HE Qing, ZHENG Liu-gen & HU Yi (2017)
Mineral and Elemental Composition of Late Cretaceous Dinosaur Eggs in Qiyunshan Area, Anhui Province and Its Implication for Palaeoenvironmental Analysis.
Rock and Mineral Analysis 36(4): 340-349
The well-preserved dinosaur egg fossilsrecently found in Qiyunshan area, Anhui Province are the key to studying the living environment and the extinction of dinosaur fauna in the Late Cretaceous period. In order to discuss the palaeoenvironment and palaeoclimate , X-ray Diffraction (XRD) , Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES) , and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) were used to analyze the composition of macro minerals, major elements and trace elements of the dinosaur eggshells, egg core and the surrounding rock. The results show that the main minerals of dinosaur eggshells are calcite and quartz whereas the mineral of the interior is the same as the exterior of the eggshell and is mainly quartz. Major elements include Ca,Na, Mg, K , Al, Fe,whereas trace elements include Sr, Zn, B a, A s, T i, V, C r, Co, N i, C u, Mn, Pb, La,U,Ir. The average content of Sr in the eggshells was 6199. 3 X 10~6 , higher than most of the eggshells from Xixia of Henan province and Nanxiong of Guangdong province. The average content of Ir in the eggshells was 59. 6 X 10 ~12. Sr and Ir show an obvious abnormality compared with the background values, which may be caused by absorption of harmful elements during material exchange between dinosaur body and the outside world. The accumulation of As,Mn,and Pb and the lack of Zn may lead to the poisoning of dinosaurs and then extinction. The increased Fe content in the surrounding rock indicates that the palaeoclimate in Qiyunshan area during the Late Cretaceous was dry and hot, and the content of Ir, which has a positive correlation with Fe, increased with the increase of Fe. Moreover,the closer to the Cretaceous-Paleogene (K/T) boundary, the higher is the content of Sr and Ir in the surrounding rock , which may be one of the reasons for the extinction of the dinosaur fauna in the area. This conclusion provides a basis for the study of the living environment of the dinosaur fauna in Qiyunshan area.