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Abstract The ability to detect pregnancies from archeological human teeth using Tooth Cementum Annulation (TCA) method continues to challenge bioarcheologists. We discuss the serious methodological limitations of the TCA technique when applied to studying fertility in the past. This discussion is prompted by a recent publication on these two topics (see Penezic et al., 2020) which we argue suffers from fundamental factual and methodological flaws. We suggest the claims made in that paper lack the level of supporting evidence required. We conclude that many serious published confounding difficulties exist and must be accounted for by researchers wishing to infer most life history parameters, especially fertility related ones, from archeological samples.

Abstract Archaeological starch spherulites discovered at the submerged 23,000-year-old site of Ohalo II, Sea of Galilee, Israel, provide a new line of archaeobotanical evidence for plant food processing. Six-hundred and thirty-two (632) starch spherulites were recovered from four stone implements. The analysis of starch spherulites from reliable archaeological contexts is a breakthrough that will potentially allow the identification of a range of plant processing and wet cooking activities. Our work provides a baseline for starch spherulite extraction and identification protocols. They were confirmed as spherulites using Lugol's iodine confirmation and the optical properties of the polarisation cross when rotated on a microscope stage under cross-polarised light. Their identification as starch spherulites was based on their archaeological context, size range and optical (polarized light and SEM) characteristics (including partial iodine uptake). Following our promising results, we encourage researchers to describe archaeological starch spherulite morphology and elemental characteristics in as much detail as possible. Future experimental archaeology work may find that these details provide evidence for how starch spherulites were formed through plant processing and cooking techniques.

Abstract The Norse Greenlanders were dependent on wood for making houses, boats, utensils, tools and as fuel. Due to Greenland's northerly latitude and short, cool summers, the local woody taxa include relatively few species, most of which are low-growing shrubs. Consequently, it has been argued that import of timber was necessary to meet the wood requirements of the Norse Greenlanders. The taxa of archaeological wood assemblages from five Norse sites in Greenland, the episcopal manor Garðar/Igaliku (O47), Tatsip Ataa Killeq (O172), Tasilikulooq (O171), Narsaq (O17a) and Garden under Sandet (GUS) were analysed to determine whether the wood was native, import or driftwood. This paper demonstrates that farmers in Greenland used mainly driftwood and native wood, while high-status sites like Igaliku had access to sporadic timber imports from mainland Europe and North America. Furthermore, the proportions of driftwood taxa from the Norse settlements are more or less the same as of Inuit and pre-Inuit cultures in Greenland and the Smith Sound. These results suggest that the Norse Greenlanders were not reliant on imported wood but were in fact mostly self-sufficient in regard to their timber resources.

Abstract Hacksilber facilitated trade and transactions from the beginning of the second millennium BCE until the late fourth century BCE in the southern Levant. Here we demonstrate the use of new, data-driven statistical approaches to interpret high-precision Pb isotope analysis of silver found in archaeological contexts for provenance determination. We sampled 45 pieces of Hacksilber from five hoards (Megiddo Area H, Eshtemoa, Tel Dor, ʿEn Gedi, and Tel Miqne-Ekron) and combined our data with recent literature data for the same hoards plus five more (Beth Shean, Ashkelon, Tell Keisan, Tel ʿAkko, and ʿEn Ḥofez) thus covering silver from the Late Bronze Age III (c.1200 BCE) to the end of the Iron Age IIC (586 BCE). Samples were taken by applying a new minimally destructive sampling technique. Lead was extracted using anion-exchange chromatography, and Pb isotopic compositions were measured by MC-ICP-MS. Data were treated using a new clustering method to identify statistically distinct groups of data, and a convex hull was applied to identify and constrain ore sources consistent with the isotopic signature of each group. Samples were grouped by minimizing variance within isotopic clusters and maximizing variance between isotopic clusters. We found that exchanges between the Levant and the Aegean world continued at least intermittently from the Late Bronze Age through to the Iron Age III, demonstrated by the prevalence of Lavrion (Attica), Macedonia, Thrace (northern Greece), southern Gaul (southern France), and Sardinia as long-lived major silver sources. Occasional exchanges with other west Mediterranean localities found in the isotopic record demonstrate that even though the Aegean world dominated silver supply during the Iron Age, exchanges between the eastern and the western Mediterranean did not altogether cease. The mixture of silver sources within hoards and relatively low purity of silver intentionally mixed with copper and arsenic suggest long-term hoarding and irregular, limited supply during the Iron Age I.

