The present study aims to identify the timing of the Huashan Grottoes' excavations using the lichenometric dating method. A total of 96 maximum inscribed circle diameters of Rhizocarpon geographicum growing on the ancient architectures and the walls of entrances are measured in the Huashan Grottoes area of southern Anhui, East China. The results show that the period of the grottoes' excavation is estimated to be 450–335 yr BP, or the middle and late Ming Dynasty (1552–1667 AD). The lichenometric dating results are also validated by a lithologic comparison of the grottoes and the surrounding ancient architectures, as well as by the studies on the historical documents and the fragments of ancient porcelain in the grottoes. Furthermore, we infer that the excavation of the inner grottoes might have lasted till the Qing Dynasty (1636–1912 AD), because the lichens chosen for dating are mainly at the grottoes' entrances. The wider significance of this work is that it demonstrates, for the first time, lichenometric dating can be applied in the historical studies on the ancient architectures in East China with a relatively warm and humid climate. 相似文献
When working in the kitchen,her son was always clinging to her body.Though the service may not have been professional it was in fact somehow intriguing.She was Tsamjo. 相似文献
Li, L.-Y., Zhang, X.-L., Yun, H. & Li, G.-X., October 2015. New occurrence of Cambroclavus absonus from the lowermost Cambrian of North China and its stratigraphical importance. Alcheringa 40, xxx–xxx. ISSN 0311-5518.
The problematic Small Shelly Fossil Cambroclavus absonus is described from the Xinji Formation in the Longxian area, which is located near the southwestern margin of the North China Platform. The Xinji Formation, the basal rock unit of the Cambrian in the studied area, yields an assemblage of skeletal fossils that share many common elements with contemporary faunas from South Australia. Sclerites of C. absonus reported herein represent the first occurrence of the species outside Australia, thus extending the palaeogeographic range of the taxon to northern China. To date, palaeogeographic occurrences of Cambroclavus sclerites are restricted to the Peri-Gondwana realm, including South China, Australia, Tarim, Kazakhstan, North China and Western Europe. These occurrences are divided into a Southern Group realm and Northern Group realm. Stratigraphically, Cambroclavus occurs mostly in Cambrian Stage 3 and has three occurrences in Stage 5, separated by Stage 4 in which Cambroclavus has not yet been found. The first appearance datum of Cambroclavus in Cambrian Stage 3 is of importance for regional and inter-regional correlations. In particular, the presence of Cambroclavus absonus in North China allows species-level correlation between North China and South Australia.
Luoyang Li [lly@stumail.nwu.edu.cn], Xingliang Zhang [xzhang69@nwu.edu.cn], Hao Yun [yunhao@stumail.nwu.edu.cn], Early Life Institute and State Key Laboratory Of Continental Dynamics, Department of Geology, Northwest University, Xian 710069, PR China; Guoxiang Li [gxli@nigpas.ac.cn], Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, PR China.相似文献