Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The interpretation of high-resolution 2D marine seismic profiles together with the analysis of sea-bottom cores allowed a stratigraphic and structural framework of the Provence continental shelf to be proposed. The integration of onshore and offshore stratigraphy, structure and geomorphology provided new insights into Messinian paleotopography and paleohydrography. A geological map of the offshore Provence continental shelf, isobath map of the base Plio-Quaternary surface are presented for the first time in this area. The base Plio-Quaternary surface is a polyphased unconformity that is composed of deep canyons developed by fluvial erosion during the Messinian event, and wave-cut surfaces formed during post-Messinian transgressions. The study evidenced a deep, E-W-trending canyon (Bandol canyon) connected to the head of the Cassidaigne canyon, and filled with up to 600 m-thick Plio-Quaternary deposits. The development of canyons on the Provence margin during the Messinian event was dominantly controlled by the lithology and structure of pre-Messinian formations. A map of the Messinian paleo-drainage network is proposed to explain the presence of deep canyons in the Eastern area and the lack of incision in the Western area. An underground karst drainage scheme is proposed, linked with the current submarine Port-Miou spring.
ISSN: 0264-8172

insu-01009592
https://hal-insu.archives-ouvertes.fr/insu-01009592
https://hal-insu.archives-ouvertes.fr/insu-01009592/document
https://hal-insu.archives-ouvertes.fr/insu-01009592/file/Mar-Pet-Tassy.pdf
DOI : 10.1016/j.marpetgeo.2014.05.001

Éditeur(s) : Elsevier
Résumé : In the Gulf of Gabes (Tunisia, Eastern Mediterranean sea), the grooved carpet shell Ruditapes decussatus has been seen to contain persistent levels of gymnodimine (GYM) for several years. The present experimental work represents the first attempt to assess detoxification kinetics of fast-acting toxins (FAT) in marine molluscs fed specific diets of non-toxic algae (Isochrysis galbana). To find an optimal detoxification method, two experiments were performed in which clams were first fed the toxic dinoflagellate Karenia selliformis to artificially contaminate them with GYM, thus simulating the effect of natural toxic episodes. As a second step, the same clams were fed a non-toxic algae, I. galbana. to speed up the detoxification process. Changes in toxin content over the whole experiment were assessed by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) analysis. The first results revealed (i) faster detoxification rates in digestive gland (DG) when clams were fed on L galbana compared with a starved control (no food) and (ii) a typical detoxification pattern, i.e. a rapid drop in toxin content within the first days followed by a secondary slower decrease. GYM levels could be reduced approximately to less than 5% within 7-8 days in clams fed I. galbana, according to the initial toxin levels of 1400 and 9400 mu g GYM/kg of DG, respectively. At the end of the second experiment, DSP mouse bioassay was negative when GYM was less than 100 mu g/kg DG. (C) 2009 Elsevier B.V. All rights reserved.
Harmful Algae (1568-9883) (Elsevier), 2010-02 , Vol. 9 , N. 2 , P. 200-207

Droits : 2010 Elsevier Ltd All rights reserved.
http://archimer.ifremer.fr/doc/2010/publication-7488.pdf
DOI:10.1016/j.hal.2009.10.002
http://archimer.ifremer.fr/doc/00000/7488/

Résumé : Ce document vise à fournir des informations concernant la situation des différents stocks et la capacité des flottilles françaises et communautaires sur ces stocks. Il met à disposition des données permettant de mesurer : 1. l'évolution de la capacité physique de la flotte française. Celle-ci est abordée à travers la puissance nominale totale (kW), la puissance moyenne (kW) et le nombre de navires. L'évolution de ces indicateurs est fournie depuis 1983 pour la façade Mer du Nord – Manche – Atlantique et la façade Méditerranée, depuis 1997 pour les Départements d'Outre Mer (DOM). Dans un premier temps, l'ensemble des navires français inscrits au fichier flotte sont pris en compte. Dans un second temps, seuls les navires actifs sont retenus en distinguant des segments de flotte selon le rayon d'action [« côtier », « mixte », « large »] puis la catégorie de longueur. Enfin, une comparaison est faite de l'évolution du nombre de navires et de la puissance nominale totale (kW) entre les treize Etats membres qui ont une façade maritime depuis 2000. 2. l'évolution de l'activité de la flotte par engin . Celle-ci est appréhendée à travers l'évolution du nombre de navires et du nombre de mois d'activité par engin, depuis 2000 pour la façade Mer du Nord – Manche – Atlantique et depuis 2003 pour la façade Méditerranée. L'évolution de ces indicateurs par rayon d'action pour chaque engin est également abordée. 3. l'évolution de la contribution des différents segments de flotte aux débarquements ainsi qu'à la puissance nominale totale, par stock . L'indicateur calculé ici est la part (pourcentage) des débarquements et de la puissance nominale totale par segment de flotte (rayon d'action et catégorie de longueur) dans un premier temps, par engin ou classe de longueur et par stock, dans un second temps. 4. la comparaison entre la production française sur les différents stocks, la production globale et les niveaux de prélèvements recommandés par les avis scientifiques. L'indicateur calculé ici, est un indicateur biologique, proposé par la Commission européenne, et calculé, pour chaque flottille, comme le ratio entre la mortalité estimée et la mortalité cible. Cet indicateur mesure l'adéquation entre la capacité utilisée (effort de pêche) et la disponibilité des ressources. Ce n'est pas un indicateur d'une éventuelle capacité physique.

