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Geociencias. Medio ambiente

Mostrando recursos 1 - 20 de 17.609

  1. I. — Contribution à la connaissance du Paléolithique moyen en Haute-Garonne ; le gisement de Mauran

    Giraud, Catherine; Hoffert, Michel; Miskovsky, Jean Claude
    The middle-Paleolithic dwelling place of Mauran, situated in a ten meters high quaternary open-air deposit, has recently been excavated. Preliminary stratigraphical and sedimentological analysis reveal several different climatic phases wich can be referred either to middle quaternary or to beginning of Würm. The prehistoric level, has given numerous bovidae bones associated with a Mousterian-like industry manufactured on quartzite pebbles and flint.

  2. L'évolution des nappes alluviales antérissiennes de la Garonne, dans l'avant-pays molassique

    Hubschman, Jacques
    Description and analysis of the Garonne pre-Riss deposits. Mindel alluvial pebble weathering is shown by : strong weathering of crystalline material ; clay formation and argillic development ; genesis of kaolinic minerals but very disorderly ; water-tighting of pebble alluvions . . . Gunz materials are little more weathered but Donau alluvions are extremly weathered, with important amounts of well crystallized kaolinic minerals. Iron-crust genesis and origin of silt cover are discussed.

  3. II.— Les terrasses récentes de la Garonne et leur évolution

    Hubschman, Jacques
    Description of quaternary alluvial system of the Garonne. The low plain deposits, with brown-leached profiles, are Würm old. The low terrace, with hydromorphic leached soils in silt and already weathered deep horizons in alluvial pebbles, dates from the Riss period.

  4. I. — Modelés et formations quaternaires du terrefort molassique, au Sud de Toulouse

    Hubschman, Jacques
    In the hills of the molassic region, high surfaces surround recent colluvium covered slopes and little loess deposits in hollows. Soil profiles of hight surfaces are relatively young : hight surfaces have been recently shapened (Würm I ? ). One big loess profile is described and analyzed (second part of Würm).

  5. Barral L., Simone S. « Eléments d'analyse des données. Choix des variables et modèles en archéologie préhistorique.» Bull. Mus. Anth. Préhist. Monaco 21, p. 1-114. 1977.

    Chaline, Jean

  6. J.L. de Beaulieu. Contribution pollenalytique à l'histoire tardiglaciaire et holocène de la végétation des Alpes méridionales françaises.

    Chaline, Jean

  7. Cécile Mourer-Chauviré. «Les oiseaux du Pleistocène moyen et supérieur de France». Documents des Laboratoires de Géologie de la Faculté des Sciences de Lyon. n°, 64, 2 fasc, 624 p

    Chaline, Jean

  8. Traces de stationnement de la mer au Quaternaire récent sur le littoral des Mogods (Tunisie septentrionale)

    Miossec, Alain
    This paper describes two coastal sections in the Mogods, Northern Tunisia, including marine deposits which might belong to the Würm 1 - Würm 2 interstade. More research is needed.

  9. Evolution de deux lagunes du Roussillon depuis le maximum marin holocène

    Martin, R.
    Along the Roussillon coast (South of France, Mediterranean sea), two lagoons stretch, the Canet — Saint-Nazaire one and the Salses - Leucate one. The sedimentary filling depends on the last events of the eustatic sea level rise. The paleomorphological environments are different in both areas but they determine largely their evolution : input of coarse material at Salses-Leucate lagoon, deposits of sheltered areas at Canet — Saint-Nazaire lagoon. It is shown that more than one sedimentary unit are contemporaneous with the present sea level.

  10. Relations entre le niveau marin, les dépôts sédimentaires et la construction des digues dans la plaine maritime picarde

    Lefèvre, Pascal; Regrain, R.
    Comparaison of soils profiles gives a general view of the sedimentation in the Picardy Coastal Plain. The construction of sea-walls can be connected with the sea-level variations and with the population history (peace, wars, increase in population).

  11. Les niveaux marins du Montenegro (Yougoslavie)

    Gachelin, C.
    The whole yugoslav coast-line is known as a submerged coast. However, in Montenegro, notches and sea-deposits can be observed at about + 3,50 m and + 5 m above present sea-level near Budva and at the south of Bar (Pijesak-Sintin). The sea level of Pijesak- Sintin has been dated by roman potteries. These sea levels are very recent and are to be related to neotectonic uplifts and seismic activity.

