Knowledge (XXG)

Esker

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The path of an esker is governed by its water pressure in relation to the overlying ice. Generally, the pressure of the ice was at such a point that it would allow eskers to run in the direction of glacial flow, but force them into the lowest possible points such as valleys or river beds, which may
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eskers. They are not often found as continuous ridges, but have gaps that separate the winding segments. The ridge crests of eskers are not usually level for very long, and are generally knobby. Eskers may be broad-crested or sharp-crested with steep sides. They can reach hundreds of kilometers in
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in an esker. The sediment generally consists of coarse-grained, water-laid sand and gravel, although gravelly loam may be found where the rock debris is rich in clay. This sediment is stratified and sorted, and usually consists of pebble/cobble-sized material with occasional boulders.
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Plastic flow and melting of the basal ice determines the size and shape of the subglacial tunnel. This in turn determines the shape, composition and structure of an esker. Eskers may exist as a single channel, or may be part of a branching system with
175:), which means "ridge or elevation, especially one separating two plains or depressed surfaces". The Irish word was and is used particularly to describe long sinuous ridges, which are now known to be deposits of 237:, in linear zones between stagnant blocks, or in narrow embayments at glacier margins. Eskers form near the terminal zone of glaciers, where the ice is not moving as fast and is relatively thin. 262:
deviate from the direct path of the glacier. This process is what produces the wide eskers upon which roads and highways can be built. Less pressure, occurring in areas closer to the
293:. These dunes are often found in the leeward side of eskers, if the esker is not oriented parallel to prevailing winds. Examples of dunes developed on eskers can be found in both 1751: 793: 427:
in southeast Scotland is Bedshiel Kaims, a 3 km-long (1.9 mi) example which is up to 15 m (49 ft) high and is a legacy of an ice-stream within the
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The concentration of rock debris in the ice and the rate at which sediment is delivered to the tunnel by melting and from upstream transport determines the amount of
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esker bisects the eponymous lake and extends discontinuously for 85 miles (c. 137 km). Another long discontinuous esker extends from Mountain Pond through
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National Natural Landmark, Washington, US. (Trees at the edge of the esker and the single lane road crossing the esker to the right of the photo provide scale.)
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Most eskers are argued to have formed within ice-walled tunnels by streams that flowed within and under glaciers. They tended to form around the time of the
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and formerly glaciated regions of Europe and North America. Eskers are frequently several kilometres long and, because of their uniform shape, look like
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Lakes may form within depressions in eskers. These lakes can lack surface outflows and inflows and have drastic fluctuations over time.
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Shreve, R.L., 1985, Esker characteristics in terms of glacier physics, Katahdin esker system, Maine: GSA Bulletin, v. 96, pp. 639–646.
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Thelon Esker is almost 800 km (500 mi) long, straddling the boundary between the territories of
