The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

罗布泊盐湖罗北区卤水主要离子平面分布特征

罗布泊盐湖罗北区有着丰富的地下卤水资源,通过野外采集样品,室内试验检测,研究了罗布泊盐湖罗北区表层卤水主要离子的分布特征。采集卤水样品46件,通过分析,表明该区卤水矿化度范围在18.169～389.253g/L,略有中间高四周低的趋势。卤水中的阳离子主要为K+,Na+,Ca2+,Sr2+,B3+;阴离子主要为Cl-,SO24-,HCO3-,Br-,I-。其中K+,Na+,Li+,Cl-,SO24-,B3+的分布及含量均与矿化度呈正相关关系,Ca2+,Sr2+的分布及含量与矿化度呈负相关关系。HCO3-,Li+,Br-,I-,Mg2+的分布及含量与矿化度关系不明显。