ESR dating of the Donggutuo Palaeolithic site in the Nihewan Basin, northern China

The fluvio-lacustrine sequences in the Nihewan Basin, northern China, provide important terrestrial archives about Palaeolithic settlements and, therefore, about early human occupation in high northern latitude in East Asia. Here we present detailed ESR dating of the Donggutuo Palaeolithic site, located in this basin. Four levels A, B, C and E of the Donggutuo archaeological layer yield ESR ages ranging from 1060±129 ka to 1171±132 ka with a mean of 1119±132 ka. The ages are consistent with the paleomagnetic data, which show that the Donggutuo Palaeolithic site lies just below the onset of the Jaramillo normal subchron (0.99–1.07 Ma). Furthermore, our results indicate that the reliable ESR dating range of bleached quartz using Ti-Li centre can be effectively extended to 1100 ka and the Ti-Li centre was zeroed before the last deposition, which requires improvement of the understanding of the bleaching mechanism conditions.     

Spatial segregation and urban structure

In this paper, we develop a model of spatial segregation mediated by competitive land prices. Agents of two groups consume city land and benefit from social interactions. Because of cultural or ethnic differences, intragroup interactions are more frequent than intergroup ones. When group sizes differ, population groups sort into distinct neighborhoods. We characterize two‐ and three‐district urban structures. For high population ratios or strong intergroup interactions, only a three‐district city exists. In other cases, multiplicity of equilibria arises. Both groups generally rank these equilibria differently. However, when group sizes are similar, all individuals agree on which spatial equilibrium is best.     

New evidence for Upper Palaeolithic small domestic dogs in South-Western Europe

Osteoarchaeology and genetics agree that the earliest dog domestications took place during the Upper Palaeolithic. However, they partially disagree about the process of domestication. The former indicated multiple origins, when some of the results of the latter suggested that dogs mainly came from a Chinese centre of domestication. In this study, we describe and discuss new evidence for Late Glacial small dogs in the South-West (Pont d’Ambon and Montespan) and North of France (Le Closeau). Special attention was paid to the possibility of miss-identification between small early dogs and dholes (Cuon alpinus), a middle-sized Canidae, the size of which can be similar to early small dogs. Detailed analyses of the archaeological contexts alongside that of taphonomy, morphoscopy, morphometry and pathology, identified 49 small canid remains from the three sites. They allowed us to exclude the presence of dholes and to conclude that they were all small Upper Paleolithic dogs. These, together with other more sparse discoveries, confirmed the presence of Western European Upper Paleolithic Small (WEUPS) dogs from, at least, the Middle Magdalenian to the end of the Epipaleolithic (i.e. 15,000–11,500 cal BP). As they are contemporaneous with the much larger Russian Upper Paleolithic dogs, they plea for several Euro-Asian origins for Late Palaeolithic dogs.     

Characterization and origin of black and red Magdalenian pigments from Grottes de la Garenne (Vallée moyenne de la Creuse-France): a mineralogical and geochemical approach of the study of prehistorical paintings

Pigments sampled from wall paintings and from crayons taken on the floor, at the Grottes de la Garenne (Saint-Marcel – Indre, France) have been analyzed and characterized by infrared spectroscopy, Raman micro-spectroscopy, X-ray diffraction, ICP/MS and analytical TEM. The red pigment used for the wall paintings is mainly composed by hematite, clays, carbon matter and carbonates. Results on the red pigments show that the compositions of the paintings are similar to that of some crayons. Regarding these analyses, their origin is compatible with local siderolithic facieses. Analysis of black pigments shows that they are made of cryptomelane, pyrolusite, clays, carbonates and carbon matter. It shows also that paintings and some crayons compositions are compatible. On the contrary of red pigments, the origin of black pigments is probably allochtonous. Indeed, the traces of thallium detected in cryptomelane, the cerium anomaly and the absence of iron are not compatible with local facieses or other sites from the French Massif Central.     

Combined dating methods applied to building archaeology: The contribution of thermoluminescence to the case of the bell tower of St Martin’s church,Angers (France)

St Martin’s church, Angers, is emblematic of the problems raised in pre-12^th century history of architecture.     

ON THE IMPACT OF COMPETITION ON TRADE AND FIRM LOCATION

We study how the level of trade costs and the intensity of competition interact to explain the nature and intensity of trade within a given industry and the location of firms across countries. As trade costs decrease from very high to very low values, the global economy moves from autarky to two‐way trade, through one‐way trade from the larger to the smaller region. By exploring the intensive and extensive margins of exports, we investigate how the intensity of trade reacts to the degree of competitiveness. Furthermore, when firms are free to change location, they flow from the small to the large country, and the larger country is always a net exported on the manufactured good. Firms located in the big country have a bigger size than those located in the small one. Under one‐way trade, the relocation of firms changes their attitude toward export.     

Multiple origins of Bondi Cave and Ortvale Klde (NW Georgia) obsidians and human mobility in Transcaucasia during the Middle and Upper Palaeolithic

Using PIXE four types of elemental compositions were found among obsidian artefacts from the Bondi Cave and Ortvale Klde, Middle to Upper Palaeolithic sites in NW Georgia. One of those types corresponds to obsidians from the Chikiani source, whose compositions were determined with a very good agreement by PIXE and ICP-AES/MS. The composition of Chikiani obsidians is remarkably constant despite K–Ar and ³⁹Ar/⁴⁰Ar extrusion ages from ca 2.4 and 2.8 Ma. The compositions of two other groups of obsidian artefacts are similar to source materials from eastern Anatolia and Armenia, in particular Ikisdere, Sarikamis, Gutansar, and Hatis. Obsidian is only a minority component in the lithic assemblages at the Bondi Cave and Ortvale Klde. Both Neanderthal and Modern Human populations used obsidian in particular from Chikiani. Considering that the shortest walking distance to this nearest source is at minimum of about 180 km, and to other potential sources of more than 350 km it is suggested that this material reached these two sites mostly, if not exclusively, by a series of ‘down the line’ exchanges.