  12. Mise en évidence de dépôts à caractère fluvio-marin parmi les nappes alluviales de la Basse Somme

    Dupuis, C.; Haesaerts, P.; De Heinzelin, J.
    One of the gravel sheets of the alluvial complex of the "Basse Somme" shows some characteristics which are considered as witness of a marine influence. This gravel sheet, named Croix l'Abbé Formation was deposited about a height of 25 m during a cold climatic episode of the Lower Pleistocene ; relationships with the terraces of the Somme between Pinchefalise and Saigneville are discussed here. One of the writters (De H.) describes the associated Palaeolithic artefacts.

  13. Succession et âges radiométriques des terrasses marines du levant espagnol

    Dumas, Bernard

  14. Témoins de lignes de rivage holocènes en Turquie méridionale

    Dalongeville, Rémi; Sanlaville, Paul
    Along the Southern coast of Turkey are numerous traces of Holocene shorelines above present sea level. In the carbonaceous rocks, the modern corrosion platform is sometimes accompanied by a fossil platform. Generally, there is a fossil beach which is connected, below the present beach, with beachrock. The fossil corrosion platform and the fossil beachrock cannot be contemporaneous. They look like the shore forms we studied along the Lebanosyrian coast. The interpretations must be considered on a regional scale.

  15. Les niveaux marins postglaciaires de l'Islande

    Bodéré, J.
    In Iceland, late- and post-glacial marine sea-levels, well visible at 40 m high, have been dated at 12 300 - 9 600 B.P. Geomorphological evidence shows that emersion was particularly rapid during the final phase, on the contrary to what has been observed in other isostatically uplifted areas in the world. Between 9 000 and 3 000 B.P., the sea-level seems to have stood at 2 - 4 m below present level, and a small transgression would have occurred during the historical period.

  16. Ensembles sédimentaires et formes d'érosion du Quaternaire sous-marin de la Manche orientale

    Auffret, Jean; Alduc, D.
    From a general picture of alluvial filling and bed-rock geomorphology recognized by seismic reflection in the eastern part of the English Channel, a discussion is made possible on the effects of sea-leval changes in that area during the Quaternary..

  17. C. Problèmes paléogéophysiques et paléogéographiques posés par les niveaux marins quaternaires

    Faure, Hugues
    The variations of shorelines depend on a large number of factors. The significance of features as peat bogs is complex. The geoid can give different responses to the water load from the melting of Pleistocene ice, so that different Holocene sea-levels can exist at the same time.

  18. B. Considérations sur les niveaux marins quaternaires

    Guilcher, André
    This paper is a series of comments on topics discussed in the Symposium on Quaternary sea-levels held in Saint-Valéry sur Somme, 1-3 December, 1977. The topics reviewed are : 1. Frequent occurrence of shorelines lying at the same altitudes although their ages are different. - 2. Does the Eemian transgression include several oscillations ? - 3. Has present sea-level been reached at 35 000 B p ? - 4. Tectonic influences on Quaternary shorelines. - 5. Impact of climate. - 6. Significance of scattered small notches above present platforms. 7. - Submarine environments. - 8. Peculiarities in Holocene coastal deposition.

  19. Données floristiques et paléoclimatologiques du Pléistocene supérieur dans le Chablais (Haute-Savoie). Résultats synthétiques et chronostratigraphie

    BRUN, Annick
    A palynological and stratigraphical study has been performed on glacial, interglacial, and interstadial deposits outcropping in the Dranse river valley and which have been reached by two drill holes (« Sionnex » and « Royal) near Evian. Ages of these different deposits and their stratigraphical correlations from paleobotanical data and from C 14 datations are discussed. The complete stratigraphical series is believed to include the Riss-Würm, the Mesowuürm and the Neowürm.

  20. Littoraux et vallées holocènes submergés en Baie de Concarneau (Bretagne méridionale)

    Delanoë, Yann; Pinot, Jean Pierre
    Lors de la régression pré-flandrienne, la Baie de Concarneau était parcourue par des rivières qui gagnaient le large par le Sud-Est. Lors de la transgression holocène, la mer pénétra par là dans la dépression prélittorale et construisit, notamment à 47, 37 et 27 m plus bas que les formes homologues actuelles, des accumulations pro-estuariennes et des littoraux. Les rapports entre ces formes, les terrasses alluviales, et les incisions fluviales permettent de proposer des correspondances entre les types de régimes fluviaux et les stationnements successifs du niveau de la mer. Lors du stationnement marin vers 37 m sous l'actuel, des nappes...

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