Abstract The true purity of Roman silver coinage was hidden by enriching the surfaces of the coins. The question investigated here is whether Roman gold coins were also surfaced enriched. Two non-destructive techniques were employed to do this: X-ray fluorescence (XRF) and a ‘newer’ technique, muonic X-ray emission spectroscopy (μXES). For the latter, the momentum of the muons is controlled, allowing for the composition of the coin to be determined at various depths. Here we show that there is no surface enrichment of the Roman gold coins analysed. Furthermore, we show that XRF and μXES return congruent results at the near surface. This all supports the integrity of surface level analyses of Roman gold coins. We then discuss the broader applicability of our muon technique to the further study of Roman gold coinage, to the cultural heritage sector and to archaeological scientists more generally.

Abstract The present study investigates for the first time a largely forgotten pyrotechnology for manufacturing artificial millstones for Persian windmills and querns from Islamic period Sistan, a region in southeastern Iran. The unusual characteristics of these materials result from melting a sand-clay mixture at high temperatures. A unique experimental and multianalytical method was developed to understand the heating-cooling regime for manufacturing artificial millstones and other technical details of their production. According to chemical and microstructural analyses, these materials were melted between 1150 °C and 1250 °C and kept there for a period of 14–20 h, to be subsequently cooled down by 10–50 °C/h. Our experimental results for reproducing the microstructure of these objects show that any other temperature regime would be unsuccessful for manufacturing a functional millstone for these huge windmills which are usually referred to as the first wind turbines in the history of technology.

Abstract The insufficient attention traditionally paid to the complex mortuary biographies of megalithic graves has long obscured a significant amount of synchronic and diachronic information. The Rioja Alavesa region of north-central Iberia holds a number of megalithic graves with large skeletal assemblages that can generally be ordered by internal stratigraphy and/or relatively fine-grained radiocarbon chronologies, providing a rare opportunity to assess the potential of such information. Here, we undertake stable carbon and nitrogen isotope analyses of 125 human and seven animal bone collagen samples from six late prehistoric megalithic graves (La Cascaja, El Sotillo, San Martin, Alto de la Huesera, Chabola de la Hechicera and Longar) which, together with 107 previously published Late Neolithic/Early Chalcolithic (ca. 3600-2900 BC) bone collagen samples (100 humans and six animals) from the same tombs, are used to explore subsistence trends over time. This approach provides a means to address the socio-economic response of northern Iberian megalithic communities to the cultural and climatic changes occurring in late prehistory. Isotopic data are contextualized using palaeoenvironmental and osteoarchaeological information. The results show a significant shift in diet between the late Middle Neolithic and the Late Neolithic/Early Chalcolithic that coincides with marked changes in burial practices that are likely related to the transition from mainly pastoral to mixed farming economies. There may also be a change in subsistence between the Late Neolithic/Early Chalcolithic and the following periods, suggested by differences in δ15N values between the layers of the Alto de la Huesera megalithic grave, as well as in population and funerary dynamics. By contrast, an apparent continuity in subsistence is seen, at least isotopically, from the Middle Chalcolithic to the Bronze Age, despite clear changes in beliefs and socio-economic practices. These findings support the existence of substantial asynchronous changes in lifeways and ideology among Iberian megalithic groups and challenge the traditional idea of a long and uniform stability in late prehistoric northern Iberia.

This paper presents a case study on Early Medieval burial practices using AGNES, an intelligent search engine for Dutch archaeological grey literature. Traditionally, it is assumed that cremations phased out at the start of the Early Middle Ages, when the inhumation practice became more numerous. However, recent research (Lippok, 2020) shows that cremations might be more prevalent than previously assumed. Due to research efforts being concentrated on furnished inhumations, cremations and other types of burials have not received their share of research interest. It is suspected that unknown Early Medieval cremations may be found in grey literature research reports. The rapidly growing document collection requires more efficient methods to search through this big data, as manual searching is too time intensive.AGNES uses machine learning to allow searching on archaeological concepts (such as time periods and artefacts) in full texts, solving common problems with synonymy and polysemy. This paper describes a controlled search for Early Medieval cremations in the Netherlands, and a comparison of the new information uncovered from the reports to prior knowledge on the topic. The queries resulted in 2541 hits. Twenty-three Early Medieval cremations that were previously unknown to experts were uncovered, and 31 (of 77) known sites were identified. Forty-one possibly interesting documents were noted, where it was not clear from the report if Early Medieval cremations were present. 2446 documents were not relevant to the study for various reasons.The 23 new sites are an increase of 30% over the existing knowledge of experts. In the last 20 years only nine new sites featuring Early Medieval cremations were discovered, so being able to add another 23 is a major development. Adding previously unknown Early Medieval cremations to the dataset challenges the existing bias for inhumation graves, and supports striving towards viewing the Early Medieval burial repertoire as more heterogeneous and representative. This indicates that AGNES is useful for archaeological research, and the uncovered information can lead to a more cohesive view of the past.​​​​​​​