Tephra, tephrochronology and archaeology – a (re-)view from Northern Europe
© Riede and Thastrup; licensee Chemistry Central Ltd. 2013
Received: 22 March 2013
Accepted: 10 May 2013
Published: 28 May 2013
Volcanic eruptions are often, although by no means always, associated with a profuse output of fine pyroclastic material, tephra. While residence time in the atmosphere of the very finest of these particles can be substantial, the deposition of the bulk of volcanic ejecta can be considered instantaneous from a geological, archaeological, and evolutionary perspective. Often these volcanic products can be identified by various chemical and non-chemical means and if the eruption date is known, the occurrence of tephra from a given eruption in stratigraphic sequences provides a powerful means of dating such deposits, or of refining available dating schemes. Furthermore, the occurrence of tephra from the same eruption across sites, regions and in various types of depositional contexts (ice-cores, terrestrial, marine, cultural) holds the potential of linking and thus elucidating the tempi and causes of both environmental and cultural change. Recent years have seen considerable advances in tephrochronology studies, especially regarding the detection of macroscopically invisible micro- or cryptotephras. In parallel with the possibility of detecting hitherto invisible tephras over vastly increased areas, the overall potential of tephrochronology as a major dating tool for both palaeoenvironmental scientists and archaeologists is greatly expanded. The aim of this paper is not to be comprehensive, but to provide a brief and timely general review of tephra studies and their methodologies, and to make a case for better linking tephra research to archaeology, all from a primarily Scandinavian perspective. We argue that the identification of tephra in archaeological sediments should, in due time, become as routine as other types of geo-archaeological analyses, especially given that tephra cannot only act as a useful chronostratigraphic marker, but can also play a role in changing patterns of environmental and cultural change at the level of the site or the region. In order to move towards such integration, a series of methodological challenges have to be met. We outline some of these, and provide pointers as to how and where tephrochronologists and archaeologists can work together more closely.
KeywordsTephrochronology Geochemical fingerprinting Tephra Archaeology Chronology Electron microprobe LA-ICPMS
Tephra is usually further divided by size classes into ash (<2 mm), lapilli (2–64 mm), and bombs or blocks (>64 mm), the latter of which can reach considerable sizes. The focus of this review is on material at the lower end of this size spectrum and its use as an analytical tool in archaeologically relevant contexts as, first and foremost, chronostratigraphic markers and, secondarily, as possible causal elements in culture-historical change. While the very finest volcanic particles ejected as part of volcanic eruptions can have considerable residence times in the atmosphere as aerosols, the larger particles such as rock fragments, pumice, crystals, and glass tend to fall out already during or shortly after the eruption. They effectively form isochrons. Especially explosive eruptions are associated with a profuse output of such material, and the frequency of such eruptions throughout the Quaternary is substantial [4–6]. Nonetheless, tephrochronological research remains a young field of specialised study. Pioneering near-field work was carried out on Iceland in the first half of the 20th century by Thorarinsson , but it was as late as 1981 that the prospect of a superregional, far-field tephrochronology was first aired . Scientists in the UK swiftly followed Thorarinsson’s lead [9, 10], and thanks to the many Icelandic eruptions through the millennia [11, 12] and a vibrant and growing research community (see http://www.swansea.ac.uk/geography/research/environmentaldynamicsgroup/tephrainquaternaryscience/) there now exists a robust tephrochronological lattice for the Late Pleistocene and Holocene of the north-western Atlantic seaboard [e.g. [13–17] and references therein]. In central Europe, the botanist Firbas  suggested already in 1949 that tephra from the Late Glacial Laacher See-eruption could be used as a chronostratigraphic marker for the Allerød chronozone in Europe north of the Alps. This enthusiasm was mirrored by the archaeologist Schwabedissen’s  remark on how this tephra layer likewise could be used in archaeological investigations both in the near- as well as the far-field of the eruptive centre. Yet, it was first in the 1980s that more extensive distribution maps for the Laacher See tephra were presented , and more recent still that such data are updated and made available interactively .