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/00001/11213/7587.pdf
http://archimer.ifremer.fr/doc/00001/11213/

Éditeur(s) : Pergamon-elsevier Science Ltd
Résumé : We report the northernmost and deepest known occurrence of deep-water pycnodontine oysters based on two surveys along the French Atlantic continental margin to the La Chapelle continental slope (2006) and the Guilvinec Canyon (2008) The combined use of multibeam bathymetry seismic profiling CTD casts and a remotely operated vehicle (ROV) made it possible to describe the physical habitat and to assess the oceanographic control for the recently described species Neopycnodonte zibrowii These oysters have been observed in vivo in depths from 540 to 846 m colonizing overhanging banks or escarpments protruding from steep canyon flanks Especially in the Bay of Biscay such physical habitats may only be observed within canyons where they are created by both long-term turbiditic and contouritic processes Frequent observations of sand ripples on the seabed indicate the presence of a steady but enhanced bottom current of about 40 cm/s The occurrence of oysters also coincides with the Interface between the Eastern North Atlantic Water and the Mediterranean Outflow Water A combination of this water mass mixing internal tide generation and a strong primary surface productivity may generate an enhanced nutrient flux which is funnelled through the canyon When the ideal environmental conditions are met up to 100 individuals per m(2) may be observed These deep-water oysters require a vertical habitat which is often incompatible with the requirements of other sessile organisms and are only sparsely distributed along the continental margins The discovery of these giant oyster banks illustrates the rich biodiversity of deep-sea canyons and their underestimation as true ecosystem hotspots (C) 2010 Elsevier Ltd All rights reserved
Deep-sea Research Part I-oceanographic Research Papers (0967-0637) (Pergamon-elsevier Science Ltd), 2010-12 , Vol. 57 , N. 12 , P. 1561-1572

Droits : 2010 Elsevier Ltd All rights reserved.
http://archimer.ifremer.fr/doc/00023/13419/14034.pdf
DOI:10.1016/j.dsr.2010.09.002
http://archimer.ifremer.fr/doc/00023/13419/

Éditeur(s) : Pergamon-elsevier Science Ltd
Résumé : The environment is impacted by natural and anthropogenic disturbances that occur at different spatial and temporal scales, and that lead to major changes and even disequilibria when exceeding the resiliency capacities of the ecosystem. With an annual mean flow of 1700 m(3) s(-1), the Rhone River is the largest of the western Mediterranean basin. Its annual solid discharges vary between 2 and 20 Mt, with flood events responsible for more than 70% of these amounts. In the marine coastal area, close to the mouth, both flocculation and aggregation lead to the formation of fine-grained deposits, i.e. the prodelta. This area is characterized by sediment accumulation rates up to 20-50 cm yr(-1) and high accumulations of particle reactive contaminants such as various man-made radionuclides released into the river by nuclear facilities or arising form prior atmospheric nuclear tests (1954-1980) and the Chernobyl accident (April 1986). This prodelta, however, cannot be considered as a permanent repository for particle reactive pollutants since it is subjected to reworking processes. Sediment dynamics had to be linked to the influences of hydrodynamic and atmospheric events such as high flow rates or storms close to the Rhone River mouth. An experiment was carried out during the winter 2006 based on the deployment of two ADCPs and six altimeters at the Grand Rhone mouth for several months. This type of installation has never been used before in this area because of the hard meteorological conditions and the strong fishing activities. However, results showed pluricentimetric rises of the sedimentary level just after river flood events and decreases during storms, generated by southeast winds. Radiotracers and grain size depth profiles helped to characterise the studied events and to establish inventories of sediments and radionuclides. A cruise (CARMEX) was carried out during this same period to collect water samples, suspended particles and sediment cores. The results enabled us to link both river flow and wind characteristics to events recorded on the sea floor, i.e. resuspension, accumulation, consolidation, etc. Deposits of 11 cm of sediments were estimated during flood periods and bottom shear stresses up to 5 N m(-2) were calculated during sediment erosion phases. (C) 2010 Elsevier Ltd. All rights reserved.
Continental Shelf Research (0278-4343) (Pergamon-elsevier Science Ltd), 2010-05 , Vol. 30 , N. 9 , P. 1095-1107

