The Phenomenon of the Influence of Gold Melt on Microinclusions of Platinum Group Minerals in Ancient Gold Objects

This study focuses on microinclusions of platinum group minerals (PGMs) in gold objects from the South Urals and North Black Sea archaeological sites. We demonstrate for the first time that melting of gold during archaeometallurgical work affects PGM microinclusions. Desquamation of primary PGM microinclusions with 28–55 wt% Os in the melt and their oxidation by hot air microbubbles results in the formation of secondary particles with 1–20 wt% Os around the primary inclusions. We conclude that the composition only of primary PGM microinclusions in ancient gold products is comparable to the composition of those from natural sources.     

Early Maya Ritual Practices and Craft Production: Late Middle Preclassic Ritual Deposits Containing Obsidian Artifacts at Ceibal,Guatemala

This article examines Preclassic Maya ritual practices and craft production by means of a study of ritual deposits containing obsidian artifacts dated mostly to the late Middle Preclassic period (700–350 b.c.) at Ceibal, Guatemala. New ritual practices developed at Ceibal during this period, possibly through political interactions and negotiation involving emerging elites and other diverse community members. Common objects in ritual deposits in the public plaza shifted from greenstone celt caches to other artifacts, including those made of obsidian. The inhabitants of Ceibal engaged in various kinds of craft production, including the manufacture of obsidian prismatic blades. They also conducted public rituals in the Central Plaza, depositing exhausted polyhedral obsidian cores and other artifacts with symbolic significance in caches and as offerings in incipient elite burials and interments of sacrificed individuals. These cores clearly demonstrate the use of a sophisticated blade technology. Like greenstone objects, exhausted polyhedral obsidian cores deposited in cruciform arrangements along the east–west axis of the central E-Group plaza were used as symbols and markers of the center and four cardinal directions within the Maya cosmos. Public rituals were important for creating collective identities and for processes of political negotiation within the community. Emerging elites likely came to play an increasingly important role in public rituals as principal performers and organizers, setting the stage for later public events centered on rulers.     

处置群体性突发事件应注意的几个问题

当前,一些地方群体性突发事件屡有发生,严重影响了社会稳定,干扰了全面建设小康社会的顺利进行。总结处置这类事件的经验教训,明确今后工作中应注意的问题已是当务之急。     

Trilobite biofacies of the Cambrian-Ordovician boundary interval in northern North America

Regional biofacies analysis has been neglected in biostratigraphic studies of the Cambrian-Ordovician boundary interval. Cluster analysis of relative abundance data of trilobites in thirty-seven large collections from ten localities in North America outlines eleven biofacies in the mid-Trempealeauan to early Tremadocian interval. The biofacies are largely lithofacies-specific and are differentiated at generic and familial levels. The composition of trilobite zonal associations in the boundary interval is controlled principally by the sequence of biofacies. Available trilobite zonal schemes can be used only within single lithofacies. The biofacies patterns and faunal dynamics across the upper boundary of the Ptychaspid Biomere do not support hypotheses requiring catastrophic events. In coherence and geographic distribution, Late Cambrian trilobite biofacies are similar to post-Cambrian benthic biofacies.     

A space for feminist mentoring: the role of Geographic Perspectives on Women (GPOW) specialty group in higher education

Abstract

Higher education and organizations within academic disciplines are important spaces for mentoring and other forms of networking. These spaces, however, are often situated in environments that limit equitable and inclusive opportunities for early career and underrepresented scholars to effectively engage in mentoring. This paper contributes to critical feminist scholarship that examines how organizations in higher education can offer supportive mentoring spaces for women, early career faculty, and scholars from diverse backgrounds. The analysis focuses on the Geographic Perspectives on Women (GPOW) Specialty Group of the American Association of Geographers (AAG) as a space for faculty, students and other geographers to enhance their professional and personal success. Our analysis draws from the results of an international survey, a focus group discussion, and reflexive participation of feminist geographers aligned with this specialty group. We examine the ways in which this academic organization, and the informal and formal networks it cultivates, attempts to foster an anti-oppressive mentoring community of feminist geographers. We also analyze how these networks are shaped by and embedded in neoliberal institutions in the discipline of geography and higher education as a whole. This discussion offers important insights to growing research and initiatives that support mentoring for women, feminists, and others concerned with building more inclusive and socially just spaces in academia.     