The basics of tephrochronology
Tephrochronology is the “use of tephra layers as isochrons (time-parallel marker beds) to connect and synchronize sequences and to transfer relative or numerical ages to them using stratigraphy and other tools” (: 111). This section briefly describes the standard analytical protocols for tephrochronological analysis from field to laboratory. It is worth highlighting that at least the initial stages of sampling and sub-sampling are easily integrated with other types of fieldwork, e.g. sampling for pollen, diatoms or the like, or during standard archaeological excavation where samples can conveniently be taken in open profiles. As in any kind of environmental or archaeological fieldwork, profiles or cores should be described in the field, and any samples duly labelled. Sampling from open profiles is preferable, as sampling with a corer may twist, compact, or otherwise compromise the intactness of the targeted layers. In addition, the general layer structure and possible taphonomic disturbances can be better assessed already in the field when profiles of some length are exposed.
Once the core or block sample is taken, a variety of techniques for an initial identification of the presence/absence of tephra particles is available: magnetic susceptibility, remanent magnetization, X-radiography, scanning X-ray analytical microscopy, spectrophotometry, high-resolution micropetrography, high-resolution trace element analysis via instrumental neutron activation analysis (INAA), as well as less advanced measurements such as particle size distribution, total organic carbon, and loss-on-ignition (see references [28, 30] for details). A particularly useful initial range-finding technique is core scanning by X-ray fluorescence (XRF). This fast method has been reported to work well for detecting considerable (>1000 shards/cm3) spikes of especially basaltic tephras, but smaller tephra peaks of rhyolitic composition are less well detected . XRF core scanning should thus be used in conjunction with the manual range-finding approach described below, and arguably has its greatest strength in allowing the identification of broad areas with high and mixed shards concentrations, i.e. as an exclusion tool.
Extraction protocols best suited for separating tephra particles form their surrounding matrix depend on the nature of said matrix. When dealing with ombrogenous matrices such as peats ashing alone or in combination with acid digestion usually suffices . Current best practice for extraction of tephra from mineral-rich sediments is the physical density-separation method described by Turney  and further refined with important down-stream improvements by Blockely et al. . This method is based on the initial concentration of shards in each sample via ashing and sieving, followed by flotation of particles in a heavy liquid, usually sodium polytungstate (SPT) at 2.5g cm-3. It is important to note that if tephra samples are prepared for geochemical analysis they should be neither ashed nor should they come into lengthy contact with corrosive chemicals, which has been shown to significantly but unsystematically alter the chemical composition of the glass shards. Such corrosion makes the correct geochemical identification and correlation of the extracted tephra difficult if not impossible and a modified extraction procedure needs to be followed . The useful protocol summaries of Swindles et al. , Turney , and Blockley and colleagues  lay out the guidelines for these complementary methods.
As the search for tephra via physical separation can be time-consuming, initial subsampling bins should be chosen at range-finding intervals contingent on overall sequence length. For shorter, usually terrestrial stratigraphies, range-finding bins of 5 or 10cm are appropriate. Once tephra has been located in these bins, tighter sampling can commence at 1cm intervals. Even greater precision can be achieved if, for instance, varved lake sequences are investigated, where in principle seasonally differentiated tephra deposition can be elucidated .
A more detailed counting of shards, reported as shards/g or shards/cm3 sediment, follows the initial establishment of tephra presence. It is worth noting that true isochrones can reach shard concentrations of several thousands per g and still remain invisible to the naked eye. Once tephra peaks are securely identified and counted – often against a scatter canvas of occasionally rather substantial background occurrences – shard extraction can proceed. Shards are mounted in Canada balsam, Glycerol or Euparal™ depending on the amount of residual biogenic silica after extraction. Again, Blockley and colleagues conveniently describe this protocol, now widely used by researchers in Europe and elsewhere, in greater detail . Already at the stage of identifying and counting, shard morphology as seen under an optical or scanning electron microscope (SEM) can be used in conjunction with the stratigraphic position of the sample to make tentative suggestions about the particle source. However, many eruptions produce similar-looking shards or are multi-phased thus producing a variety of shard types. Tephra isochrons containing many shards can also contain material from several eruptions closely spaced in age. Visual inspection alone is therefore never enough for a secure identification.