Droits : 2010 Elsevier B.V. All rights reserved.
http://archimer.ifremer.fr/doc/00006/11695/8479.pdf
DOI:10.1016/j.csr.2010.02.015
http://archimer.ifremer.fr/doc/00006/11695/

Éditeur(s) : European Association of Fish Pathologists (EAFP)
Résumé : High levels of mortalities (20%) associated with abnormal swimming have been observed in farmed juveniles of seabass, Dicentrarchus labrax, in Mediterranean coast, southern France. Histopathology was obvious in the brain with nervOUS tissue necrosis and the presence of ceUs containing basophilic granules corresponding to smaU coccoid organisms. Ultrastructural examination revealed these organisms were rickettsia-like organisms morphologicaUy close to Piscirickettsia salmonis
Bull. Eur. Ass. Fish Pathol. (European Association of Fish Pathologists (EAFP)), 1996 , Vol. 16 , N. 1 , P. 30-32

Droits : European Association of Fish Pathologists (EAFP)
http://archimer.ifremer.fr/doc/1996/publication-6158.PDF
http://archimer.ifremer.fr/doc/00000/6158/

Éditeur(s) : Elsevier
Résumé : Bioaccumulation is difficult to document because responses differ among chemical compounds, with environmental conditions, and physiological processes characteristic of each species. We use a mechanistic model, based on the Dynamic Energy Budget (DEB) theory, to take into account this complexity and study factors impacting accumulation of organic pollutants in fish through ontogeny. The bioaccumulation model proposed is a comprehensive approach that relates evolution of hake PCB contamination to physiological information about the fish, such as diet, metabolism, reserve and reproduction status. The species studied is the European hake (Merluccius merluccius, L. 1758). The model is applied to study the total concentration and the lipid normalised concentration of 4 PCB congeners in male and female hakes from the Gulf of Lions (NW Mediterranean sea) and the Bay of Biscay (NE Atlantic ocean). Outputs of the model compare consistently to measurements over the life span of fish. Simulation results clearly demonstrate the relative effects of food contamination, growth and reproduction on the PCB bioaccumulation in hake. The same species living in different habitats and exposed to different PCB prey concentrations exhibit marked difference in the body accumulation of PCBs. At the adult stage, female hakes have a lower PCB concentration compared to males for a given length. We successfully simulated these sex-specific PCB concentrations by considering two mechanisms: a higher energy allocation to growth for females and a transfer of PCBs from the female to its eggs when allocating lipids from reserve to eggs. Finally, by its mechanistic description of physiological processes, the model is relevant for other species and sets the stage for a mechanistic understanding of toxicity and ecological effects of organic contaminants in marine organisms.
Journal of Sea Research (1385-1101) (Elsevier), 2009-10 , Vol. 62 , N. 2-3 , P. 124-134

Droits : 2009 Elsevier B.V. All rights reserved.
http://archimer.ifremer.fr/doc/2009/publication-6789.pdf
DOI:10.1016/j.seares.2009.02.006
http://archimer.ifremer.fr/doc/00000/6789/

