Antarctica ; Earth surface processes ; Esker ; Glacial features ; Glacier margin ; Ice sheets;Ice cap;Inlandsis ; Moraines
The eskers described in this paper have formed on the surface of cold ice at the margin of the Antarctic ice sheet. The location, orientation, sedimentary properties and field relationships of the eskers are described and a model of their formation
The ancient shorelines of the Jarlasa esker, province of Uppland, Southern Sweden
Esker ; Glaciaire ; Ligne de rivage ; Niveau marin ; Paléogéographie ; Stratigraphie ; Suède
Esker ; Glacial features ; Paleogeography ; Sea level ; Shorelines ; Stratigraphy ; Sweden
The ancient shoremarks of the Järlåsa esker have been levelled. A stratification attempt has been made. This identifies a number of strata in the altitude interval between c. 60 and 70 m a.s.l. This result is in good agreement with studies from
the Heby esker, situated at c. 20 km w of the Järlåsa esker.
Late Wisconsin ice-surface profile calculated from esker paths and types, Katahdin esker system, Maine
Etats-Unis ; Glaciologie ; Géographie physique ; Katahdin esker system ; Maine ; Modèle ; Méthodologie ; New England ; Paléoglaciologie ; Pléistocène supérieur ; Profil longitudinal de la glace ; Quaternaire zones moyennes ; Reconstruction
Values of the gradient of the former ice surface can be inferred at points along a flow line from deviations of esker paths or transitions in esker type and numerically integrated to give the profile. The method is applied to the Katahdin esker
Esker ; Finlande ; Glaciaire ; Géographie physique ; Ile ; Isostasie ; Littoral ; Modelé glaciaire ; Zone froide
A partially submerged esker situated among a group of rocky islands on the northern coast of the Gulf of Finland is examined. As the esker emerged from the sea to form separate islands, the glaciofluvial material was deformed by current and wave
action and redeposited. The contemporary rate of emergence is 1.8 mm per year. The structural differences in the primary esker have been emphasized by selective marine erosion. Wave action has resulted in the formation of beach ridges on the southernmost
tip of the esker. Elsewhere this same action causes longshore drifting, which has resulted in the development of spits and tombolos on the lee side of the esker islands.
Deglacial meltwater drainage and glaciodynamics : inferences from Laurentide eskers, Canada
Canada ; Distribution spatiale ; Drainage ; Eau de fonte ; Esker ; Fluvioglaciaire ; Glaciaire ; Hydrologie ; Ontario ; Quaternaire ; Typologie
Canada ; Drainage ; Esker ; Fluvioglacial features ; Glacial features ; Hydrology ; Meltwater ; Ontario ; Quaternary ; Spatial distribution ; Typology
This paper evaluates current knowledge of Laurentide eskers in Canada in the light of developments in glacier hydrology and glacial sedimentology. Questions regarding the morpho-sedimentary relations of eskers, the synchroneity and operation of R
-channel systems, the role of supraglacial meltwater input and proglacial water bodies, the controls on esker pattern, and the glaciodynamic condition of the ice sheet at the time of esker formation are discussed. A morphologic classification of eskers
is proposed. 5 types of eskers are identified and investigated and their spatial distribution is discussed.
Esker ; Fluvioglaciaire ; Glaciaire ; Réseau de drainage ; Sismique ; Suède ; Topographie ; Zone froide
Cold area ; Drainage network ; Esker ; Fluvioglacial features ; Glacial features ; Seismic method ; Sweden ; Topography
Eskers sometimes become much wider and higher for short sections. Such sections are called esker enlargements in this paper. Comparative studies of these phenomena have been carried out in inland areas of northern Sweden above the highest shoreline
Relations between topography, microclimates and vegetation on the Kalmari-Saarijärvi esker chain, Central Finland
Climat ; Dynamique des populations ; Ecosystème ; Esker ; Finlande ; Finlande du Centre ; Géographie de l'Europe ; Humidité du sol ; Microclimat ; Température ; Topographie ; Végétation
The principal aim was to acquire more specific information on the effects of surficial landforms on the microclimate of an esker area and the effects of this microclimate on the esker vegetation in this part of Central Finland. Attention was also
paid to the significance of the vegetation in regulating the microclimate. The majority of the fieldwork, surveying and measurements were carried out in summer 1986. The esker chain was divided into five parts, each with characteristic surficial
The influence of clear felling on temperature and vegetation in an esker area at Lammi, Southern Finland
