Geoarchaeological tsunami deposits at Palaikastro (Crete) and the Late Minoan IA eruption of Santorini

The explosive eruption at Santorini in the Aegean Sea during the second millennium BCE was the largest Holocene volcanic upheaval in the Eastern Mediterranean region. The eruption was disastrous for the Minoan settlements at Santorini, but the effect on human society in the neighbouring islands and regions is still clouded in uncertainty. Tsunami generation was suggested, but comparatively little evidence was found. The lack of firm tsunami traces is particularly puzzling in Crete with its coastal settlements of the Late Minoan IA period, during which the Santorini eruption occurred. Here, we report the discovery of extensive geoarchaeological tsunami deposits at Palaikastro in north-eastern Crete. These deposits are characterized by a mixture of geological materials, including volcanic Santorini ash, and archaeological settlement debris. Various tsunami signatures were identified: (1) erosional contact with the underlying strata, (2) volcanic ash intraclasts in the lower part of the deposit, (3) reworked building stone material in the lower part of the deposit, (4) individual marine shells, (5) marine micro-fauna, (6) imbrication of rounded beach pebbles, settlement debris, ceramic sherds and even bones, (7) multi-modal chaotic composition. Late Minoan human settlement activities at Palaikastro provided architectural and stratigraphic frameworks in space and time that recorded and preserved tsunami evidence as geoarchaeological deposits. Such stratigraphic resolution and preservation may not occur in the natural landscape. Volcanic ash transported by wind from Santorini south-east to Crete preceded the tsunami. Geological, archaeological and radiocarbon dating criteria all converge, indicating that the tsunami deposits are coeval with the Minoan Santorini eruption. Field evidence suggests that tsunami waves at Palaikastro were at least 9 m high. Inverse tsunami modeling was attempted, based on these newly discovered tsunamigenic deposits. The initial wave in the generation region at Santorini that best fits the stratigraphic data is a wave with +35 to −15 m initial amplitude and a crest length of about 15 km.     

Contouring the Cataclysm: A Geographical Analysis of the Effects of the Minoan Eruption of the Santorini Volcano

This study is a step forward in understanding the palaeoenvironmental effects of the Minoan eruption of Santorini (1627–1600 BCE). We employ geostatistics to produce a prediction map for the thickness of the tephra fallout over the Eastern Mediterranean, and we reconstruct the effects by comparisons with recent eruption analogues. Based on the geostatistical map, the amount of environmental disruption over so far undocumented areas is estimated by comparison with archaeological sites where emplaced Minoan tephra has been recorded before. Nevertheless, independent field evidence suggest that the environment responded differently in places, occasionally posing challenges to the presented interpolation. A second line of evidence coming from contemporaneous fluvial archives provides clues for a widespread ‘Minoan flood’ over a large part of the Eastern Mediterranean, associated with the eruption itself. This simultaneous hydrological event may have had a counterbalancing effect on the impacts of the Minoan tephra cover, and could explain the sporadic discrepancies between the predicted effects and the palaeoenvironmental evidence. Traces of the effects of this extraordinary volcanic event are also sought in the regional Late Bronze Age literature.     

RADIOCARBON DATING ARCHAEOLOGICAL SAMPLES IN THE EASTERN MEDITERRANEAN, 1730 TO 1480 BC: FURTHER EXPLORING THE ATMOSPHERIC RADIOCARBON CALIBRATION RECORD AND THE ARCHAEOLOGICAL IMPLICATIONS*

The East Mediterranean Radiocarbon (Inter‐)Comparison Project (EMRCP) has measured time series of radiocarbon ages for known age samples of German oak (GeO) and for samples from the near‐absolutely placed Gordion juniper dendrochronology from central Anatolia. In this paper, we review the data for the calendar years from 1730 to 1480 bc , relevant in particular to controversy and debate concerning the absolute date of the Minoan eruption of the Santorini (Thera) volcano. We consider the issue of the radiocarbon (¹⁴C) dating of the Santorini eruption, and the problem of how this relates to the archaeological record and historical chronology of Egypt in light of the ¹⁴C data. We find that these ¹⁴C data, and other recent radiocarbon work, provide good grounds to be confident in the possibility of a robust radiocarbon‐based chronology for the eastern Mediterranean. In contrast, as the radiocarbon case becomes stronger, questions must be asked about some archaeological dating: in particular, at the site of Tell el‐Dab‘a in the Nile Delta of Egypt.     