Éditeur(s) : Elsevier
Résumé : The composition of the glacial vegetation of southern French plains has been a matter of debate for several decades. Vegetation is considered as steppic according to French and Spanish lacustrine pollen records whereas cave deposits suggest the presence of mesothermophilous trees through the Last Glacial Maximum. In our paper, we display new palynological records from marine sediments of the Gulf of Lions. They indicate the presence of Abies, Picea and deciduous Quercus in the Gulf of Lions, certainly located in the drainage basins of the Pyreneo-Languedocian rivers. These populations that were sensitive to short climatic events during Marine Isotopic Stage 2 could have been linked to northeastern Spanish and southeastern French relicts already evidenced by phylogenetic data. These trees were absent from the Rhone drainage basin during the deglaciation and certainly also disappeared from the Pyreneo-Languedocian drainage basins from ca 17 to 15 ky cal BP. Finally, the Last Glacial Maximum does not appear as stable, cold and dry as previously thought.
Quaternary Science Reviews (0277-3791) (Elsevier), 2007-04 , Vol. 26 , N. 7-8 , P. 1037-1054

Droits : 2007 Elsevier Ltd All rights reserved.
http://archimer.ifremer.fr/doc/2007/publication-2804.pdf
DOI:10.1016/j.quascirev.2006.12.009
http://archimer.ifremer.fr/doc/00000/2804/

Éditeur(s) : Université de Montpellier II
Résumé : The sea bass, Dicentrarchus labrax, has been subjected to intensive aquaculture on the Mediterranean cost for ten years. Marine fish hatcheries are key factors in the aquaculture field, and face different pathologies, especially one of viral origin (nodavirus) that could challenge their feasibility. Consequently, we have tried to provide some data on larvae and spawning stocks. Firstly, we have studied the immunoglobulins, components of the specific humoral immunity, and their role as antibodies. On adult basses, these immunoglobulins are tetrameric molecules with high molecular weight (850 kD), made of heavy (H) - 80 kD and light (L) - 26 kD chains. In the eggs, simplest forms such as monomeric or dimeric are brought to the fore; they are located under the chorionic membrane. Secondly, we have studied the development of the immunity system on larvae, preparing IgM assays with ELISA method, the study on the organogenesis of the main lymphoid organs, and using flow cytometry for the ontogenesis of IgM producing cell. Based on this experience, we can propose a date for the immunocompetence onset of the bar, i.e. from the 54th day of the hatchery phase. Finally, we made the most of these different results to study a viral pathology (nodavirus) in spawners and larvae. We defined an experimental contamination model for larvae and eggs, and we highlighted that eggs born from vaccinated hen fishes were protected against the nodavirus.
Le bar, Dicentrarchus labrax, fait l'objet d'une aquaculture intensive sur le littoral Méditerranéen depuis une dizaine d'années. Les écloseries marines représentent un des maillons clefs de cette filière aquacole, et sont confrontées à différentes pathologies, dont une d'origine virale (nodavirus), pouvant remettre en cause leur faisabilité. Aussi, nous avons tenté d'apporter quelques données concernant la protection des larves et des géniteurs reproducteurs. Dans un premier temps, nous avons étudié les immunoglobulines, éléments de l'immunité spécifique humorale ainsi que leur rôle anticorps. Chez les bars adultes ces immunoglobulines sont des molécules tétramériques de haut poids moléculaire (850 kD), composées de chaînes lourdes (H) de 80 kD et légères (L) de 26 kD. Dans les oeufs, des formes plus simples, monomériques ou dimériques, sont mises en évidence et sont localisées sous la membrane chorionique. Dans un second temps, nous avons étudié la mise en place du système immunitaire spécifique chez les larves, en effectuant le dosage des IgM par ELISA, l'étude de l'organogenèse des principaux organes lymphoïdes, puis celle de l'ontogenèse des cellules productrices d'IgM par cytométrie de flux. L'ensemble de cette étude nous permet de proposer une date d'acquisition de l'immunocompétence à partir du 54ème jour d'élevage chez le bar. Enfin, ces différents résultats ont été mis à profit dans le cadre d'une pathologie virale (nodavirus) touchant les reproducteurs et les larves. Après avoir défini un modèle de contamination expérimental des larves et des oeufs, nous avons mis en évidence une protection des oeufs lorsque ceux-ci proviennent d'une femelle vaccinée (vaccin expérimental) contre le nodavirus.

