The paleo-Etel River incised valley on the Southern Brittany inner shelf (Atlantic coast, France): Preservation of Holocene transgression within the remnant of a middle Pleistocene incision?

Estournès, Guilhem; Menier, David; Guillocheau, François; Roy, Pascal Le; Paquet, Fabien; Goubert, Évelyne

doi:10.1016/j.margeo.2012.08.005

Cited by 17 publications

(5 citation statements)

References 43 publications

(91 reference statements)

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“…As previously observed for core VC-08, Corylus increases are concomitant with peaks of pollen concentrations and of L. machaerophorum percentages. Finally, higher percentages of H. germanica and A. tepida (Figure 10), benthic foraminiferal species subordinate to environments under fluvial influences (Debenay et al, 2006; Estournès et al, 2012; Perez-Belmonte, 2008), confirm previous observations of increasing fluvial discharges probably related to increasing moisture.…”

Section: Climate Impacts and Land-use Changessupporting

confidence: 88%

“…Finally, higher percentages of H. germanica and A. tepida (Fig. 10), benthic foraminiferal species subordinate to environments under fluvial influences (Debenay et al 2006;Perez-Belmonte, 2008;Estournès et al 2012), confirm previous observations of increasing fluvial discharges probably related to increasing moisture.…”

Section: Climate Impacts and Land-use Changessupporting

confidence: 86%

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Palaeoenvironmental reconstructions during the Meso- to Neolithic transition (9.2–5.3 cal. ka BP) in Northwestern France: Palynological evidences

et al. 2018

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Sedimentological, palynological, and micropalaeontological studies carried out throughout the first half of the Holocene, during the Mesolithic/Neolithic transition in the Bay of Brest (i.e. 9200-9000 and 6600-5300 cal. BP) and in the Bay of Douarnenez (i.e. 9200-8400 cal. BP), allowed characterizing coastal environmental changes under the increasing influence of the relative sea-level rise. The gradual flooding of the two studied sites implied a transition from river valleys to oceanic bays as revealed by the gradual retreat of salt marsh environments, as detected through palynological analysis. In addition, these high-resolution studies highlight the regional imprint of the North Atlantic millennial climate variability in northwestern coastal environments. Two cold climate events are indeed suggested to have been locally marked by a moisture increase, mainly detected by increases in Lingulodinium machaerophorum, Corylus, and Alnus percentages at 8550 cal. BP in the Bay of Douarnenez and at 6250 cal. BP in the Bay of Brest. Moreover, regarding the Neolithic transition timing in the Bay of Douarnenez, large pollen grains of Poaceae (i.e. Cerealia-type pollen grains) have been detected at around 8600 cal. BP, that is, 1500 years before the general accepted cereal cropping appearance in Western France. These results, consistent with other palynological studies conducted in the French Atlantic coast, could underline a Mesolithic 'proto-agriculture' in Brittany.

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Section: Climate Impacts and Land-use Changessupporting

confidence: 88%

Section: Climate Impacts and Land-use Changessupporting

confidence: 86%

Palaeoenvironmental reconstructions during the Meso- to Neolithic transition (9.2–5.3 cal. ka BP) in Northwestern France: Palynological evidences

et al. 2018

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“…The steep inner to mid-shelf (0–100 m) bathymetric profile (Figure 1b) makes our study area close to the upper coastal habitats, explaining the large abundance of epiphytes and the difference with the nearby site G located more distantly from the continent (Figure 1b; Duchemin et al, 2008). On the larger southern Brittany inner shelf (Bay of Etel; Figure 1b, vk16), a very similar Holocene fossil assemblage dominated by epiphytes was found in a core retrieved at ~30 m water depth (Estournès et al, 2012).…”

Section: Discussionmentioning

confidence: 73%

“…The locations of core CBT-CS11 (this study) and the other cited cores in the text are indicated: VK03-58/59bis (Naughton et al, 2007); KV14-bis (Durand et al, 2018); ProsecanKS10b (Mojtahid et al, 2013); PP10-07 (Brocheray et al, 2014). Map performed using the online EMODnet Portal for Bathymetry (http://www.emodnet-bathymetry.eu/); (b) zoom on the study site, and the location of the nearby cores St G (Duchemin et al, 2008) and vk16 (Estournès et al, 2012). ENAW: Eastern North Atlantic Water; EPC: European Poleward Current.…”

