Archaeological Reasoning Research Articles

The Mandate for Speculation: Responding to Uncertainty in Archaeological Thinking

The Mandate for Speculation: Responding to Uncertainty in Archaeological Thinking

Microhistory, Conjectural Reasoning, and Prehistory: The Treasure of Aliseda (Spain)

Abstract This contribution delves into the ways of archaeological reasoning based on material remains, tackled as minute physical traces or signs capable of shedding light on underlying and otherwise unapproachable past phenomena. This is indeed the basis of Microhistory or the conjectural paradigm in History. This article identifies key characteristics regarding this way of inductive or “bottom-up” inference and demonstrates its prospects when applied to prehistoric contexts. To illustrate this point, the article draws on a case study from the protohistory of Iberia: The treasure of Aliseda (seventh–sixth centuries BCE). This one-off assemblage – a true anomaly in its time, past, and present – was accidentally found in 1920 and has thenceforth been subject to assorted interpretations – mainly as individual burial goods from a feminine tomb – using deductive reasoning constrained by strong prejudices. A recent and comprehensive revision of this issue from an inductive and multi-stranded approach – mobilising several independent lines of evidence – has led to a fresh, sounder, and finer-grained micro-narrative. This case exemplifies a successful microhistorical enquiry, which has tracked retrospectively an array of inadvertent observations – from legacy dataset, new fieldwork, and science-based analyses – to illuminate the deviant circumstances framing this occurrence.

Failure on the frontier: a response to Price & Jaffe

Price and Jaffe (2023) argue that acknowledging failure humanises the past. It can also serve as a lens through which to reflect on archaeological reasoning. Here, we turn to the Roman world, and the frontier of northern Britain in particular, to consider how intentionality, distributed agency and moral judgement intersect with the recognition of failure in the past—and with the failures of archaeologists themselves.

Spatiotemporal reconstruction of ancient road networks through sequential cost-benefit analysis.

The construction of ancient road networks spanned generations and exhibits temporal path dependence that is not fully captured by established network formation models that are used to support archaeological reasoning. We introduce an evolutionary model that captures explicitly the sequential nature of road network formation: A central feature is that connections are added successively and according to an optimal cost-benefit trade-off with respect to existing connections. In this model, the network topology emerges rapidly from early decisions, a trait that makes it possible to identify plausible road construction orders in practice. Based on this observation we develop a method to compress the search space of path-dependent optimization problems. We use this method to show that the model's assumptions on ancient decision-making allow the reconstruction of partially known road networks from the Roman era in good detail and from sparse archaeological evidence. In particular, we identify missing links in the major road network of ancient Sardinia that are in good agreement with expert predictions.

Inference to the Best Explanation (IBE) and Archaeology: Old Tool, New Model

The last decades have seen a renewed interest in the study of argumentation in archaeology, particularly in response to the overproduction of weak and unreliable interpretations and explanations. Concurrently, recent appeals for scientific transparency and efficiency in the management of archaeological information in digital form have stressed the necessity of explicitly showing the processes followed. A growing body of literature has identified inference to the best explanation (IBE) as the most adequate way of interpreting archaeological data, although it has quietly existed for over a century. Despite this, the investigation of IBE-based models for recording archaeological reasoning remains a largely under-researched topic. The author concludes with a novel IBE-based model for recording archaeological argumentation.

Science versus Archaeology? The Case of the Bernstorf Fakes.