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/1997/these-1265.pdf
http://archimer.ifremer.fr/doc/00000/1265/

Éditeur(s) : HAL CCSD Coastal Education and Research Foundation
Résumé : Nearshore bars are generally present on sandy coasts and play a significant role in wave breaking and sediment exchange between beach and shoreface. The study area is located on the Languedoc-Roussillon coast in the Gulf of Lions (southern part of the French Mediterranean coast). This microtidal environment is classified as a wave-dominated coast. The sand coast displays different bar systems (single or multiple; straight or crescentic). The alongshore variability of bar morphology in the nearshore zone was investigated in August 2009 during one week, using a topo-bathymetric LIDAR data set (300 km(2)). LIDAR makes it possible to cover a large area in a very short time with a high resolution. The topo-bathymetric LIDAR offers the added benefit of morphological information about the beach-sea transition in very shallow water (below I in), data often difficult if not impossible to obtain with traditional techniques. The purpose of this paper is 1) to depict the distribution of bars and their characteristics along the 180 km coast of the Gulf of Lions; 2) to update the classifications of sand bars typologies in Languedoc-Roussillon; 3) to pay particular attention to the description of the intricate inner system. Globally, cross-shore distribution of subtidal morphologies is characterized by both an outer and an inner system. The outer system is crescent-shaped in the south and straight in the northern part with a distinctive regional delimitation. The inner system comprises an inner bar and, near the coast, a complex fluctuating bar called Low Bar Beach (LBB). Several intermediate states were identified and added to the new classification proposed in this paper. These results clearly emphasize the importance of LIDAR technology for a better understanding of bar behaviour and single and/or multi-bar beach organisation.
ISSN: 0749-0208

hal-00783187
https://hal.archives-ouvertes.fr/hal-00783187

Éditeur(s) : CNEXO
Résumé : The analysis of cores taken during the drilling operation of the Terebel's cruise in the northwestern Mediterranean Sea has put into evidence some reworked sediments. However, the occurence of Gtobigerina pachyderma, Gtoborotatia truncatutinoides and Hyalinea balthica gives a quaternary age to these deposits (not older than Sicilian). The microfauna variations in some cores are related to paleoclimatological changes. Some of the sedimentary levels were deposited during a warming interglacial period. [NOT CONTROLLED OCR]
Résultats des Campagnes à la Mer (CNEXO), 1971 , Vol. 2 , N. 107 , P. 313-321

Droits : CNEXO
http://archimer.ifremer.fr/doc/1971/publication-4904.pdf
http://archimer.ifremer.fr/doc/00000/4904/

Éditeur(s) : Inter-research
Résumé : Marine protected areas (MPAs) have the potential to enhance the long-term sustainability of coastal resources, and the artisanal fisheries which depend on them. However, recreational fisheries, which are increasing their impacts on coastal resources worldwide, may reduce the benefits that MPAs provide to declining artisanal fisheries. Here we used the Bonifacio Straits Natural Reserve (BSNR) Corsica as a study case to simulate the combined effects on coastal resources of artisanal and recreational fishing efforts. The BSNR ecosystem was modelled using mass-balance modelling of trophic interactions. This model was compared to another built on a non-protected area from the same region. We aggregated fishing fleets into artisanal and recreational categories, and we simulated various combinations of fishing effort over a 20 yr dynamic simulation using Ecosim. We showed that fishing activities have an additional top-down effect on the food web and that they decrease the targeted group's biomass, such as piscivorous species. We found, for some trophic groups, non-trivial patterns of biomass variation through trophic cascades. Our trophic approach revealed that some groups may suffer a biomass decrease when MPAs are set or enforced, due to the combined effect of artisanal and recreational fisheries. Overall, our results illustrate the value of modelling to manage MPAs, as a complementary tool to surveys. Models provide the opportunity to anticipate the potential consequences, at the ecosystem level, of socio-political decisions that aim to sustain coastal resources while managing artisanal and recreational fisheries.
Marine Ecology-progress Series (0171-8630) (Inter-research), 2010-08 , Vol. 412 , P. 207-221

Droits : Inter-Research 2010
http://archimer.ifremer.fr/doc/00013/12436/9246.pdf
http://archimer.ifremer.fr/doc/00013/12436/9247.pdf
DOI:10.3354/meps08679
http://archimer.ifremer.fr/doc/00013/12436/