Abandonment of Minoan palaces on Crete in relation to the earthquake induced changes in groundwater supply

Mysterious abandonment of palaces on Crete during the Late Minoan period was always a challenging problem for archeologists and geologists. Various hypotheses explained this event by effects of tsunamis, earthquakes or climatic changes that were caused by the volcanic eruption of the Santorini volcano. While each of them or their possible combination contributed to the abandonment of palaces and following Late Minoan crisis, there is another possible cause that appeared as a result of studies within the last 20–30 years. This cause is depletion of groundwater supply caused by persistent earthquake activity that took place during the Bronze Age. This explanation is supported by field observations and numerous studies of similar phenomena in other locations.     

A Bronze Age Quarry in Eastern Crete

Abstract

The sandstone quarry at Mochlos is one of four major quarries in eastern Crete that were worked during the New Palace Period of Minoan civilization (ca. 1700–1450 B.C.) to produce large ashlar blocks for nearby Minoan sites. At that time sandstone, or ammoudha, as it is known locally, was especially valued as a building material, partly because of its distinctive color and texture, but mainly because of the ease with which it could be cut, and the stone was used extensively for exterior façades, for walls around interior courts, and for other architectural features of the more important buildings on these sites. This article describes the quarry at Mochlos in some detail, including the quarrying techniques employed, and argues that the destination of the stone from the Mochlos quarry was the Minoan palace at Gournia. The article ends with a comparison of the four ammoudha quarries in eastern Crete.     

New light on old pumice: the origins of Mediterranean volcanic material from ancient Egypt

This paper presents and discusses the Neutron Activation Analysis (NAA) results newly obtained from pumice pieces found decades ago at the Egyptian sites of Maiyana, Sedment, Kahun, and Amarna – now in the collections of the Ashmolean Museum, Oxford, and the Petrie Museum of Egyptian Archaeology, London – which could be successfully related to several volcanic eruptions in the Mediterranean. The work contributes to the constant accumulation of knowledge concerning the first appearance of pumice from the so-called Minoan eruption of the Santorini volcano. In addition, it unexpectedly sheds more light on the long-distance trade of Mediterranean volcanic material in the Bronze Age world by disclosing another connection between Lipari and the Eastern Mediterranean.     

ARCHAEOMETRIC STUDY OF SHELLS OF HELICIDAE FROM THE EDERA CAVE (NORTHEASTERN ITALY)*

The Edera Cave, near Aurisina in the Trieste Karst, retains a stratigraphy that extends from the Mesolithic to the modern era. At Sauveterrian layers, many specimens of Helix cincta are present, which are considerably crushed, and a small percentage of which are also blackened. Chemical analyses show that the blackened specimens were exposed to a temperature of between 500 and 550°C, and suggest that many others were destroyed by fire at temperatures of above 700°C. Consequently, only a part of the Helix cincta shells is assumed to be the residue of human meals, since several factors render plausible an accidental combustion of shells already present in the ground before the lighting of Mesolithic hearths.     

THE SEALING STRUCTURES OF MINOAN CRETE: MM II PHAISTOS TO THE DESTRUCTION OF THE PALACE OF KNOSSOS

Summary. The thousands of MM clay sealings in Room 25 of the First Palace of Phaistos testify to the importation into Crete of the Near Eastern system of storeroom administrative controls. Minoan practice then diverged from the Near Eastern model. The development of a recognizably Minoan sealing system is illustrated by the LM IB sealing deposits from Ayia Triada, Zakro and Khania (with something of its evolution traceable via Mallia and Knossos). Despite many common practices in LM IB, however, important local differences coexisted within this Minoan system, perhaps suggesting the absence of a single overriding administrative authority at this time.     

THE LIFE OF BUILDINGS: MINOAN BUILDING DEPOSITS IN AN ECOLOGICAL PERSPECTIVE

Summary. This paper discusses the interpretation of the objects deliberately hidden and sealed up in the structure of Minoan buildings. These building deposits are usually interpreted in terms of religion and ritual but this conventional view may actually be based on fallacious assumptions about the nature of human-environment relations in Bronze Age Crete. The present paper outlines an alternative ecological approach, which allows a degree of sociality between humans and non-human entities, and treats building deposits as an essentially practical means of manipulating the relations between humans and the (built) environment in situations of potential stress. It will be argued that buildings and other artefacts can, in some respects, be understood to live and grow similarly as organisms. Thus, in order to appreciate their significance, Minoan building deposits need to be related to the life-cycle of buildings.     