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Eskers are critical to the ecology of Northern Canada. Several plants that grow on eskers, including
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Diagram illustrating (i) tunnel in glacier before retreat of ice, forming (ii) meandering esker in
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in Aberdeenshire, Scotland has a 5 km (3.1 mi) esker locally called the Kemb Hills. In
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Esker systems in the U.S. state of Maine can be traced for up to 160 km (100 mi).
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Long, winding ridge of stratified sand and gravel associated with former glaciers
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and the Spectacle Ponds, and continuing to Ochre, Fish, and Lydia Ponds in the
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Roads are sometimes built along eskers to save expense. Examples include the
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Eskers may also form above glaciers by accumulation of sediment in
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length and are generally 20–30 m (66–98 ft) in height.
2575: 1962: 1661: 1430: 1237: 598: 324: 111: 2429: 1733: 1095: 868:(Fourth ed.). British Geological Survey. pp. 191–92. 636:"McGraw-Hill Dictionary of Scientific & Technical Terms" 1091: 376:
stretches for 250 km (160 mi) and passes through
824:(in Swedish). Sundbyberg: Svensk Byggtjänst. p. 196. 1039:. Don Mills, Ontario: Oxford University Press. pp.  339:
can burrow into the eskers to survive the long winters.
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The Bridgenorth Esker: geomorphology and sedimentology
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Oblique aerial photo of an esker in Waterford, Maine
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You Bet!" 765:Wind as a Geomorphic Agent in Cold Climates 583: â€“ Provincial park in British Columbia 162: 2448: 2434: 2426: 2012: 1937: 1845: 1752: 1738: 1730: 1445: 1114: 1100: 1092: 755: 753: 751: 725:. New Jersey: Prentice Hall. p. 352. 1082:Bureau of Topographic and Geologic Survey 946:. Maine Geological Survey. 6 October 2005 607: â€“ Glacial-formed geographic feature 845:National Geographic Almanac of Geography 38: 616: 189:, which runs nearly the whole width of 2126:Ice Age Floods National Geologic Trail 2090:Chippewa Moraine State Recreation Area 543:There are numerous long eskers in the 327:and migrating waterfowl; animals from 1036:Geomorphology: A Canadian Perspective 940:"Surficial Geologic History of Maine" 7: 567:. A 150-foot-high esker bisects the 289:have developed next to eskers after 2132:Ice Age National Scientific Reserve 662:"Eskers: The Upside-Down Riverbeds" 449:There are over 1,000 eskers in the 25: 2120:Horicon Marsh State Wildlife Area 666:Alaska Science Forum Article #674 595: â€“ Geomorphology of glaciers 457:, primarily in the south-central 2410: 2409: 2065:Origin of the Oak Ridges Moraine 1719:Template:Periglacial environment 693:Dictionary of the Irish Language 660:Gedney, Larry (August 1, 1984). 723:Surface Processes and Landforms 691:Quin, E. G. (gen. ed.) (1983). 528:, and the "Airline" segment of 2128:, Idaho, Oregon and Washington 807:10.1080/04353676.1972.11879860 285:There are various cases where 1: 2372:Huelmo–Mascardi Cold Reversal 442:runs along the Back River in 118:, examples of which occur in 1793:Glacial history of Minnesota 973:. Random House. p. 56. 246:Sims Corner Eskers and Kames 208:comes from the Swedish word 2156:Kettle Moraine State Forest 2059:Lion's Head Provincial Park 55:Esker used as a hiking path 2613: 2476:Coastal sediment transport 2302:Penultimate Glacial Period 2029:Big Rock (glacial erratic) 721:Easterbrook, D.J. (1999). 