Ancient DNA analysis of desiccated wheat grains excavated from a Bronze Age cemetery in Xinjiang

Wheat has been one of the most important crop in Eurasia since the Neolithic period. Understanding the spread of wheat cultivation is crucial to understanding the spread of agriculture as a whole and the interactions between prehistoric populations across the Eurasian continent. However, the routes by which wheat cultivation spread eastwards have been poorly understood to date, due to the scarcity of plant remains recovered from archaeological sites. Desiccated wheat grains excavated from the Xiaohe cemetery in Xinjiang, and dated to the early Bronze Age, show excellent DNA preservation. Here we present an ancient DNA (aDNA) analysis of wheat (Triticum sp.) grains excavated from Xiaohe and provide the first definitive evidence for bread wheat in China during the Bronze Age. The nuclear ribosomal DNA internal transcribed spacer regions (ITS1 and ITS2) and the intergenic spacer region (IGS) were amplified. The IGS region within the D genome of wheat has a 71 bp insertion that is absent from corresponding regions in the A and B genomes. The results showed that the Xiaohe wheat showed most sequence similarity to hexaploid bread wheat (Triticum aestivum), including the characteristic insertion into the D genome. The presence of bread wheat at the Xiaohe cemetery is discussed in relation to it having spread into Xinjiang by the Bronze Age, providing new insight into the origins of bread wheat in East Asia.     

Origin of dolomites in the Cambrian (upper 3rd‐Furongian) formation,south‐eastern Sichuan Basin,China

The origin of large‐scale ancient dolomite is one of the most hotly debated topics in sedimentology. The Loushanguan group of the upper 3rd‐Furongian Cambrian series on the south‐eastern margin of the Sichuan Basin consists of numerous dolomites, and the origins of these dolomites have never been reported previously although they are probably good hydrocarbon reservoirs. Based on a systematic analysis of petrology, fluid inclusions, carbon and oxygen isotopes, trace elements and rare earth elements (REEs), this study provides some unique insights into the origins of the dolomites. Four dolomite types have been identified in the study area: dolomicrite, fabric‐retentive oolitic dolomite, fabric‐obliterative dolomite and saddle dolomite cement. In the dolomicrite and fabric‐retentive oolitic dolomite, high Sr contents (with respect to the fabric‐obliterative dolomite) and the lack of two‐phase aqueous inclusions suggest that they formed at shallow‐to‐intermediate burial depths at low temperatures (<50–60°C). Carbon and oxygen isotopes and seawater‐like REE+Y characteristics of the dolomicrite and fabric‐retentive oolitic dolomite indicate that the dolomitizing fluids were evaporated seawater or slightly modified seawater. The obliteration of the original sedimentary fabric and relatively low δ¹⁸O and Sr values compared to the fabric‐retentive dolomite indicate that fabric‐obliterative dolomite formed at intermediate‐to‐deep burial diagenesis. The chemical composition approaches pure dolomite and the REE+Y characteristics are similar to those of the fabric‐retentive dolomite, indicating that the fabric‐obliterative dolomite was formed due to the recrystallization of the previously formed fabric‐retentive dolomite at elevated burial depths and temperatures. High fluid inclusion homogenization temperatures (115–150°C), low δ¹⁸O values, nonplanar‐a crystals and seawater‐like REE+Y characteristics suggest that saddle dolomite cement formed by reprecipitation of dolomite that related to seawater‐driven and deep burial fluid. In the study area, dolomicrite and fabric‐retentive oolitic dolomite may have been formed by penecontemporaneous or seepage‐reflux dolomitization during early‐stage diagenesis. Subsequently, during progressive burial, most of the fabric‐retentive dolomite was converted into fabric‐obliterative dolomite by recrystallization. This study confirms that fabric‐obliterative dolomite was the main dolomite type, and although deeply buried, these Cambrian dolomites most likely have preserved coeval seawater geochemical signals.     

Multi‐analytical Studies of the Lime Mortars from the Yanxi Hall in the Yangxin Palace of the Palace Museum (Beijing)

For centuries, the architecture of the Palace Museum represented the highest standard of Chinese architecture. The Yangxin Palace of the Palace Museum consisted of 18 masonry buildings built using bricks, wood, roof tiles and various mortars. In 2016, a five‐year project was initiated to work on the maintenance and restoration of the Yangxin Palace buildings. The characterization of the construction materials has become of primary importance, in order to obtain information about the raw ingredients and building technology of the mortars, and the history of possible previous restorations. In this paper, 12 different samples representing three types of mortar‐based materials—namely, jointing mortars between the bricks on the wall, and surface plasters as well as mortars used on the roof—were collected for analysis from the Yanxi Hall of the Yangxin Palace. Analysis into the composition, grain‐size distribution, organic and fibre additives and testing of the mortar density and water absorption were performed. Starch, protein and plant fibres were identified in some of the samples. Brucite, mullite and ettringite were detected within most mortars on the roof, possibly originating from the furnace slag added into the raw materials for restoration purposes. The analytical results will serve as a critical reference for the maintenance and restoration of the buildings in the Yangxin Palace.     