“认知—情感—整体”三维视角下的遗产旅游地形象感知研究——以湘江古镇群为例

以湘江古镇群互联网旅游数据为研究对象，采用文本分析、主题分析和情感分析等方法，借助旅游地形象“认知—情感—整体”三维模型对遗产旅游地形象感知进行了探索。结果表明：①游客对湘江古镇群的认知形象以自然、场所/地域和活动为主，非物质形态记忆重心由饮食文化向历史文化偏移，环境生态记忆由模糊山水环境生态向具象历史文化空间记忆发展。②游客对古镇旅游设施与饮食文化积极感知最为强烈，影响湘江古镇群的消极情感形象最为重要的因素是门票价格贵、性价比不高等。③游客对湘江古镇群推荐与重游意愿普遍偏低，整体情感呈负性与正性情绪两极分化，正性情绪占比较高。     

Early Carboniferous Siphonodella (Conodonta) faunas from eastern Australia

Early to Middle Tournaisian conodont faunas with Siphonodella from ten sections in eastern Australia, between Gloucester in New South Wales and Rockhampton in Queensland, may be referred to the following ‘standard’ zones; 1 sulcata, 2 upper duplicata, 3 sandbergi, 4 lower crenulata and 5 isosticha-upper crenulata, in ascending order. In eastern Australia the first occurrences of Gnathodus cuneiformis, G. delicatus, G. typicus and Protognathodus cordiformis, near the base of the lower crenulata zone, are significantly earlier than in Europe and North America. Consequently the base of the isosticha-upper crenulata zone in eastern Australia is defined by the first appearance of G. punctatus rather than that of G. delicatus. On the present evidence it is difficult to reconcile some brachiopod and conodont occurrences in the Early-Middle Tournaisian of eastern Australia.

Seventeen discrete conodont species are discussed, four of which are described informally: Dinodus sp. nov. A, Dinodus sp. nov. B, Pinacognathus sp. nov. A, and a species of Siphonodella transitional between S. cooperi and S. crenulata.     

Artifacts that speak for themselves: Sounds underfoot in Mesoamerica

Previously overlooked in archaeological research, natural sounds emitted from the underground affect humans and culture. In this paper, it is suggested that noises generated by subterranean ground movement, water, wind, and wildlife are a reason why residents in Mesoamerica perceive caves, waterholes, limestone sinks, and mountains as sacred. Too, a mental grasp of the sounds, conceptualized as anthropomorphized voices and music, may have been employed as an ideological basis for authority in Maya society. Support is shown using examples of ethnohistory, ethnography, and archaeology. Called for is the systematic collection and study of underground sounds, as artifacts, to define the noises as possible use determinants in ritual venues and settlement sites. Their potential importance as early warning devices for destructive agents in the natural environment suggests that an understanding of the noises and their regard by residents in the region could contribute to theory-building in anthropology, particularly in issues of human-environment relations, and sociocultural development.     

Metriorhynchid crocodylomorphs from the lower Kimmeridgian of Southern Germany: evidence for a new large-bodied geosaurin lineage in Europe

Abstract

Over the last two centuries, numerous exquisitely preserved thalattosuchian crocodylomorph skeletons have been found in the Jurassic strata of Southern Germany. While the majority of these specimens occur in Toarcian and upper Kimmeridgian–lower Tithonian deposits, thalattosuchian remains are otherwise rare in strata representing different stages of the Jurassic. Here, we describe skeletal elements from two large-bodied thalattosuchians attributable to the family Metriorhynchidae – these were recovered from lower Kimmeridgian sediments in Bavaria and Baden-Württemberg, respectively. These new metriorhynchid fossils are closely comparable in both stratigraphic age and dental morphology, and thus may be congeneric. Furthermore, our phylogenetic analysis suggests affinity with metriorhynchid remains from France, Switzerland, and the UK. We interpret these taxa as members of an as-yet unnamed geosaurine metriorhynchid lineage (herein termed the ‘E-clade’) from the Kimmeridgian and Tithonian of Europe, which appears to be related to species of Torvoneustes from England and Mexico, and Purranisaurus potens from Argentina, collectively contributing to ‘Subclade T’ of the tribe Geosaurini. Finally, the metriorhynchid material described herein suggests preservation as a ‘bloat and float’ carcass that underwent diagenetic dispersal within a limestone-marl-alternation deposited in an off-shore epicontinental marine environment.

Pascal Abel [pascal.abel@senckenberg.de], Senckenberg Center for Human Evolution and Palaeoenvironment, Eberhard-Karls-University Tübingen, Sigwartstraße 10, 72076 Tübingen, Germany; Sven Sachs [sachs.pal@gmail.com], Naturkunde-Museum Bielefeld, Abteilung Geowissenschaften, Adenauerplatz 2, 33602 Bielefeld, Germany; Mark T. Young [marktyoung1984@gmail.com], School of GeoSciences, Grant Institute, University of Edinburgh, James Hutton Road, Edinburgh, EH9 3FE, UK.