Pingos are true perennial permafrost mounds. It is generally accepted that there are two main types of pingos in terms of genesis: hydrostatic (closed system) and hydraulic (open system). It is here proposed that a third category of ‘polygenetic’ (or ‘mixed') pingos should also be recognized in the light of published work and recent investigations. The lack of comprehension of hydraulic pingo genesis would seem to add weight to this proposal. Since suitable conditions for the formation of pure hydrostatic pingos are rarely met outside the Mackenzie Delta/Tuktoyaktuk Peninsula area the ‘world’ type of pingo is most likely to be of an hydraulic or ‘polygenetic’ variety and thus further investigation is warranted, particularly for the elucidation of the palaeoenvironmental inferences of ‘relict pingos'.
AÊ hman, R. 1973: Pingos i Adventdalen och Reindalen pa Spetsbergen. Svensk Geografisk A AÊ rsbok 49, 190-97.
2.
Allen, C. R., O'Brien, R. M. G. and Sheppard, S. M. F.1976: The chemical and isotopic characteristics of some northeast Greenland surface and pingo waters. Arctic and Alpine Research8, 297-317.
3.
Ballantyne, C. K. and Harris, C.1994: The periglaciation of Great Britain. Cambridge: Cambridge University Press.
4.
Bennike, O.1983: Pingos in Peary Land, north Greenland. Bulletin Geological Society of Denmark32, 185-212.
5.
Bleich, K. E.1974: On the formation of pingos in the Mackenzie Delta, NWT. Polarforschung44, 60-66.
6.
Bobov, N. G.1960: Pingo formations under modern conditions in the watershed between the Lena and Vilyui Rivers. Geographical Series, Academy of the Sciences of the USSR5, 64-68.
7.
Bostrom, R. C.1967: Water expulsion and pingo formation in a region affected by subsidence. Journal of Glaciology6, 568-572.
8.
Burgess, M., Judge, A., Taylor, A. and Allen, V. 1982: Ground temperature studies of permafrost growth at a drained lake site, Mackenzie Delta. In Proceedings of the 4th Canadian Conference on Permafrost, Ottawa: National Research Council of Canada, 3-11.
9.
Carter, L. D. and Galloway, J. P.1979: Arctic coastal plain pingos in National Petroleum Reserve in A Alaska. In Johnson, K. M. and Williams, J. R., editors, The United States Geological Survey in Alaska, accomplishments during 1978 804B, B33-B35.
10.
Christiansen, H. H.1995: Observations of open system pingos in a marsh environment, Mellemfjord, Disko, central west Greenland. Geografisk Tidsskrift95, 42-48.
11.
Christiansen, H. H.1997: Open system pingos in Mellemfjord, Disko, central west Greenland: a reply to Gurney and Worsley. Geografisk Tidsskrift97, 157-159.
12.
Corte, A. E. 1983: Cryogenic morphology at Seymour Island (Marambio) Antarctica. A progress report. In Proceedings of the 4th International Conference on Permafrost, Washington, DC: National Academy Press, 192-197.
13.
Cruikshank, J. G. and Colhoun, E. A.1965: Observations on pingos and other landforms in Schuchertdal, northeast Greenland. Geografiska Annaler47A, 224-236.
14.
Crystal, B.1997: The power of cool: nature's ‘frost engines’ are explaining some weird arctic landscapes. New Scientist155, 20-20.
15.
Ferrians, O. J. 1988: Pingos in Alaska: a review. In Proceedings of the 5th International Conference on Permafrost, Trondheim: Tapir Publishers, 734-739.
16.
Fitzsimons, S. J.1989: Reinterpretation of pingos in Antarctica. Quaternary Research32, 114-116.
17.
Flemal, R. C.1976: Pingos and pingo scars: their characteristics, distribution and utility in reconstructing former permafrost environments. Quaternary Research6, 37-53.
18.
French, H. M.1975: Pingo investigations and terrain disturbance studies, Banks Island, District of Franklin. Geological Survey of Canada Paper75- 1A, 259-264.
19.
French, H. M. and Dutkiewcz, L.1976: Pingos and pingo-like forms, Banks Island, western Canadian Arctic. Biuletyn Peryglacjalny26, 211-222.
20.
Gell, W. A.1978: Fabrics of icing-mound and pingoice in permafrost. Journal of Glaciology20, 563-569.
21.
Gurney, S. D.1995: A reassessment of the relict Pleistocene ‘pingos’ of west Wales: hydraulic pingos or mineral palsas?Quaternary Newsletter77, 6-16.
22.
Gurney, S. D. and Worsley, P.1997a: A discussion on pingos in Mellemfjord, Disko, central west Greenland. Geografisk Tidsskrift97, 154-156.
23.
