Straight-to-sinuous ridge composed of sand/gravel, deposited in a confined glacial meltwater drainage channel.
Winding, steep sided, narrow, sharp- to broad-crested ridges of cross-stratified and massive sand, gravel, and boulders. May be mistaken for other slightly sinuous or Linear ridge types (various origins). In planform, eskers can be sinuous, anastomosing, and/or discontinuous. Isolated, closed depressions (kettles), commonly water filled, may flank or be part of broader esker ridges.
Eskers may occur in isolation or form networks that branch upflow in either subparallel or dendritic patterns (Brennand 2000) with up to fourth-order tributaries (Shilts et al. 1987). Esker systems may be composed of (in increasing order of scale) anastomosing eskers, short sub-parallel esker systems,...
KeywordsFroude Number Sedimentary Facies Open Channel Flow Glacial Meltwater Hyperconcentrated Flow
- Banerjee I, McDonald BC (1975) Nature of esker sedimentation. In: Jopling AV, McDonald BC (eds) Glaciofluvial and glaciolacustrine sedimentation, Society of Economic Palaeontologists and Mineralogists. Special publication 23. Society of Economic Palaeontologists and Mineralogists, Tulsa, pp 304–320Google Scholar
- Banks ME, Lang NP, Kargel JS, McEwen AS, Baker VR, Grant JA, Pelletier JD, Strom RG (2009) An analysis of sinuous ridges in the southern Argyre Planitia, Mars using HiRISE and CTX images and MOLA data. J Geophys Res 114(E9), CiteID E09003Google Scholar
- Coleman N (2011) Phaenna Dorsum, an esker on Mars: insights from THEMIS and HiRISEe images and MOLE data. Lunar Planet Sci Conf, abstract #1906, HoustonGoogle Scholar
- Craig BG (1964) Surficial geology of east-central District of Mackenzie, Northwest Territories. Geological Survey of Canada, Bulletin 99. Department of mines and technical surveys, Ottawa, Canada. http://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/downloade.web&search1=R=100618
- Head JW (2000) Tests for ancient polar deposits on Mars: origin of esker-like sinuous ridges (Dorsa Argentea) using MOLA data. 31th Lunar Planet Sci, abstract #1116, HoustonGoogle Scholar
- Hummel D (1874) Om rullstenbildningar. K. Svenska Vetenskaps-Akademiens Förhandlingar, Bihang til 2(11), 36 pGoogle Scholar
- Kargel JS, Strom RG (1991) Terrestrial glacial eskers: analogs for martian sinuous ridges. Lunar Planet Sci Conf XXII:683–684, HoustonGoogle Scholar
- Röthlisberger H (1972) Water pressure in intra- and subglacial channels. J Glaciol 11:177–203Google Scholar
- Shilts WW, Aylsworth JM, Kaszycki CA, Klassen RA (1987) Canadian shield. In: Graf WL (ed) Geomorphic systems of North America, Centennial special 2. Geological Society of America, Boulder, Colorado, pp 119–161Google Scholar
- Stone GH (1899) The glacial gravels of Maine. U.S. Geological Survey?, Washington. http://pubs.er.usgs.gov/publication/m34