Action anthropique ; Climat ; Esker ; Finlande ; Microclimat ; Température ; Végétation ; Zone froide
Climate ; Cold areas ; Esker ; Finland ; Human impact ; Microclimate ; Temperature ; Vegetation
Etude des caractéristiques du microclimat de l'esker de Lammi, Finlande du sud, et en particulier des conséquences d'une coupe à blanc sur les variations de température et la dégradation des arbres et des plantes.―(CL)
Shorelines of the Uppsala esker east-central Sweden : their use as indicators of regional differences in shore displacement
Esker ; Fluvioglaciaire ; Ligne de rivage ; Mouvement vertical ; Niveau marin ; Paléogéographie ; Statistique ; Suède
Esker ; Fluvioglacial features ; Palaeogeography ; Sea level ; Shoreline ; Statistics ; Sweden ; Vertical movement
About 750 different shoremarks, mainly shore terraces, have been levelled along the Uppsala esker. Using various methods it has been possible to arrange the shoremarks to shorelines. It was found that the shorelines on the whole were sloping towards
Basing on the detailed geomorphological mapping and analyses of exposures, the authors present structure of the esker rampart situated on the crest of drumlins, which were described in former publications as esker arms. The collected material
Le profil longitudinal de la vallée Verendrye de forme concave vers le haut, les relations entre les origines de la vallée Verendrye et de l'esker Glidden, et les datations révèlent que la vallée et l'esker furent formés par un cours d'eau sous
-glaciaire durant la dernière déglaciation, il y a 15500-14000 ans. La séquence de sédiments plus fins vers le toit dans la vallée et l'esker indiquent que la vallée sous-glaciaire s'est formée par une érosion en amont, tandis qu'au niveau de l'esker la marge
Alaska ; Amérique du Nord ; Bibliographie ; Esker ; Europe ; Fluvioglaciaire ; Glaciaire ; Granulométrie ; Géomorphologie ; Marge glaciaire ; Pétrographie ; Quaternaire
Alaska ; Bibliography ; Esker ; Europe ; Fluvioglacial features ; Geomorphology ; Glacial features ; Glacier margin ; Grain size distribution ; North America ; Petrography ; Quaternary
Revue de la littérature sur les eskers. Présentation des informations de base (définition, terminologie, dimensions, distribution et caractères sédimentologiques généraux,incluant granulométrie, fabriques, paéocourants, déformations et composition
pétrographique) et un historique des théories sur l'origine de ces constructions (hypothèses sous-gaciaire, supra- et intraglaciaire, de marge glaciaire). En outre, étude des différents modèles de sédimentation des eskers et discussion du développement des eskers
Sedimentological and GPR studies of subglacial deposits in the Joux Valley (Vaud, Switzerland) : backset accretion in an esker followed by an erosive jökulhlaup
l'érosion, la sédimentation sous-glaciaire avait lieu dans des conduits fermés (eskers) avec de fortes et rapides variations de courant. Les AA. interprètent ces drumlins gravelo-sableux comme des portions d'eskers ayant acquis leur forme actuelle à la suite
Diatom ; Esker ; Finland ; Fluvioglacial features ; Glacial features ; Glaciation ; Organic materials ; Palynology ; Pollen diagram ; Quaternary ; Stratigraphy
The aim of this paper is to demonstrate the sedimentology of the Harrinkangas formation and the origin of the enclosed organic remains. This esker contains peat layers and is covered by thin silty till. The AA. argue that it is possible to explain
Drumlin ; England ; Esker ; Glacial erosion ; Glacial tectonics ; Glaciation ; Glacier ; Ice sheet ; Ireland ; Moraine ; United Kingdom
. Changes in subglacial hydrology are also discussed, and the relationship of eskers and tunnel valleys to deforming bed conditions. Sedimentary techniques to identify homogeneous deforming bed tills in the field are also suggested. Finally the extent
Canada ; Drainage ; Eau de fonte ; Esker ; Fluvioglaciaire ; Glaciaire ; Northwest Territories ; Paléogéographie ; Victoria Island
Canada ; Drainage ; Esker ; Fluvioglacial features ; Glacial features ; Meltwater ; Northwest Territories ; Palaeogeography ; Victoria Island
The aim of this paper is to describe and interpret glaciofluvial complexes at three sites on Victoria Island and to use these to assess the formative melt-water conditions. Differences in esker morphology and sedimentology and landform associations
Esker ; Evolución del relieve ; Fluctuación climática ; Fluctuación del glaciar ; Geomorfología ; Helero ; Morrena ; Paleogeomorfología ; Terminología
Analyse de la genèse des formes de reliefs suivantes : des moraines de poussée, des rangées de fissures d’extrusion, des eskers en zigzag, des hummocks morainiques etc. L’A. évalue la possibilité d’utiliser ces formes en tant qu’indicateur de