In order to correlate a given tephra deposit securely to others, and ideally to a known source, geochemical fingerprinting is used. The most common analytical procedure is to quantify the major elemental composition of the sample via an electron microprobe (EMP). Prior to the widespread availability of this technique, simpler and cruder methods such as heavy minerals counting and shard refractive index were used to identify particular eruptions. These techniques are still commonly encountered in studies whose primary focus is not tephrochronology, but where such an identification still serves the purpose of anchoring a given sequence in time (e.g. pedological and palynological investigations, e.g. [63–66]). When even the resolution of the EMP does not suffice to distinguish between the different eruptions of the same volcanic zone – as for instance the many Pleistocene and Holocene Icelandic eruptions  – laser ablation-inductively coupled plasma mass spectrometry (LA-ICPMS) is now being taken into use to investigate rare-earth element and trace elemental compositions [67, 68].
Tephrochronology and archaeology
Archaeologists have long been aware of the potential utility of tephra isochrons as dating tools. In addition, volcanic eruptions are regularly considered as prime movers or contributing agents in cultural changes documented in the archaeological record (see, for instance, [45, 69–72]). Yet, systematically looking for tephra – especially for cryptotephra – in archaeological stratigraphies is not or at least not yet part of the standard toolkit of archaeologists. The following section uses a series of case studies to highlight the problems with and potential benefits of such integration, and to emphasise some of the challenges when looking for and dealing with tephra deposits embedded in humanly modified or generated strata. Rather than comprehensively reflecting current work in tephrochronology, the case studies discussed here are intended to illustrate the potentials and pitfalls of tephra studies specifically in relation to or performed at archaeological sites. As Housley et al. note “the ability of cryptotephra to survive in archaeological contexts is not well documented” (: 708–9), and each case study discussed here offers particular lessons and insights with regard to the preservation and detection of tephra layers and of, in particular, cryptotephra layers in archaeological sites.
The Dosenmoor raised bog is located in Schleswig-Holstein (northern Germany) at 54.131667/10.019444. It is well-studied from a palaeoenvironmental perspective (see, for instance, reference ). Important from the perspective of this review is the fact that the site has been the repeated subject of independent archaeological , palynological , as well as tephrochronological [76, 77] investigations at different points in time. Beginning with the most recent study, van den Bogaard and Schmincke were, in 2002, able to successfully identify 13 discrete tephra layers in a core sequence c. 7.5m long. Two parallel cores were investigated at this point, one from the centre and one from the margin of the bog, and, importantly, there was no complete correspondence between the two sequences. While this difference has never been systematically investigated it suggests that different deposition processes or perhaps the deposition of airfall tephra at different times of the year has some influence on where within a single basin the material finally is emplaced, a pattern since also observed elsewhere in northern Europe . Nonetheless, many of these tephras could be identified, and they have provided important links between palaeoenvironmental records across the North Atlantic, as well as acting as high-precision chronological markers for the Dosenmoor sequence itself.
We include the Dosenmoor case study here not so much as an example of where tephrochronology has been applied in relation to archaeological investigations, but rather where it has not been applied. The history of the Dosenmoor case study serves to stress two points. First, the dramatic methodological developments in tephrochronology over, in particular, the last ten years make the investigation of new sites but also the re-investigation of old cores a worthwhile endeavour. It is also worth noting that neither core scanning XRF nor density separation methods for detecting and extracting tephra were apparently used in any of these studies at Dosenmoor. The major methodological advances in tephrochronology outlined in the previous section were implemented only after these studies were completed. One can thus only speculate on how many additional tephra layers one may be able to identify if this sequence was to be the subject of renewed analysis. Second, tephras are of interest to many stakeholders, and costly fieldwork should integrate as many of these interests as possible. We cannot know whether the pollen core investigated during the 1970 contained any tephra at all, but if bog centre and margin can be linked to human occupation areas through step-wise sampling, tephrochronology can be made more directly relevant also to archaeological investigations – the latter are in as much pressing need for age control and cross-regional correlation as the environmental sciences.