Quantification and Visualization of In Situ Degradation at the World Heritage Site Bryggen in Bergen,Norway

Abstract

Environmental monitoring at the World Heritage Site of Bryggen in Bergen, Norway, has shown damaging settling rates caused by degradation of underlying archaeological deposits. Measurements of piezometric head, oxygen, and soil moisture content, as well as chemical analyses of water and soil samples are key elements of the environmental monitoring.

Groundwater monitoring and geochemical analyses reveal a complex and dynamic flow through the natural and anthropogenic stratigraphy. The preservation conditions within the organic archaeological deposits are strongly correlated with oxygen and soil moisture content, that are controlled by the groundwater flow conditions at the site. To quantify decay rates, it is thus essential to understand the wider hydrogeological context of the site. This paper presents recent advancements in quantifying decay rates in the saturated zone at Bryggen. The paper also shows that 3D geo-archaeological modelling can contribute to preservation management by visually combining results of geological, archaeological, geochemical, and hydrological investigations. This opens up for improved multidisciplinary understanding of preservation potential, thereby contributing to an improved protection of archaeological deposits in situ.     

Miocene algae and spores from Tierra del Fuego,Argentina

Continental deposits of the Cullen Formation (early or middle Miocene) exposed on the northeast coast of Isla Grande de Tierra del Fuego (southernmost Patagonia) are analyzed. Twenty-four taxa of algae, and bryophyte and pteridophyte spores are identified, including three new species, which are Anthocerisporis gandolfii sp. nov., Coptospora archangelskyi sp. nov. and Ophioglossisporites cullensis sp. nov. Sedimentologic and palynological data suggest a system of meandering water channels. The diverse and abundant spore assemblage reinforces the proposed paleoenvironment indicated by pollen assemblage and stratigraphy, consisting of humid temperate forests and local occurrences of bog, freshwater and near-shore lake communities.     

On the flow characteristics of the conical Minoan pipes used in water supply systems,via computational fluid dynamics simulations

The Minoan Terracotta pipes with their conical shape were widely used in the water distribution system in the ancient Minoan civilization. They remain one of the brightest achievements of the Minoan tribe in water supply technology and raise admiration as well as many questions about the technological advancements of antiquity, that are yet to be understood. The present work aims at answering the following questions: a) what inspired the Minoans to manufacture pipes with such a peculiar shape, that differs greatly not only from later pipe designs of antiquity, but also from contemporary cylindrical pipes and b) why was the design of those pipes abandoned after the fall of the Minoan civilization? It tries to address these questions by investigating the flow physics and dynamics that take place in such pipes, adopting advanced numerical and computational methods. The time-averaged Navier–Stokes equations along with the k − ? turbulence model are solved for a variety of geometrical parameters, pipe orientations and flow rates, in order to produce a comparative picture of the hydraulic efficiency of the conical Minoan pipes. The flow field is visualized and critical flow parameters, such as the head loss, the velocity magnitude and turbulence intensity, are calculated. These calculations show clearly that the conical Minoan pipes exhibit significantly higher pressure drops along their length compared to an equivalent straight pipe. In their widest part an extended recirculation appears, which could wash out impurities that may be present in the water, which at the same time cannot be deposited on the pipe wall. This evidence proves that the Minoan pipes are energetically expensive to operate and consequently their replacing by cylindrical pipes was inevitable. Therefore, it seems that the main advantage and purpose of the particular geometry was that they could be easily connected on site, forming long straight or slowly bending lines without having to add straight or many different fittings in between.     

PRELIMINARY TECHNICAL OBSERVATIONS ON KNOSSIAN FAIENCE

Summary This preliminary study of a large number of Knossian/Minoan faience objects in the Heraklion (HM) and the Ashmolean (AM) Museums presents observations about the technological development of Knossian faience throughout the life of the Palace. In earlier deposits, such as the Vat Room, simple inlays, beads, and a figure appear; faience became more complex in the succeeding period (Loomweight Basements) and reached its culmination in the Temple Repositories period, where complex inlays and vases and large-scale figures appear.     

Units of Archaeological Stratification

The excavating archaeologists’ methodological set ‐ excavation, recording, analysis and publication ‐ rests on the notions and principles of the stratigraphic succession of archaeological deposits. Since 1954 when Sir Mortimer Wheeler published Archaeology From the Earth, there has been a dearth of published discussion on the stratigraphie theory in archaeology. This paper examines some of the background of the stratigraphie notion in archaeology and a revised model for archaeological stratigraphy based on ‘units of stratification’ is presented. Re‐evaluations of stratigraphie configurations in archaeology arc perhaps long overdue and this article is an attempt to engender discussion on this fundamental archaeological tenet.     