Section: Introductionmentioning

confidence: 99%

Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘La Grande Vasière’ mid-shelf mud belt

et al. 2018

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A mid- to late-Holocene paleohydrological reconstruction from the northeast Atlantic is proposed through the study of a high-resolution sedimentary record from the northern continental shelf of the Bay of Biscay (BoB). Three foraminiferal species dominate the assemblages with Rosalina globularis showing an overall decrease in absolute and relative abundances from ~7 to 0.4 cal. ka BP, whereas the opposite trend is observed for Cibicides refulgens and Lobatula. These long-term patterns are interpreted as a response to the overall cooling trend and/or the progressive deepening of the water column because of the relative sea-level (RSL) rise. Foraminiferal δ18O and grain-size analyses show a significant shift around 3.5–2.5 cal. ka BP toward a heavier isotopic signature and finer sediments. We mainly link this change to enhanced contribution of continental freshwaters and fine sediments after the near-stabilization of the RSL rise. By reducing coastal accommodation spaces, this led to a better channelization of river outflows and probably to the formation of the modern winter thermohaline front. Superimposed on these long-term patterns, our data highlight strong millennial-scale variability (1250-year peak). Such cyclicity is consistent with several records tracing changes in rainfall and storminess regimes in northern Europe, and the dynamics of the subpolar gyre (SPG). We suggest a millennial time-scale control of a NAO-like (North Atlantic Oscillation) climatic process modulating continental humidity (and the associated river discharges) and SPG dynamics through wind stress. Spectral analyses reveal an additional 500-year frequency peak implying a possible solar forcing.

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“…Incised valleys scattered over the world are witnesses of the last sea-level drop and lowstand phase associated to the Last Glacial Maximum (e.g. Lericolais et al, 1998Lericolais et al, , 2001Lericolais et al, , 2003Blum and Törnqvist, 2000;Huuse and Lykke-Andersen, 2000;Lin et al, 2005;Nordfjord et al, 2005Nordfjord et al, , 2006Mattheus et al, 2007;Chaumillon et al, 2008Chaumillon et al, , 2010Vis and Kasse, 2009;Amorosi et al, 2009Amorosi et al, , 2012Amorosi et al, , 2013Amorosi et al, , 2016Ngueutchoua and Giresse, 2010;Labaune et al, 2010;Tanabe et al, 2010Tanabe et al, , 2013Estournès et al, 2012;Green et al, 2013;Tropeano et al, 2013;Blum et al, 2013;Longhitano et al, 2015;Breda et al, 2016;Peeters et al, 2016;Gregoire et al, 2017;Gibbard et al, 2017;De Clercq et al, 2018). In post-LGM times, most of these valleys were transgressively infilled in the interplay between continental and marine processes owing to post-glacial sea-level rise.…”

Section: Introductionmentioning

confidence: 99%

Late Quaternary landscape evolution of the buried incised valley of Concordia Sagittaria (Tagliamento River, NE Italy): A reconstruction of incision and transgression

et al. 2021

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The paleo-Etel River incised valley on the Southern Brittany inner shelf (Atlantic coast, France): Preservation of Holocene transgression within the remnant of a middle Pleistocene incision?

Cited by 17 publications

References 43 publications

Palaeoenvironmental reconstructions during the Meso- to Neolithic transition (9.2–5.3 cal. ka BP) in Northwestern France: Palynological evidences

Palaeoenvironmental reconstructions during the Meso- to Neolithic transition (9.2–5.3 cal. ka BP) in Northwestern France: Palynological evidences

Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘La Grande Vasière’ mid-shelf mud belt

Late Quaternary landscape evolution of the buried incised valley of Concordia Sagittaria (Tagliamento River, NE Italy): A reconstruction of incision and transgression

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