Ahrenshöft LA 58D, Germany
Much like the Dosenmoor, the site of Ahrenshöft (Schleswig-Holstein, northern Germany, 54.565833/9.108056) has a lengthy history of investigation. There are numerous clusters of Late Glacial archaeological material in the area [80, 81], effectively hugging the shores of a palaeolake. Excavation at one of these clusters (LA 73) has provided, for the first time, stratigraphically separated occupation evidence from the early, so-called ‘classic’ and the later, so-called ‘Havelte’ phases of the Hamburgian culture . This culture is associated with the human pioneer re-colonisation of northern Europe after the last ice age. It is most famously known from the excavations of Alfred Rust in the Ahrensburg Tunnelvalley in the first half of the 20th century, where abundant organic remains were recovered alongside lithic material [83, 84]. The Hamburgian culture is, however, also known from Holland , Poland [86, 87], Denmark [88, 89], and perhaps even as far afield as Scotland . Whilst a fairly substantial suite of radiocarbon dates is available for this techno-complex [91, 92], the individual dates are of highly variable quality and context, and the majority of sites lack absolute dates due to overwhelmingly poor organic preservation at most sites. Accurately dating sites and correlating between them is thus an important research priority. With this in mind, an attempt was made to include tephrochronological investigations as part of recent renewed excavation at the locale of Ahrenshöft LA 58D [93, 94].
Both major and trace elemental analyses were performed on the Ahrenshöft samples, but neither succeeded in discriminating which eruption or eruptions are in evidence at the site. It is clear from these data that the material derives from the Icelandic Katla system, but there are multiple candidate tephras: the Vedde Ash (rhyolitic fraction; mid-Younger Dryas/GI-1), tephra AF555 (late Younger Dryas/GI-1), and the Suduroy tephra dated to the early Holocene. Whilst the tephrochronological analysis at Ahrenshöft LA 58D by no means succeeded in providing a directly useful isochron for the considerably more ancient human occupation at the site, it did demonstrate that even open-air sites with shallow stratigraphies can yield fairly intact tephra deposits. The clearly complex pattern of ash deposition at the site offers important lessons about the impact of small-scale taphonomic processes and topographic differences on tephra preservation. At Ahrenshöft, areas of lower artefact concentration correlate with areas of better peat preservation as well as with better tephra preservation and vice versa. This implies that humans can be important agents in redistributing and reworking tephra deposits. Tight multiple sampling and intra-site crosschecking is thus recommended when looking for tephras in archaeological sites.
Laacher See tephra – near- and far-field
Around 13.000 years ago, the Laacher See-volcano (50.416667/7.266667), located in present-day western Germany between the cities of Bonn and Koblenz, erupted cataclysmically [95, 96]. As this was the last major eruption from this volcanic zone, the Laacher See-eruption (LSE) remains relatively unknown amongst both archaeologists and the public despite it being classified as a ‘super-eruption’  and despite it being very well-studied from a volcanological perspective (see, for example, [98–109]). Scoring a Magnitude, M= 6.2 and an Intensity, I≥ 11.5 (see  for how to calculate these) it devastated a near-field area of >1400km2, and severely impacted the drainage of the River Rhine by fist blocking it and later sending one or several large tsunami-like waves downstream [111, 112]; river-rafted LSE materials are now known even from the English Channel . Yet, much like at Pompeii, the eruption’s thick blanket of pyroclastic material covered and thereby preserved a Late Glacial landscape replete with burned woodlands [114, 115], traces of animal movement  as well as archaeological sites ranging from miniscule artefact clusters around single short-term campfires  to some of the richest locales known from this time .