Urban redevelopment and residential location choice: Evidence from a major earthquake in Japan

We examine residential location choice behavior in a metropolitan area of Japan that experienced seismic damage. We find that the internal structure of the affected area was reshaped, although, in the long term, its total population size was robust to this temporary shock. Before the earthquake, the population was evolving toward a state of equilibrium with dense locations in the core facing redevelopment barriers and, therefore, stagnation. In contrast, the periphery was becoming increasingly appealing and thus growing. Seismic damage allowed for redevelopment at higher density, making the adjusted equilibrium with dense locations grow again. In summary, the initially expanding periphery stagnated as an unintended consequence of urban redevelopment.     

Early Darriwilian graptolites from central and western China

Taxonomic restudy of Early Darriwilian graptolites from the Yangtze region, Chiadam and Alxa, has enabled a precise correlation of the Undulograptus austrodentatus Zone (including two subzones) across the three regions, and with the Darriwilian GSSP at Huangnitang in the Jiangshan-Changshan-Yushan (JYC) area. Based on specimens from 17 localities in the Yangtze region, the Exigraptus clavus and Undulograptus austrodentatus zones are recognised as replacements respectively of the Undulograptus sinodentatus (Lower) and U. austrodentatus (Upper) zones of Mu et al. (1979). The U. sinicus Subzone, the upper subzone of the U. austrodentatus Zone, is also recognised from the Sichuan-Guizhou area of the Yangtze region. Two subzones of the U. austrodentatus Zone have also been identified from the Chiadam region with more diverse graptolite fauna. The U. austrodentatus Zone fauna also occurs in the Alxa region. A general pattern of changing graptolite diversity from platform through basinal slope to deep basin is proposed, based on early Darriwilian bio- and lithofacies changes from the Yangtze Platform through the Jiangnan belt to the Zhujiang basin. The graptolite diversity increased with water depth and more off-shore setting. Key graptolite species are illustrated.     

热河普陀宗乘之庙乾隆朝建筑原状考

清乾隆年间在热河修建的普陀宗乘之庙,经清中晚期变迁及20世纪修缮工程,建筑现状与乾隆朝已有较大出入。本文基于田野考察、修缮工程师访谈、清宫档案文本和历代图像资料,对该庙乾隆朝的建筑原状进行了细致考证,包括已塌毁的无量福海殿、九间房,形制发生改变的大红台群楼、御座楼区域、平台殿,非原始设计而属后续添建的塔罩亭、千佛阁以及档案名称失载或功能被误判的"呀达噶楼"、"哑巴院"等组成部分,捋清了该庙原初形制、变化时间节点和称谓指代。对原状的考证为进一步的建筑史研究提供了基础。     

20世纪的湖州画坛及书画家

湖州位于苏浙皖三省交界,东邻上海,南接杭州,西依天目山,北濒太湖,地理山水之胜,无以复加。尽管在行政版图上,如今的湖州无非一个地级市,一块巴掌大的小地方,但如果悬一张文化艺术版图,其则是一个耀眼的高地,明亮的坐标。其历史的漫长、人文特别是艺术传统的深厚,于生活其中的     

唐武惠妃石椁纹饰初探

陪葬敬陵的唐武惠妃墓石椁规模宏大,内外雕刻着精美的纹饰,其中的人物、乐舞、神兽、动植物纹带有当时中西文化交流盛期的明显特征,也反映出墓主人的佛教信仰倾向,以及安排武惠妃葬式葬仪者的思想与感情,为研究唐代宫廷文化、宗教和文化融合等提供了珍贵材料。     

西周君陵区考辨

东周王陵的分区及其属性研究是东周考古的一个重要部分,西周作为东周时期分封于王城的一个小诸侯国,它的陵区必位于东周王城遗址区内。本文从考古发掘的资料入手,结合历史文献,从年代、规格、规模及内涵等诸方面,论证了洛阳西郊M1～M4战国墓即是西周君陵区。