624:Collins English Dictionary 569:Five Ponds Wilderness Area 29: 2405: 2367:Late Glacial Interstadial 2146:, Minnesota and Wisconsin 2023:Arrowhead Provincial Park 1798:List of prehistoric lakes 1699: 1077:The Ice Melts: Deposition 351:A part of the Mason Esker 323:, are important food for 2322:Holocene glacial retreat 2114:Glacial Lakes State Park 2053:Foothills Erratics Train 1033:Trenhaile, Alan (2007). 965:Gray, Charlotte (2004). 763:(2004). "Accumulation". 505:, the Kitikmeot Region, 2362:Bølling–Allerød warming 2102:Devil's Lake State Park 2071:Ovayok Territorial Park 1760:Continental glaciations 503:Ovayok Territorial Park 444:Weymouth, Massachusetts 172: 2204:Yosemite National Park 2108:Glacial Lake Wisconsin 2047:Eskers Provincial Park 2035:Cypress Hills (Canada) 1833:Timeline of glaciation 581:Eskers Provincial Park 360: 352: 249: 210: 163: 150: 91:, sometimes called an 72: 56: 48: 32:Esker (disambiguation) 2347:Quaternary glaciation 2282:Quaternary glaciation 2180:Mill Bluff State Park 2144:Interstate State Park 1958:Giant current ripples 1773:Cordilleran ice sheet 1657:Giant current ripples 944:Explore Maine Geology 820:Källakademin (2006). 545:Adirondack State Park 489:Northwest Territories 473:, before ending near 359:Mount Pelly or Ovayok 358: 350: 243: 231:supraglacial channels 140: 103:, is a long, winding 62: 54: 42: 2357:Wisconsin glaciation 2312:Last Glacial Maximum 1828:Post-glacial rebound 1783:Last Glacial Maximum 1778:Laurentide ice sheet 565:St. Regis Canoe Area 561:Upper St. Regis Lake 408:. A similar site is 157:is derived from the 149:are built on eskers. 30:For other uses, see 2342:Pre-Illinoian Stage 2307:Last Glacial Period 2096:Coteau des Prairies 2007:Greenland ice sheet 1594:Moraine-dammed lake 1421:Subglacial eruption 1070:Esker Riada Webpage 1010:Adirondack Almanack 530:Maine State Route 9 501:or Mount Pelly, in 2457:Sediment transport 2387:4.2 kiloyear event 2382:8.2 kiloyear event 2317:Mousterian Pluvial 2049:, British Columbia 1426:Subglacial volcano 1409:Volcanic relations 864:Stone, P. (2012). 593:Glacier morphology 559:, passing between 361: 353: 343:Examples of eskers 250: 151: 73: 57: 49: 2584: 2583: 2496:Bed material load 2481:Fluvial processes 2423: 2422: 2392:Piora Oscillation 2352:Sangamonian Stage 2213: 2212: 1995: 1994: 1991: 1990: 1727: 1726: 1695: 1694: 1213:Accumulation zone 1050:978-0-19-542474-4 1012:. 7 November 2009 16:(Redirected from 2604: 2471:Armored mud ball 2450: 2443: 2436: 2427: 2413: 2412: 2013: 1938: 1922:Terminal moraine 1846: 1754: 1747: 1740: 1731: 1614:Terminal moraine 1446: 1182:Piedmont glacier 1116: 1109: 1102: 1093: 1054: 1021: 1020: 1018: 1017: 1002: 996: 994:Down East Region 991: 985: 984: 972: 962: 956: 955: 953: 951: 936: 930: 929: 927: 926: 917:. Archived from 911: 905: 904: 902: 901: 886: 880: 879: 875:978-085272-694-5 861: 855: 847:, 2005, p. 155, 842: 836: 835: 822:Källor i Sverige 817: 811: 810: 785: 779: 778: 757: 746: 743: 737: 736: 718: 707: 706: 688: 682: 681: 679: 677: 668:. Archived from 657: 651: 650: 648: 647: 638:. Archived from 632: 626: 621: 587:Glacial landform 522:Trans-Taiga Road 440:Great Esker Park 414:Finnish Lakeland 337:ground squirrels 213: 166: 141:Portions of the 47:, western Sweden 21: 2612: 2611: 2607: 2606: 2605: 2603: 2602: 2601: 2587: 2586: 2585: 2580: 2562: 2541: 2517:Glacial outwash 2500: 2459: 2454: 2424: 2419: 2401: 2287:Illinoian Stage 2270: 2261:Lambert Glacier 2244: 2230:Killary Harbour 2209: 2162:Lake Bonneville 2082: 2076: 2011: 1987: 1936: 1885: 1881:U-shaped valley 1871:Roche moutonnĂ©e 1837: 1803:Proglacial lake 1788:Canadian Shield 1761: 1758: 1728: 1723: 1691: 1628: 1609:Sevetti moraine 1567: 1521:Roche moutonnĂ©e 1466:Cirque stairway 1435: 1404: 1383: 1307: 1268:Lateral moraine 1196: 1125: 1120: 1061: 1051: 1032: 1029: 