Éditeur(s) : ISTPM
Résumé : The Atlantic and Mediterranean members of the scorpaenidae family have always triggered numerous discussions about their reciprocious congenialities. Back in the (recent) days when the number of species known on the French coasts was still fairly low, the belonging of one species to such or such genus, as Helicolenus (Sebastes) dactylopterus DELAROCHE or Scorpaena maderensis Cuvier and Valenciennes, has been the subject of numerous articles of which the authors' conclusions might differ from one another, and even today light is still far from being shed on those topics. The difficulties met in the determination of scorpaenidae: similar general appearance, subtle differences, impossibility of comparing the samples with the types, incomplete or misinterpreted descriptions, have lead scientists to make hasty determinations resulting in: an even more complicated synonymy and incorrect data about the biogeography of the species. Thereby, the rockfish named Scorpaena rubellio by JORDAN and GUNN (I) is considered as a synonymous of S. maderensis Cuvier Valenciennes by J. R. NORMAN (2), and of S. porcus Linné by H. W. FOWLER (3). Likewise, the dispersion area of S. scrofa in Guinea, Niger and Sainte-Hélène, is caused by its confusion with other species such as S. stephanica, S. angolensis and S. scrofina. (unverified OCR)
Les représentants de la famille des Scorpénidés dans l'Atlantique et la Méditerranée ont toujours donné lieu à de nombreuses discussions au sujet de leurs affinités réciproques. A l'époque encore récente où le nombre des espèces connues des côtes de France était encore très réduit, la place dans tel ou tel genre d'espèces telles que Helicolenus (Sebastes) dactylopterus DELAROCHE ou Scorpaena maderensis Cuvier et Valenciennes, par exemple, ont provoqué des séries d'articles où les conclusions des auteurs successifs n'étaient pas toujours concordantes, et aujourd'hui encore la lumière est loin d'être faite sur bien des points. Les difficultés que l'on rencontre dans la détermination des Scorpénidés : grande ressemblance générale, différences parfois difficiles à saisir, impossibilité de comparer les échantillons d'étude aux types, obligation de se contenter de descriptions incomplètes .ou mal interprétées, ont trop souvent entraîné les chercheurs à des déterminations trop hâtives ayant comme résultats : de compliquer la synonymie et de fausser plus ou moins complètement les données acquises sur la biogéographie d'une espèce. C'est ainsi que la Scorpène appelée Scorpaena rubellio par JORDAN et GUNN (Il est considérée comme synonyme de S. maderensis Cuvier Valenciennes par J. R. NORMAN (2), et de S. porcus Linné par H. W. FOWLER (3). De même l'extension de l'aire de dispersion de S. scrofa en Guinée, au Niger et à Sainte-Hélène, est due à des confusions avec des espèces différentes telles que S. stephanica, S. angolensis et S. scrofina. (OCR non contrôlé)
Revue des Travaux de l'Institut des Pêches Maritimes (0035-2276) (ISTPM), 1943 , Vol. 13 , N. 1-4

Droits : Ifremer
http://archimer.ifremer.fr/doc/1943/publication-3420.pdf
http://archimer.ifremer.fr/doc/00000/3420/

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The lower Pleistocene Kritika Member of the Rhodes Formation is composed of predominantly siliciclastic deposits that are sometimes intercalated with hardbottoms formed by drowning of former beachrock beds. A wide variety of sclerobionts occur in this environment, very different from the poorest soft‐bottom populations occurring in other levels of the Kritika Member. The most characteristic, abundant and frequently diverse are the encrusting forms: coralline algae, bivalves, serpulid worms, and bryozoans. Numerous other groups of sessile and vagile organisms are associated with these crust‐forming communities. A number of skeletal organisms (sometimes including zooxanthellate coral colonies) formed small carbonate buildups on top of several beachrock beds. Boring organisms also occur. Evidence for a two‐step deepening succession over the previously formed beachrock is provided by palaeontological and sedimentological data. The rapidly cemented sandy‐conglomeratic beds were first colonised by a relatively shallow‐water (around 20 m) biocoenosis of mostly encrusting organisms. Another association, with encrusting and erect organisms, was later established in a deeper environment (20-40 m). A comparison with Holocene beachrock occurring on the coast of Rhodes was also undertaken. Their submerged part provided habitat for poorer but similar biotas to those occurring in the Kritika Member. The lower Pleistocene beachrock and associated organogenic fossil assemblages indicate repeated drowning episodes during deposition of the Kritika Member and provide help in sequence stratigraphic interpretations of these siliciclastic deposits. Notably, they can be used as indicators of relative sea‐level changes.
ISSN: 0031-0182

hal-00795591
https://hal.archives-ouvertes.fr/hal-00795591
DOI : 10.1016/j.palaeo.2012.09.007