Radiocarbon dating of prehistoric hearths in alpine northern Sweden: problems and possibilities

The chronology of prehistoric Sami settlement sites has previously been established by conventional radiocarbon dating of bulk charcoal samples associated with hearths from sunken hut floors (stállo-foundations). Here we present results of a comprehensive dating exercise of stállo-foundations in the alpine area of northern Scandinavia using Accelerator Mass Spectrometry (AMS) radiocarbon dating of charcoal. Over a 3 km² study area, AMS calibrated ages of hearth charcoal from 22 stállo-foundations across 12 sites securely date these features to between cal. AD 640 and AD 1180. Only small variations in age were found between charcoal samples from different areas of a given hearth. Statistical analysis of all the charcoal AMS radiocarbon dates obtained reveals that 12 stállo-foundations across nine sites are contemporaneous and date to the Viking Period (AD 800–AD 1050). The tightly constrained AMS-based chronology of stállo-foundations contrasts with the existing chronology based on conventional radiocarbon analysis, which places these features within a significantly greater time-frame of between AD 600 and AD 1900, with most dates ranging between AD 800 and AD 1350.This discrepancy is likely to result from the necessity of collecting composite hearth charcoal particles, which may originate from different phases of occupation, in order to achieve the required final carbon content for conventional radiocarbon analysis. We argue that the new AMS-based radiocarbon chronology of stállo-foundations presented here supersedes the existing chronology based on conventional (Gas Proportional counting) radiocarbon analysis and we advocate the use of AMS radiocarbon dating in future hearth investigations.     

MIGRATION AND SELF‐SELECTION: MEASURED EARNINGS AND LATENT CHARACTERISTICS*

ABSTRACT Research in regional and labor economics has established that economic incentives play a significant role in the process of internal migration. The most common approach is to view migration as a form of human capital investment undertaken by individuals who expect to benefit from the standpoint of increased earnings. One of the central concepts in these models is self‐selection. Individuals who self‐select the option of migration tend to differ from the nonmigrant population in ways that are not measured in most data sets. The contribution of this paper is in its distinction between two aspects of migrant selection. On one hand, some workers possess unmeasured traits that might simultaneously affect their wages and their propensity to engage in risky human capital investment such as migration. On the other hand, measured earnings might exert a direct effect on migration. Based on samples of employed Swedish males and females at two points in time, this study seeks first to examine whether migration between the two periods occurs in the presence of correlation between unmeasured factors present in both earnings during the first period and the subsequent decision to migrate. Second, it looks for an explicit role of earnings per se in the migration decision. Results of the study provide support for selection based on unmeasured traits for both genders. For females, there is also evidence of selection based on measured earnings.     

Employment Opportunities,Wages and International Migration in Sweden 1970–1989

In this study I focus on the impact of aggregate labor turnover and regional labor market conditions on gross in- and out-migration within the framework of a neoclassical flexible-wage (equilibrium) model and a fixed-wage (labor-market disequilibrium) model. Using annual panel data on internal gross migration flows in Sweden from 1970 to 1989, I find that regional differences in employment opportunities have the expected effects on migration. The empirical relationship between real wages and gross migration flows is found to be less congruent with theory implications, indicating that compensated regional income prospects are equalized primarily via the interaction between employment opportunities and gross migration flows. Cyclical changes in hirings are shown to have a robust and strongly significant positive scale effect on migration.     

Deglaciation and Colonization: Pioneer Settlements in Northern Fennoscandia

We present new data on Early Mesolithic settlements in northern Sweden and discuss the process of pioneer colonization. A new set of radiocarbon dates from archaeological sites push deglaciation of northern Fennoscandia further back in time and demonstrate the rapid arrival of pioneer settlers. Environmental data reveal a highly productive early postglacial setting with plant communities unmatched in present ecosystems. The chronological and technological setting supports immigration from the north and northwest with pioneers relying on a long history of enculturating northern subarctic landscapes.