Although scientific methods are frequently applied in archaeology and are often considered as indispensable, their results do not always agree with archaeological expectations. This can usually be resolved by detailed discussions and by acknowledging the potentials and limitations of the different approaches. To do this it is necessary to accept the competence and experience of each other and, foremost, accept and understand the different methodologies. Here a case is presented, in which such a conundrum could in principle be solved but archaeological arguments are given a priori more weight and discomforting scientific results are thus suppressed. The case deals with a number of decorated gold foils and pieces of amber that were found near a Late Bronze Age structure at the hamlet of Bernstorf near the small town of Kranzberg, Lkr. Freising, in Bavaria. They were interpreted as clear evidence for contacts between Mycenae and Bavaria in the Late Bronze Age and it was suggested that the gold derives from Egypt. It was also maintained that this find would corroborate the widely accepted hypothesis of an “amber road” and a link between the Mediterranean cultures and Central Europe. Analyses of the Bernstorf gold showed it to be exceptionally pure which is not only unknown in natural gold but also in all prehistoric gold objects hitherto analyzed. It was therefore concluded that the finds from Bernstorf were made from modern gold foil, which is supported by radiocarbon dates of soil intentionally enveloping an amber “seal” containing gold foil of similar composition. However, this unavoidable conclusion is dismissed by some archaeologist, claiming that “mere chemical analysis” and “a chemist” cannot decide on the authenticity of an object and that archaeological reasoning has to be given priority.

The Vulnerability of Archaeological Logic in Aboriginal Rights and Title Cases in Canada: Theoretical and Empirical Implications

The history of archaeological evidence in Aboriginal rights and title cases in Canada illustrates an alignment between archaeological arguments regarding Indigenous history and recent court rulings. Although there are associations between cases that rule in favor of Indigenous rights and contemporary archaeological thinking and between rulings against Indigenous rights and older forms of archaeological reasoning, we argue that there is a more fundamental similarity. Both Canadian courts and archaeology seem to concur on assumptions of four core legal and historical principles: how were Indigenous societies organized, what was essential to Indigenous culture, what constitutes continuity, and what is the evidence for Indigenous rights. We argue that this convergence has less to do with evidence and instead derives from a shared cultural history, thus creating an ethnocentric bias. If archaeology is to assert its capacity to reveal history within rights and title cases, it must address three issues that emerge from this legal legacy: (1) lingering intellectual naïveté regarding interpretive links between material records and cultural identity, (2) associations between archaeological theoretical explanations for Indigenous history and western cultural practices, and (3) a fundamental ethnocentrism in archaeological understanding of humanity that reflects contemporary asymmetries of power. Contemporary archaeologists often valorize collaborative practices with Indigenous communities and subscribe to an ethic of equality and respect. However, its history in legal contexts in Canada suggests that archaeology is not able to achieve this ambition. This inability is particularly problematic given the increasing influence that archaeological experts appear to have in Canadian legal debates over Aboriginal rights and title.

Toy Story: Homophily, Transmission and the Use of Simple Simulation Models for Assessing Variability in the Archaeological Record

The interpretation of spatial and temporal patterns in the archaeological record remains a long-standing issue in the discipline. Amongst many methods and interpretations, modelling of ‘biased transmission’ has proved a successful strategy to tackle this problem. Here, we investigate a type of biased transmission, homophily, that is the tendency of individuals to associate and bond with similar others. In contrast to other social sciences, homophily remains underused in archaeology. In order to fill this gap, we develop six distinct variants of a well-established modelling framework borrowed from social science, Axelrod’s Cultural Dissemination Model. These so-called toy models are abstract models used for theory-building and aim at exploring the interplay between homophily and various factors (e.g. addition of spatial features such as mountains and coastlines, diffusion of innovations and population spread). The relevance and implications of each ‘toy model’ for archaeological reasoning are then discussed.

Review of Evidential Reasoning in Archaeology - Robert Chapman and Alison Wylie, Evidential Reasoning in Archaeology. London: Bloomsbury Academic (2016), 264 pp., $82.00 (cloth).

Review of <i>Evidential Reasoning in Archaeology</i> - Robert Chapman and Alison Wylie, <b><i>Evidential Reasoning in Archaeology</i></b>. London: Bloomsbury Academic (2016), 264 pp., $82.00 (cloth).