The number of Laacher See tephra (LST) occurrences in Europe
Tjørnuvík, Faroe islands
Tjørnuvík is located on the island of Streymoy, Faroe Islands at 62.289503/-7.148280. The timing of the first human settlements in Faroe Islands has been subject to a fair amount of discussion . The majority of AMS dates indicate that the initial settlement of the Faroe Islands took place between AD 600–900, but as this time interval coincides with a plateau in the calibration curve dating by radiocarbon alone provides only limited resolution. Small islands such as the Faroes are ideal testing grounds – natural experiments of history – for both colonization scenarios and for investigating the impact of humans on previously unmodified landscapes [147–149]. In an exemplary investigation, Hannon and colleagues set out to date the first settlement by combining different proxy analyses: pollen, trace charcoal, macrofossils, diatoms, AMS radiocarbon dating and tephrochronology [146, 150, 151]. Pollen analysis from a valley marsh at Tjørnuvík indicates settlement in the area at AD 650–900, and three tephra horizons were discovered in the investigated stratigraphies. Tjørnuvík A, Tjørnuvík B and the basaltic phase of the landnám tephra (VIIa). The origin and date of Tjørnuvík A derives from an otherwise unrecorded Hekla eruption in the 9th century AD. Tjørnuvík B shows similarities to the 1158 AD eruption of Helka, but radiocarbon dates and stratigraphic position show that this tephra is, in fact, older . The landnám tephra, dated to AD 871±2 , is found above the first settlement indicators clearly demonstrating that human impact on the vegetation predates this event.
The Tjørnuvík case study underlines that environmental proxy analyses, AMS radiocarbon dating, and tephrochronology in judicious combination can significantly strengthen historical ecological conclusions, especially in key periods – such as the Norse expansion in the North Atlantic – where plateaus in the calibration curve occur. Yet, one can also note that tephra analysis has not (or not successfully) been applied in similar studies on the Faroes (e.g. ), nor are we aware of attempts at extracting tephra from actual archaeological sites on any of the Faroese islands. In our opinion, the full potential of tephrochronology in the Faroe Islands, as elsewhere, will first be realized once we can use tephra to directly cross-link environmental and archaeological sequences.
This final case study does provide an example of how such linkage may be achieved. Balascio and colleagues’ combined archaeological and tephrochronological study of the important Iron Age/Viking site of Borg on the Lofoten Islands, Norway (68.25000/13.785833) at present stands as one of the best examples of such interdisciplinary research . The site is characterised by a suite of boat-houses, so-called nausts, belonging to an emerging political stronghold in the area connected to fishing and trade. Indeed, such boat-houses are a key feature of the built environment of Iron Age, Viking and Medieval periods in the North Atlantic, and their somewhat mundane label belies their actual multi-functionality and their importance as locational foci for both economic, military, and political operations in these periods [155–158].
Yet, despite their culture-historical significance, relatively few of these structures are dated absolutely, and a chronological division of the material based on architectural features and size alone only holds limited promise . Balascio and colleagues succeeded in extracting (using the acid digestion protocol) and subsequently geochemically fingerprinting tephra from two strata. This allowed them to constrain the periods of use of the boat-houses at Borg through the use of tephrochronology. Much like at Tjørnuvík, such bracketing again proved particularly useful here given the plateau in the calibration curve around this time, and the generally increased need for chronological precision at this near end of the radiocarbon dating range. Multiple tephra occurrences – here from the well known AD 860 Layer B tephra and later AD 1104, 1158, or 1300 candidate Hekla tephras – provided secure temporal anchors in these stratigraphies.
Should one be surprised that tephra was found at this site? The Lofoten have yielded the most complete tephrochronological record in Norway spanning the entire Holocene and part of the Late Glacial . It is interesting to note in this respect that the collaborative effort of Balascio et al. came about more by coincidence than by design (S. Wickler, pers. comm. 23.2.2012): Research into the environmental history of the inner lake Borg (see ) was being conducted at the same time as archaeological research at its shores. From there it was only a short step to also apply the tools of tephrochronology – at any rate already part of the former project’s methodological repertoire – also to the samples from the archaeological site. Whether by coincidence or design, Balascio and colleagues did, encouragingly, succeed in clearly demonstrating “the potential for crypto-tephrochronology as a geochronologic tool for archaeologists in Norway” (: 940). The true potential of this new tool will, however, first be realised if and when it has come into use more widely, both in terms of systematically investigated sites and contexts as well as in terms of countries in which it is applied. In addition, lessons from the Ahrenshöft investigation discussed above further suggest that there is also some danger in spot-sampling for tephra at archaeological sites: We do not know, therefore, whether the tephras are preserved in layers or lenses at Borg.