Colour in Minoan faience

The microstructures and chemical compositions of some 15 faience objects from Crete spanning the period from Middle Minoan IIIA through to Late Minoan IA are determined using analytical scanning electron microscopy. The Minoan faience is compared with replicate faience beads produced in the laboratory using various combinations of manganese, copper and iron as colorants. The alkali contents of the replicate beads are varied so that the colorants are present both as ions in a glass phase and as particulate oxides. These data are then used to try to infer the original colour of the Minoan faience, the great majority of which has suffered severe weathering during burial. The results suggest that instead of the present day “hallmark greys and browns” and “subtle greens and blues”, Minoan faience originally exhibited a wide range of colours, including bright turquoise blue, purple and violet, and pale yellow-green and greenish turquoise.     

ABSOLUTE DATING OF THE AEGEAN LATE BRONZE AGE

A recent argument for raising the absolute date of the beginning of the Aegean Late Bronze (LB) Age to about 1700 B.C. is critically examined. It is argued here that: (1) the alabaster lid from Knossos did have the strati-graphical context assigned to it by Evans, in all probability Middle Minoan IIIA, c. 1650 B.C.; (2) the attempt to date the alabastron found in an early Eighteenth Dynasty context at Aniba to Late Minoan IIIA:1 is open to objections; (3) radiocarbon dates from Aegean LB I contexts are too wide in their calibrated ranges and too inconsistent both within and between site sets to offer any reliable grounds at present for raising Aegean LB I absolute chronology to 1700 B.C. Other evidence, however, suggests this period began about 1600 B.C., i.e. some fifty years earlier than the conventional date of 1550 B.C.     

CERAMIC PRODUCTION,PROVENANCE AND USE—A REVIEW*

The contribution of the physical sciences to the reconstruction of the production technology (i.e., processing of raw materials, forming, surface treatments and firing methods) for earthenwares, stonewares, porcelains and stonepaste bodies are summarized. The organization of production and the reasons for technological choice are considered. Provenance studies based on both chemical analysis and thin‐section petrography are discussed, with the investigation of Minoan and Mycenaean pottery being taken as the case study. The approaches to determining how pottery vessels were used in antiquity are outlined. Finally, future developments in ceramic studies are briefly considered.     

THE SEALING STRUCTURES OF MINOAN CRETE: MM II PHAISTOS TO THE DESTRUCTION OF THE PALACE OF KNOSSOS.

Summary. Middle Minoan Knossos shares in the sealing evolution which we have seen elsewhere on the island (SSMC I): the earliest sealings are placed directly on objects, a practice which, in time, generally yields to nodules which hang on cords (first crescents, then prismatic types) and flat-based nodules which were pressed over leather strips, presumably parchment documents. We have no LM IB sealings from Knossos, a site which might have been expected to have evolved its own local version of the Minoan sealing system. Sealings from the final destruction deposits at Knossos are at once closer to the earlier practices from Phaistos and to the later system known from the mainland. The mainland connection is seen in a reduction of sealing shapes (especially the disappearance of flat-based nodule types) and in a non-intensive, non-elite pattern of seal use.     

ANALYSIS OF TILTING AT GOURNIA (CRETE) BY THE REPRESENTATIVE BLOCK METHOD: A GEOLOGICAL—ARCHAEOLOGICAL TECHNIQUE TO ANALYSE HISTORICAL TILTING*

The walls and floors of the Minoan settlement of Gournia (Crete) have retained a perpendicular relationship since their construction between 3650 and 2025 BC. Their present orientation indicates that they were tilted in unison in an east-south-east direction. This was established by the reconstruction of a representative block, of which the side planes and the base plane were defined by the present orientation of the wall and floor remnants respectively. Stereographic projection methods, derived from geological practice, were used to determine the geometric elements and the orientation of the representative block.     

RIETVELD X-RAY DIFFRACTION AND X-RAY FLUORESCENCE ANALYSIS OF AUSTRALIAN ABORIGINAL OCHRES*

Rietveld phase analysis of X-ray powder diffraction patterns and chemical analysis by X-ray fluorescence spectroscopy have been used to characterize a series of red and yellow ochre samples from Aboriginal ochre deposits in South and Western Australia. The ochres were found to have diverse mineralogy, being mixtures of up to seven minerals, and also to have complex trace element signatures. The mineralogical characteristics and geochemistry of the ochres can be used to identify the source quarries. Using this combination of analytieal techniques it may be possible to trace the source of ochres in burial sites and on objects back to the original quarries.