The Concept of Art as Archaeologically Applicable

In this article I review arguments in favour of the need and possibility of importing a revitalized concept of art in archaeological reasoning. By comprehending the concept of art as a function, rather than as a property inherent within particular kinds of objects or events, I offer a way of understanding art as the mode in which a phenomenon operates when its ontological multiplicity, its variety of equally real modes of being, becomes exposed. Seen in this vein, art emerges as an entity both created and experienced when several potential versions of a thing or event are laid bare. I emphasize that an element's capacity to communicate such factual intersectionality requires effort in order to endure; and argue that it is the formats for such ‘practices of maintenance’ that constitute art-worlds situated in culture. I also assert that these strategies, like all formalized engagements with material culture, generate traces, and accordingly can be grasped by analyses of an archaeological record. To illustrate this idea, I discuss the red ochre rock paintings from Neolithic northern Sweden made between approximately 6000 and 4000 bp by hunter-gatherer communities that were also producing petroglyphs.

Primordialism and the ‘Pleistocene San’ of southern Africa

Abstract

Experimental archaeology and the earliest seagoing: the limitations of inference

Experimental voyaging, of the type made famous by the Kon-Tiki and the Hōkūleʻa, is often considered to provide a means of modelling the performance of ancient seacraft, a relevant variable if we are to understand patterning in prehistoric island colonization and maritime interaction. Recently, in order to bolster claims otherwise dependent on contentious data, some proponents who argue for maritime colonisation as an evolutionarily ancient behaviour have suggested that such experiments provide corroborating evidence for deliberate seagoing by archaic hominins. Here, we examine the epistemological foundation for these claims, and in particular what constitutes the basis for building good analogues in archaeological reasoning and the limitations of inferences drawn from them. We stress the importance of not conflating possibilities with probabilities, and caution against an unwarranted uniformitarianism in making assumptions regarding the cognitive, social, behavioural and technological contexts of archaic and modern humans.

Uranium–thorium dating method and Palaeolithic rock art

Abstract Dramatic progress was seen in 14C-dating with the introduction of accelerator mass spectroscopy (AMS) which made possible the direct dating of prehistoric artworks painted or drawn with charcoal. However, in the case of engravings and red paintings, only indirect methods can be used that allow us to date deposits that have covered the works over time (TL, U/Th, oxalates, etc.). The uranium/thorium dating method gives reliable and relatively precise results in the case of massive speleothems, because the sampling is carried out at the heart of the material where the hypothesis of a closed system (that is, no exchange with the outside environment) is justified in most cases. Unfortunately, the situation is quite different in the case of thin layers of calcite that overlie Palaeolithic cave drawings. The conditions under which calcite forms depend largely on the hydrologic activity, which has greatly varied over the course of the Upper Palaeolithic and Holocene. In many cases, we can see that the growth of speleothems stopped during much of the Upper Palaeolithic. Consequently the ages obtained are minimum ages (terminus ante quem) which are frequently much younger than the real ages of the underlying artworks. Moreover, a much more serious but rarely considered source of error contradicts the assumption of a closed system. In thin layers of carbonate deposits and in damp media, the uranium incorporated into the calcite during its crystallization may be partially eliminated because of its solubility in water. Uranium leaching causes an artificial increase of the age that may reach considerable proportions (e.g. a negative hand in a cave in Borneo was dated to 27,000 years by U/Th whereas its 14C age was only 8–10,000 cal BP; Plagnes et al., 2003). Due to these two contradictory sources of error, the dates given by the U/Th method may prove to be younger or older, with deviations that are much larger than the standard deviations given by laboratories. As a result it is nearly impossible and very dangerous to base archaeological reasoning on U/Th ages of Palaeolithic artworks, so long as the dates are not confirmed by an independent method, dating the carbonates in the same samples by 14C being the best means of detecting anomalies. The application of the U/Th method for the dating of prehistoric rock art is still experimental. Technical improvements (for less damageable sampling) and fundamental research on the causes of errors are needed.