1027:Further reading 1024: 1015: 1013: 1004: 1003: 999: 992: 988: 981: 964: 963: 959: 949: 947: 938: 937: 933: 924: 922: 913: 912: 908: 899: 897: 888: 887: 883: 876: 863: 862: 858: 843: 839: 832: 819: 818: 814: 787: 786: 782: 775: 759: 758: 749: 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and tail 1469: 1467: 1464: 1462: 1459: 1457: 1454: 1453: 1451: 1447: 1444: 1442: 1438: 1432: 1429: 1427: 1424: 1422: 1419: 1417: 1414: 1413: 1411: 1407: 1401: 1398: 1396: 1393: 1392: 1390: 1386: 1380: 1377: 1375: 1372: 1370: 1367: 1365: 1362: 1360: 1357: 1355: 1354:Overdeepening 1352: 1350: 1347: 1345: 1342: 1340: 1337: 1335: 1332: 1330: 1329:Basal sliding 1327: 1325: 1322: 1320: 1317: 1316: 1314: 1310: 1304: 1301: 1299: 1296: 1294: 1291: 1289: 1286: 1284: 1281: 1279: 1276: 1274: 1271: 1269: 1266: 1264: 1261: 1259: 1256: 1254: 1251: 1249: 1246: 1244: 1241: 1239: 1236: 1234: 1231: 1229: 1226: 1224: 1221: 1219: 1216: 1214: 1211: 1209: 1208:Ablation zone 1206: 1205: 1203: 1199: 1193: 1190: 1188: 1185: 1183: 1180: 1178: 1175: 1173: 1170: 1168: 1165: 1163: 1160: 1158: 1155: 1153: 1150: 1148: 1145: 1143: 1140: 1138: 1135: 1134: 1132: 1128: 1124: 1117: 1112: 1110: 1105: 1103: 1098: 1097: 1094: 1088: 1085: 1083: 1079: 1078: 1073: 1071: 1068: 1066: 1063: 1062: 1058: 1052: 1046: 1042: 1038: 1037: 1031: 1030: 1026: 1011: 1007: 1001: 998: 995: 990: 987: 982: 980:0-679-31220-X 976: 971: 970: 961: 958: 945: 941: 935: 932: 921:on 2013-12-03 920: 916: 910: 907: 895: 891: 885: 882: 877: 871: 867: 860: 857: 854: 853:0-7922-3877-X 850: 846: 841: 838: 833: 831:91-7333-104-X 827: 823: 816: 813: 808: 804: 801:(2): 85–104. 800: 796: 795: 790: 784: 781: 776: 774:9780521564069 770: 766: 762: 756: 754: 752: 748: 742: 739: 734: 732:0-13-860958-6 728: 724: 717: 715: 713: 709: 704: 702:0-901714-29-1 698: 694: 687: 684: 671: 667: 663: 656: 653: 642:on 2015-04-20 641: 637: 631: 628: 625: 620: 617: 611: 606: 605:Tunnel valley 603: 600: 597: 594: 591: 588: 585: 582: 579: 578: 574: 572: 570: 566: 562: 558: 554: 550: 546: 541: 539: 535: 531: 527: 523: 519: 515: 510: 509:is an esker. 508: 504: 500: 496: 494: 490: 486: 481: 478: 476: 472: 468: 464: 460: 456: 452: 447: 445: 441: 435:North America 434: 432: 430: 426: 422: 417: 415: 411: 407: 403: 399: 395: 391: 387: 383: 382:BadelundaĂĄsen 379: 375: 371: 363: 357: 349: 342: 340: 338: 334: 333:tundra wolves 330: 329:grizzly bears 326: 322: 318: 310: 308: 305: 303: 300: 296: 292: 288: 283: 281: 280:cross-bedding 277: 272: 267: 265: 259: 256: 247: 242: 238: 236: 232: 227: 225: 217: 215: 212: 207: 202: 200: 196: 192: 188: 187: 182: 178: 174: 170: 165: 160: 156: 148: 144: 139: 132: 130: 128: 125: 121: 117: 113: 110: 106: 102: 98: 94: 90: 86: 82: 78: 70: 66: 61: 53: 46: 41: 37: 33: 19: 2531: 2327:Oldest Dryas 2297:Interstadial 2292:Interglacial 2275:Time periods 2206:, California 2200:, Washington 1952: 1941:Glacifluvial 1890:Depositional 1813:Lake Chicago 1808:Lake Agassiz 1651: 1572:Depositional 1562:Zungenbecken 1560: 1491:Glacial lake 1486:Glacial horn 1400:Mass balance 1388:Measurements 1324:Accumulation 1248:Glacier head 1243:Glacier cave 1187:Rock glacier 1076: 1035: 1014:. Retrieved 1009: 1000: 989: 968: 960: 948:. Retrieved 943: 934: 923:. Retrieved 919:the original 909: 898:. Retrieved 896:. 2017-04-25 893: 884: 865: 859: 844: 840: 821: 815: 798: 792: 783: 764: 741: 722: 692: 686: 676:29 September 674:. Retrieved 670:the original 665: 655: 644:. Retrieved 640:the original 630: 619: 553:Rainbow Lake 542: 511: 497: 482: 479: 448: 438: 429:Tweed Valley 425:Berwickshire 418: 367: 314: 306: 291:deglaciation 287:inland dunes 284: 268: 260: 251: 228: 221: 205: 204:The synonym 203: 186:Eiscir Riada 184: 180: 154: 152: 101:serpent kame 100: 96: 92: 88: 84: 80: 76: 74: 67:in northern 36: 2337:Pleistocene 2332:Older Dryas 2194:, Wisconsin 2186:Oneida Lake 2182:, Wisconsin 2158:, Wisconsin 2140:, Wisconsin 2134:, Wisconsin 2122:, Wisconsin 2116:, Minnesota 2110:, Wisconsin 2104:, Wisconsin 2092:, Wisconsin 1978:Outwash fan 1973:Kettle hole 1866:Ribbon lake 1823:Teays River 1677:Outwash fan 1672:Kettle hole 1556:Valley step 1536:Trough lake 1516:Ribbon lake 1476:Finger lake 1218:Bergschrund 547:in upstate 374:UppsalaĂĄsen 321:cranberries 282:is common. 