Lessons learned and future challenges
Tephrochronology and, in particular, its cryptotephra extension are still young fields of specialisation. The chance of successful detection of cryptotephras relies above all on stable depositional conditions as found in, for instance, small-to-medium-sized lake basins that preferably lack complex and shifting in- and outflow channels . Most archaeological sites are far from this in terms of depositional context, making the search for preserved tephra layers in such stratigraphies a risky venture. Yet, relatively few types of sites have been sampled, and the number of samples per site has generally been low. Detailed taphonomic observations coupled with closely spaced sampling, however, have demonstrated that there can be substantial variation in the preservation of tephras across short distances – both in environmental  as well as in archaeological contexts . One of the lessons that can be learned from the case studies presented here is that multiple samples should always be obtained in as systematic a fashion as is possible. Samples from archaeological sites should, if at all possible, be multiple in order to assess layer intactness, and complemented by samples from nearby environmental contexts. It is our recommendation that such parallel sampling should follow a transect strategy from archaeological site (on-site/multiple features or sections) > archaeological site (off-site) > nearest lake/bog (margin) > nearest lake/bog (centre). Whilst costly such a strategy would maximise the chances of finding tephra, would allow environmental reference samples to be obtained, and would make it possible to arrive at both a site-specific as well as, eventually, a more general understanding of how and why tephra preserves in some places but not in others.
Once found, the analysis of tephras from archaeological sites should be handled following the established laboratory and analytical protocols. The interpretation of tephra distributions in and around a given site should be conducted as a collaborative effort between environmental and archaeological specialists. Natural processes alone can move tephra around in profiles, and even create false secondary layers either above or below the actual air-fall event strata [31, 78, 161]. Adding humans to the list of taphonomic agents will not make the interpretation of such layers easier, but it is worth stressing that tephra may, due to it being inorganic, provide a particularly useful (at times perhaps sole) dating tool in archaeological sequences with poor organic preservation.
Where community reference databases are already in place, all resulting data should be submitted to these. We see data sharing as a critical tool for furthering research, especially this kind of work that does not respect current national boundaries. Indeed, one priority for future work aimed at elucidating the relationship between volcanic events and the human past is the establishment of complementary databases on the societal and economic characteristics of the affected groups. Both disaster scientists and volcanologists have assembled sizable databases of volcanic eruptions as well as their impacts in recent times [4, 5, 162, 163]. No such databases exist for deeper historical let alone prehistoric times. If, however, the aim is to not only examine volcanic eruptions and their attendant tephra distributions as purely chronological tools, but also to consider the impacts of such events on the affected societies themselves, these databases must be structured around the societies themselves, not the eruption events. This is so, because (a) the effects of eruptions differ markedly in the near- and far-field , and (b) because the vulnerability that transforms an initially neutral geological event into a catastrophe is a complex, multivariate measure that is grounded at least as much in the social and historical parameters of the affected communities as in the geophysical parameters of a given event [165–167]. The finding and secure geochemical identification of a given tephra layer is a critical but merely an initial step.
