Variations du niveau marin Holocène en Baie de Quiberon (Bretagne sud) : marqueurs archéologiques et sédimentologiques

Baltzer, Agnès; Cassen, Serge; Walter-Simonnet, Anne-Véronique; Clouet, Hélène; Lorin, André; Tessier, Bernadette

doi:10.4000/quaternaire.7201

Cited by 8 publications

(4 citation statements)

References 25 publications

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“…-Martinez et al, 2017;Maanan et al, 2014Maanan et al, , 2018Maanan et al, , 2015Ning et al, 2018;Yim et al, 2018), environmental changes such as sea level rise (e.g. Baltzer et al, 2015;Culver et al, 2015;Fruergaard et al, 2015;Lambeck and Bard, 2000) and past storms detection (e.g. Bennington and Farmer, 2014;Parris et al, 2010;Parsons, 1998).…”

Section: Sampling Methodsmentioning

confidence: 99%

Temporal approaches of historical extreme storm events based on sedimentological archives

Pouzet

Maanan

2020

Journal of African Earth Sciences

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This paper presents the benefits of multiplying environmental indicators to better understand the impacts of past storm events on the environment. It aims to describe the methodological approaches used to reconstruct past extreme events from washover deposits, at the three main temporal scales used in scientific bibliography: i) the long timescale (Holocene, since 12 000 years BP), ii) the meso timescale (for the last millenary) and iii) the short timescale (Anthropocene, for the last centuries). This methodology is based on a "multiproxy" analysis using sedimentology, geochemistry and various methods of isotope dating. Linking these methods with other disciplines such as history, archaeology and meteorology leads us to confirm with great certainty the existence of these extreme events, and to expose their impacts on the environment and on past coastal societies. These different approaches enable us to enhance and refine our knowledge of coastal hazards, but also to apprehend possible storm influences in the context of climate change.

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Section: Sampling Methodsmentioning

confidence: 99%

Temporal approaches of historical extreme storm events based on sedimentological archives

Pouzet

Maanan

2020

Journal of African Earth Sciences

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“…The two semicircular stone monuments, each 50-60 m wide, are located on the southern end of Er Lannic. After its construction by Neolithic humans, the site was submerged due to the rise in sea level during the post-glacial marine transgression [32]. The coastline of the Gulf of Morbihan is estimated to have been ca.…”

Section: Study Areamentioning

confidence: 99%

“…The coastline of the Gulf of Morbihan is estimated to have been ca. 5 m below the current sea level during the Neolithic period [32]. The megalithic site of Er Lannic ( Figure 2) was first mentioned in 1866 by archaeologist G. de Closmadeuc [33].…”

Section: Study Areamentioning

confidence: 99%

Airborne Hyperspectral Imaging for Submerged Archaeological Mapping in Shallow Water Environments

Guyot

Lennon²,

Thomas³

et al. 2019

Remote Sensing

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Nearshore areas around the world contain a wide variety of archeological structures, including prehistoric remains submerged by sea level rise during the Holocene glacial retreat. While natural processes, such as erosion, rising sea level, and exceptional climatic events have always threatened the integrity of this submerged cultural heritage, the importance of protecting them is becoming increasingly critical with the expanding effects of global climate change and human activities. Aerial archaeology, as a non-invasive technique, contributes greatly to documentation of archaeological remains. In an underwater context, the difficulty of crossing the water column to reach the bottom and its potential archaeological information usually requires active remote-sensing technologies such as airborne LiDAR bathymetry or ship-borne acoustic soundings. More recently, airborne hyperspectral passive sensors have shown potential for accessing water-bottom information in shallow water environments. While hyperspectral imagery has been assessed in terrestrial continental archaeological contexts, this study brings new perspectives for documenting submerged archaeological structures using airborne hyperspectral remote sensing. Airborne hyperspectral data were recorded in the Visible Near Infra-Red (VNIR) spectral range (400–1000 nm) over the submerged megalithic site of Er Lannic (Morbihan, France). The method used to process these data included (i) visualization of submerged anomalous features using a minimum noise fraction transform, (ii) automatic detection of these features using Isolation Forest and the Reed–Xiaoli detector and (iii) morphological and spectral analysis of archaeological structures from water-depth and water-bottom reflectance derived from the inversion of a radiative transfer model of the water column. The results, compared to archaeological reference data collected from in-situ archaeological surveys, showed for the first time the potential of airborne hyperspectral imagery for archaeological mapping in complex shallow water environments.

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“…Some are currently submerged or overlaid by sand dunes (Cassen et al, 2010(Cassen et al, , 2019Giot, 1998;Giot & Morzadec, 1992), highlighting significant coastal paleogeographic changes since the Neolithic in response to relative sea-level (RSL) rise. However, megalithic monuments studies that integrate reconstructions of paleocoastal environments are relatively new, such as those on the Molène Archipelago (Northwestern Brittany, Pailler et al, 2011;Stéphan et al, 2019) and Quiberon Bay (Southern Brittany, Baltzer et al, 2015;Cassen et al, 2012). Paleoenvironmental reconstructions provide additional evidence for understanding the reasoning used by Neolithic people for their site selection and the organisation of their coastal territories.…”

mentioning

confidence: 99%

An interdisciplinary approach to Late/Final Neolithic coastal gallery graves in Brittany, Western France: The 3D structure, origin of stone material, and paleoenvironmental setting of the Kernic and Lerret monuments

et al. 2023

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This article presents an interdisciplinary study of two Late/Final Neolithic gallery graves (Kernic and Lerret) located on the orthwestern coast of Brittany (Western France). These monuments show striking similarities in terms of architectural style and geographical position. This paper aims to provide a better understanding of the construction strategy of these monuments by (i) determining the origin of the megalithic blocks using comparative petro‐structural analyses of blocks and surrounding rocks, (ii) reconstructing the coastal environment from sediment core analyses and (iii) defining the significance of these monuments in the territories from an intervisibility analysis. The study reveals marked differences between the two monuments studied. The Lerret gallery grave was erected close to a unique source of stone material on the margins of a marshland zone. In contrast, the Kernic monument, erected on the edge of an estuary, seems to have been built using a deliberate diversification of stone extraction sites. An intervisibility analysis shows a dense network of visual interconnections between a number of megalithic tombs present in the study area, where the two monuments occupy very distinct sites. The social implications of stone selection and the geographical location of Late/Final Neolithic funerary monuments are also discussed in an enlarged regional context.

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Variations du niveau marin Holocène en Baie de Quiberon (Bretagne sud) : marqueurs archéologiques et sédimentologiques

Abstract: International audienc

Cited by 8 publications

References 25 publications

Temporal approaches of historical extreme storm events based on sedimentological archives

Temporal approaches of historical extreme storm events based on sedimentological archives

Airborne Hyperspectral Imaging for Submerged Archaeological Mapping in Shallow Water Environments

An interdisciplinary approach to Late/Final Neolithic coastal gallery graves in Brittany, Western France: The 3D structure, origin of stone material, and paleoenvironmental setting of the Kernic and Lerret monuments

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