ESKERS - AN ESSAY OF BIBLIOGRAPHIC REVIEW

Eskers: an essay of bibliographic review. This essay deals with the li terature on eskers. Basic informations (definition, terminology, dimen sions, distribution and general sedimentologic features, including gra nulometry, fabrics, paleocurrents, deformations and lithologic composi tion) are presented, then theories on the origin of these forms (subgl acial hypothesis, superglacial and englacial hypothesis, marginal hypo thesis and others) are exposed. Moreover, the different depositional m odels of eskers (open channel, full-pipe flow, deltaic) and some other concepts on their formation (meltwater flow, subglacial tunnel stabil ity in ice, sediment sources, diachronism of constructions and length of tunnels) are examined. Finally, the development of eskers in curren t glacial environments are considered.