214:, "ridge". 127:embankments 45:Fulufjället 2553:Soil creep 2256:Antarctica 2249:Antarctica 2235:Monte Rosa 2188:, New York 1968:Kame delta 1927:Till plain 1818:Lake Tight 1704:Glaciology 1687:Urstromtal 1667:Kame delta 1619:Till plain 1416:Jökulhlaup 1374:Starvation 1253:Ice divide 1167:Ice stream 1016:2015-07-30 925:2013-12-02 900:2022-07-13 894:WorldAtlas 646:2015-06-30 612:References 557:Keese Mill 410:Punkaharju 380:city. The 109:stratified 2558:Landslide 2546:Hillslope 2176:, Montana 2073:, Nunavut 2067:, Ontario 2061:, Ontario 2055:, Alberta 2043:, Ontario 2031:, Alberta 2025:, Ontario 1849:Erosional 1842:Landforms 1449:Erosional 1441:Landforms 1312:Processes 1293:Randkluft 1288:Penitente 1233:Dirt cone 1162:Ice shelf 1157:Ice sheet 1152:Ice field 950:30 August 317:bear root 255:tributary 244:Esker in 235:crevasses 169:Old Irish 153:The term 133:Etymology 120:glaciated 65:Billudden 43:Esker at 2591:Category 2486:Bed load 2415:Category 2240:Svalbard 2170:, Nevada 1948:Diluvium 1709:Category 1647:Diluvium 1642:Alpentor 1551:U-valley 1395:Ice core 1364:Plucking 1319:Ablation 1303:Terminus 1228:Crevasse 1223:Blue ice 1123:Glaciers 915:"Eskers" 575:See also 549:New York 532:between 465:through 455:Michigan 406:glaciers 388:to lake 386:Nyköping 271:sediment 2568:Aeolian 2537:Drumlin 2527:Moraine 2505:Glacial 2218:Eurasia 1907:Moraine 1897:Drumlin 1766:General 1589:Moraine 1579:Drumlin 1506:Nunatak 1369:Retreat 1334:Calving 1278:Moraine 1263:Icefall 1201:Anatomy 1172:Ledoyom 1147:Ice cap 1041:188–191 551:. The 507:Nunavut 485:Nunavut 467:Lansing 402:Tampere 394:Pispala 378:Uppsala 302:Lapland 299:Finnish 295:Swedish 276:Bedding 218:Geology 191:Ireland 183:is the 124:railway 69:Uppland 2597:Eskers 2164:, Utah 2152:, Ohio 2083:States 2081:United 2016:Canada 1983:Sandur 1682:Sandur 1526:Suncup 1511:P-form 1461:Cirque 1344:Motion 1283:Moulin 1142:Cirque 1137:Aufeis 1047:  977:  872:  851:  828:  771:  729:  699:  538:Calais 534:Bangor 526:Quebec 520:, the 518:Alaska 499:Uvayuq 493:Canada 463:DeWitt 421:Kemnay 390:Siljan 370:Sweden 364:Europe 199:Galway 195:Dublin 181:eiscir 164:eiscir 147:Alaska 116:gravel 85:eschar 18:Eskers 2532:Esker 2464:Water 1953:Esker 1856:Fjord 1652:Esker 1481:Fjord 1456:ArĂŞte 1379:Surge 1339:Creep 1298:SĂ©rac 1130:Types 475:Mason 451:state 325:bears 233:, in 193:from 173:escir 161:word 159:Irish 155:esker 105:ridge 99:, or 87:, or 81:eskar 77:esker 2576:Dune 1963:Kame 1714:List 1662:Kame 1531:Tarn 1431:Tuya 1238:Firn 1045:ISBN 975:ISBN 952:2022 870:ISBN 849:ISBN 826:ISBN 769:ISBN 727:ISBN 697:ISBN 678:2011 599:Kame 536:and 487:and 471:Holt 469:and 319:and 297:and 114:and 112:sand 97:osar 93:asar 803:doi 524:in 516:in 491:in 453:of 412:in 400:in 396:'s 368:In 335:to 331:to 197:to 145:in 107:of 75:An 2593:: 1043:. 1008:. 942:. 892:. 799:54 797:. 750:^ 711:^ 664:. 571:. 540:. 495:. 477:. 431:. 416:. 392:. 372:, 304:. 211:ĂĄs 206:os 171:: 129:. 95:, 89:os 83:, 79:, 2449:e 2442:t 2435:v 1753:e 1746:t 1739:v 1115:e 1108:t 1101:v 1053:. 1019:. 983:. 954:. 928:. 903:. 878:. 834:. 809:. 805:: 777:. 735:. 705:. 680:. 649:. 167:( 34:. 20:)

Index

Eskers
Esker (disambiguation)

Fulufjället


Billudden
Uppland
ridge
stratified
sand
gravel
glaciated
railway
embankments

Denali Highway
Alaska
Irish
Old Irish
fluvio-glacial
Eiscir Riada
Ireland
Dublin
Galway
glacial maximum
supraglacial channels
crevasses

Sims Corner Eskers and Kames

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