Jean-Claude Gardin on Archaeological Data, Representation and Knowledge: Implications for Digital Archaeology

This paper presents Jean-Claude Gardin’s distinctive approach to archaeological data, representation and knowledge in the context of his early engagement with semiotics and structural semantics and his grounding in fields as diverse as documentation, classification theory, material culture studies, argumentation theory and the philosophy of the human sciences. Pointing at Gardin’s ambivalence vis-a-vis the promises of automated classification and machine reasoning in archaeology, it shows that his approach goes beyond a normative, positivist conception of archaeological research, recognizing the contextual, theory-laden nature of archaeological data constitution, the priority of focusing on actual archaeological interpretation practices and the complementarity between narrative and formal representations of archaeological reasoning. It connects his early development of archaeological descriptive and typological metalanguages with his later elaboration of a theoretically informed approach to archaeological argumentation, analysis and publication, situates his logicist programme as a relevant contribution to the development of an archaeological “theory of practice”, grounded on reflexivity and modesty vis-a-vis the possibility of knowledge and the limits of scientism, and highlights aspects of Gardin’s work that point to potentially fruitful directions for contemporary research and practice in the field of archaeological informatics and digital humanities communication.

“Nubian” Archers in Avaris: A Study of Culture-Historical Reasoning in Archaeology of Egypt

The archaeology of Egypt is in world archaeological circles widely regarded as non-theoretical in a negative sense. The consequence of such a state of the discipline are often uncritical uses of concepts and models which were under heavy critique in archaeology since the 1960s. This paper examines the culture-historical reasoning in archaeology of Egypt by analysing the arguments provided for the presence of “Nubian” archers in Avaris (Tell el-Dabca). Their presence in Tell el-Dabca is often argued with the presence of Nubian pottery, arrowheads and skeletal remains. This paper analyses the way these finds of different date and contexts, are brought together in a coherent archaeological narrative. It is argued that the finds were identified as Nubian and mutually related because of the cultural-historical reasoning taken as an unquestionable interpretative model, a hidden theory.

Response: the discovery of New Zealand's oldest shipwreck

This is a response to the article entitled 'The discovery of New Zealand's oldest shipwreck-possible evidence of further Dutch exploration of the South Pacific' published in Volume 42 of the Journal of Archaeological Science (pp. 435–441). It raises several issues with the historical and archaeological research component of what is primarily a dendrochronological investigation and radiocarbon dating of timbers from New Zealand waters. It details why the article provides no evidence or sound archaeological reasoning to support either of its claims that the timbers represent a shipwreck and that they are evidence of early Dutch exploration of the South Pacific.

Uranium-series dating of carbonate formations overlying Paleolithic art : interest and limitations

Abstract : The Uranium-Thorium (U/ Th) series dating method, developed 50 years ago, has proven its usefulness and reliability for the dating of marine (corals) and continental (speleothems) secondary carbonates deposits. Recently, improvements of the analytical techniques (TIMS – Thermo-Ionization Mass Spectrometry, and then MC-ICPMS – Multicollector-Inductively Coupled Plasma Mass Spectroscopy and laser ablation) allow the dating of very small samples and increase the potential of this method. Given the difficulties of dating cave art (other than drawings created with charcoal, which can be directly dated by 14C), indirect dating methods have been sought. During the last decade, several publications have reported the dating by the U/ Th method of thin layers of calcite overlying Paleolithic paintings and engravings or the support of these representations. In these cases, the age of calcite formation is assumed to provide a minimum age (terminus ante quem) for the underlying paintings or engravings or a maximum age (terminus post quem) when it is the support that is dated. The current article describes the relevance and potential of this method when applied to the dating of calcitic layers deposited above or below prehistoric drawings, together with the specific difficulties encountered in U/ Th dating of such thin deposits. An initial difficulty is that thorium may be present in the calcite from the beginning (detritic thorium), making age corrections necessary. Another difficulty is that in the humid conditions prevalent in caves, the walls may have been subject to runoff over time. In this case, thin calcite layers covering paintings or engravings may have been altered, with possible chemical exchange between the water and the calcite. The most probable effect of this ‘open system’ behavior is the leaching of uranium, leading to an overestimation of the age of the calcite. Recent applications of the U/ Th method to the dating of rock art have shown that this phenomenon, if not correctly identified by means of independent methods, may become a significant source of error. For this reason, it is important to know the concentrations of uranium in each calcitic sample, as this makes it possible to detect local anomalies that have led to a substantial loss of this element. In a recent paper concerning the U/ Th dating of eleven Paleolithic decorated caves in the Cantabrian Region (Spain), extremely early dates were determined (more than 41,000 years in one case) and the authors speculated that certain representations could have been produced by Neanderthals. However as detailed analytical data (uranium content) have not been published one cannot appreciate the reliability of the ages obtained. Then, in the absence of confirmation by an independent dating method, it is premature to base an archaeological reasoning on these dates. This article emphasizes the necessity of carrying out several analyses on the same sample, and when possible on several layers from its thickness. Moreover it is important to perform cross dating using U/ Th and 14C (or even using other elements such as 226Ra or 231Pa) in order to verify the consistency of the results. Several recent examples will illustrate this necessity. It should be also recalled that the calibration curves used to correct radiocarbon ages are largely based on the simultaneous dating by U/ Th and 14C of the same samples of speleothems and corals. Finally, it has to be mentioned that when the deposits underlying paintings or engravings are studied, the data obtained could be distant in time from the creative act. In fact, the growth of calcite is controlled by environmental factors and is favored during temperate and humid periods. Thus, a large number of calcitic layers overlying paintings could have been deposited during the Holocene. They could also have grown during a brief warming of the last glacial period, or represent a mean age between several growing periods. Nevertheless, these chronological data could bring relevant information, once their validity has been verified.