Precise and accurate chronologies are paramount for studies of past environmental and cultural change. Tephrochronology constitutes a powerful dating tool and “tephra studies have become increasingly important in Quaternary research as the need to provide high-resolution palaeoenvironmental or archaeological records, and to synchronize and date such records, has become an urgent focus” (: 107–8). To date, the vast majority of (crypto-)tephrochronological research has been and still is conducted as part of environmental science, and it is made relevant to archaeology via very effectively providing better-resolved environmental backdrops to cultural changes (e.g. ). Yet, to fully unlock the potential of tephrochronology to directly link environmental and cultural sequences, future work should, in our opinion, attempt to more systematically and routinely look for tephra also within archaeological stratigraphies. Whilst recent tephra research projects such as the UK-based, NERC-funded RESET initiative, or the LaPaDiS project funded by the Danish Council for Independent Research | Humanities do contain archaeological work packages, they are, somewhat paradoxically, aimed at linking ancient deep time archaeological records to dated volcanic eruptions via tephra analyses. Tephras of such age are difficult to find even under the best of circumstances. Adding to this, humans are by all accounts effective taphonomic agents, and finding intact tephra layers in occupation sites is a long, albeit not impossible shot [33, 125]. Projects centred on deep prehistory tend to naturally include strong environmental and/or geological elements, so adding tephrochronology to the methodological repertoire makes good sense. Projects concerned with more recent periods should, we recommend, follow this lead.
They would allow many more sites to be dated both accurately and precisely.
They would allow both accurate and precise terminus ante/post quem correlations of local culture-historical sequences over potentially vast expanses of space.
They would facilitate detailed investigations into the potential culture-historical impact of the eruptions themselves or other “collateral” (: 59) environmental changes around them.
In turn, they would also feed back into volcanological research by adding to the total record of known eruptions and their attendant tephra distributions.
Tephra is well known to travel great distances – even across continents  – and could thus serve to link not only volcanic zones but also to bind cultural provinces (e.g. the Viking/Norse heartland in Scandinavia, Iceland, Greenland, Faroe Islands and the Atlantic seaboard of the USA; Late Glacial Europe, etc.) together internally, and with each other. The identification of such potential marker horizons in both archaeological and palaeoenvironmental sequences then offers the exciting opportunity for high-resolution comparative studies of the relationship between human societies and environmental changes that avoids the methodological uncertainties otherwise associated with such studies .
Whilst rare on a human time-scale, volcanic eruptions are common occurrences over geological, evolutionary, and archaeological time. The human lineage has a strong association with volcanic landscapes , and tephrochronology already is a powerful tool in dating the very earliest of archaeological and palaeoanthropological remains . The possibility that larger eruptions may have significantly affected the course of human evolution globally [184–189] and regionally [33, 190, 191] alone warrants a tight integration of tephrochronology and archaeology. Yet, this review has underlined that the archaeological utility of tephra markers goes well beyond their presence in the geological matrices containing cultural material and well beyond early prehistory into historic times – especially when extended to also cover cryptotephras. In doing so, this review has attempted to summarise and evaluate some of the recent research at the interface between archaeology and tephrochronology. At the same time this paper also flags up the need for a tighter and more systematic integration of these fields of study. Despite the remaining methodological challenges and problems outlined by Lowe  the protocols of tephrochronology are now so well-established and mature that the time is right to experiment with sampling from a wider range of not only natural but also cultural deposits (and, importantly, to also report when and ideally why sampling returned negative results). Any structure that captures and preserves airborne material in some form of stratigraphic order – wells, ditches, multi-phase burial mounds, shell-middens, house floor successions, etc. – potentially preserves traces of volcanic ash. Archaeology can play an important role in exploring the range of responses of human societies to climate change in the past, but securely linking environmental to cultural archives is of fundamental importance in order to differentiate between just-so-stories of environmental impacts and the actual, but usually complex causal chains of culture change in the wake of climatic and environmental disturbances [71, 192–194].
Laser ablation-inductively coupled plasma mass spectrometry
Instrumental neutron activation analysis
Scanning electron microscope
Natural Environment Research Council
Response of humans to abrupt environmental transitions
Saturation isothermal remanent magnetization
Laboratory for Past Disaster Science.
FR and MBT are funded through the Danish Agency for Science, Innovation and Technology’s Independent Research Council | Humanities grant 11–106336. This paper arose from a joint presentation at the SMIA X Scientific Methods in Archaeology meeting, Aalborg University, Esbjerg (Denmark), September 27th-29th, 2012. We gratefully acknowledge the suggestions of two anonymous reviewers who provided important and constructive comments. All omissions and errors remain ours.
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