East Baltic Middle Iron Age Wealth Deposits in Burial Areas: An Example of Regional Cultural Practice

This article provides an example of how variable the uses of and practices in prehistoric burial monuments can be. The concept of ‘wealth deposits’ is introduced, which arguably helps to define the variety of intentionally concealed artefact deposits as a whole. An emphasis is put on deposits in burial areas. It is shown that the depositional practices in burial areas vary considerably in the three Baltic countries, and we can definitely talk about small-scale regional practices, not universal and unitarily interpreted cultural phenomena. Special attention is paid to Estonian Middle Iron Age material. An overview of possible interpretations based on purely archaeological reasoning, as well as parallels from written sources, is provided. DOI: http://dx.doi.org/ 10.15181/ab.v19i0.275 Key words: Middle Iron Age (fifth to ninth century AD), Baltic countries, wealth deposits, hoards, ritual, religion, written sources, burial monuments.

Anthropic activity markers and spatial variability: an ethnoarchaeological experiment in a domestic unit of Northern Gujarat (India)

Spatio-temporal understanding of past domestic activities is a key aspect of archaeological reasoning. The identification of markers of particular anthropic actions through time has become a fundamental issue. Chemical analyses of archaeological floors are an essential tool to investigate and identify anthropic markers of past human activities. This paper explores the relative spatial variability of chemical residues of floors in an ethnographic context to provide a constructive basis to experiment with spatial analysis for the detection and interpretation of anthropic activity markers. These markers are recognised as anomalies and tendencies in the relative spatial distribution of chemical residues embedded in the floor. The experiment has been carried out in a controlled environment and serves to test the methods and assumptions to be used in archaeological contexts. Spatial interpolations (IDW, Map Algebra and PCA) were performed and allowed the identification of anomalies in the distribution of residues that can be associated with specific activities (fuel use, food preparation and consumption, use of fireplaces). Geostatistics (Ordinary and Regression Kriging) was used in order to contribute to the identification of trends related to the use of space and the connected activities (e.g. inner versus outer space, storage versus cooking). The results show how the integration of different techniques can improve data interpretation.

The Play of Tropes in Archaeology

The language of archeology is infused with figurative speech or tropes such as metaphor and metonymy. Since tropes mark symbolic representations in archaeological language and reasoning, it is critical to develop a strongly reflexive posture regarding how archaeologists make interpretations, name artifacts, and carry out bridging arguments through ethnoarchaeology. The misuse of analogy rhetoric in ethnoarchaeology is particularly problematic, for it obscures how analogy is displaced by metonymy to create transformed identities between the past and present. The action of metonymy within ethnoarchaeology further obscures, through amplified metaphorical tension, critical differences that may feed further archaeological inquiry. The solution to this conundrum is a strictly comparative approach that abandons the analogy framework and that seeks to explain how and why differences arise.