Gurney, S. D. and Worsley, P.1997b: Genetically complex and morphologically diverse pingos of the Fish Lake area, south west Banks Island, NWT, Canada. Geografiska Annaler79A, 41-56.
24.
Gussow, W. C.1954: Piercement domes in the Canadian Arctic. Bulletin of the American Association of Petroleum Geologists38, 2225-2226.
25.
Hamilton, T. D. and Obi, C. M.1982: Pingos in the Brooks Range, northern Alaska, USA. Arctic and Alpine Research14, 13-20.
26.
Holmes, G. W., Foster, H. L. and Hopkins, D. M. 1966: Distribution and age of pingos in interior Alaska. In Proceedings of the International Conference of Permafrost, Washington, DC: National Research Council, 88-93.
27.
Holmes, G. W., Hopkins, D. M. and Foster, H. L.1968: Pingos in central Alaska. United States Geological Survey Bulletin 1241-H. Washington, DC: US Government Printing Office.
28.
Johnston, G. H. and Brown, R. J. E.1961: Effect of a lake on distribution of permafrost in the Mackenzie River Delta. Nature192, 251-252.
29.
Kühle, M.1985: Permafrost and periglacial indicators on the Tibetan Plateau from the Himalayan Mountains in the south to the Quilian Shan in the north (28-408 N). Zeitschrift für Geomorphologie29, 183-192.
30.
Leffingwell, E. de K.1919: The Canning River region, northern Alaska. In United States Geological Survey Professional Paper 109, Washington, DC: US Government Printing Office, 150-155.
31.
Liestö l, O.1977: Pingos, springs and permafrost in Spitsbergen. In Norsk Polarinstitutt A Êrbok 1975, KuOslo: Norsk Polarinstitutt, 7-29.
32.
Mackay, J. R.1962: Pingos of the Pleistocene Mackenzie River Delta area. Geographical Bulletin18, 21-63.
33.
Mackay, J. R.1963: The Mackenzie River Delta area NWT. Geographical Branch, Mines and Technical Surveys, Ottawa, Memoir 8.
34.
Mackay, J. R.1968: Discussion of the theory of pingo formation by water expulsion in a region affected by subsidence. Journal of Glaciology7, 346-351.
35.
Mackay, J. R.1973: The growth of pingos, western Arctic coast Canada. Canadian Journal of Earth Sciences10, 979-1004.
36.
Mackay, J. R.1976a: The age of Ibyuk pingo, Tuktoyaktuk Peninsula, District of Mackenzie. Canadian Geological Survey Paper76-1B, 59-60.
37.
Mackay, J. R.1976b: On the origin of pingos -a comment. Journal of Hydrology30, 295-298.
38.
Mackay, J. R.1977: Pulsating pingos, Tuktoyaktuk Peninsula, North West Territories. Canadian Journal of Earth Sciences14, 209-222.
39.
Mackay, J. R.1978: Sub-pingo water lenses, Tuktoyaktuk Peninsula, North West Territories. Canadian Journal of Earth Sciences15, 1219-1227.
40.
Mackay, J.R. 1979: Pingos of the Tuktoyaktuk Peninsula area, Northwest Territories. Géographie physique et Quaternaire 33, 3-61.
41.
Mackay, J. R.1985: Pingo ice of the western Arctic coast, Canada. Canadian Journal of Earth Sciences22, 1452-1464.
42.
Mackay, J. R.1987: Some mechanical aspects of pingo growth and failure, western Arctic coast Canada. Canadian Journal of Earth Sciences24, 1108-1119.
43.
Mackay, J. R.1988: Pingo collapse and paleoclimatic reconstruction. Canadian Journal of Earth Sciences25, 495-511.
44.
Mackay, J. R.1990: Seasonal growth bands in pingo ice. Canadian Journal of Earth Sciences27, 1115-1125.
45.
Mackay, J. R.1994: Pingos and pingo ice of the western Arctic coast, Canada. Terra106, 1-11.
46.
Mackay, J. R., Konischev, V. N. and Popov, A. I. 1978: Geologic controls on the origin, characteristics and distribution of ground-ice. In Proceedings 3rd International Conference on Permafrost, Ottawa: National Research Council, 1-18.
47.
Müller, F. 1959: Beobachtungen uber pingos. Meddelelser om Grùnland 153.
48.
O'Brien, R.1971: Observations on pingos and permafrost hydrology in Schuchertdal, north east Greenland. Meddelelser om Grùnland195-195.
49.
Ozawa, H.1997: Thermodynamics of frost heaving: a thermodynamic proposition for dynamic phenomena. Physical Review E56, 2811-2816.
50.
Pickard, J.1983: Pingos in Antarctica. Quarternary Research20, 105-109.
51.
Mu Pissart, A.1967: Les pingos de L'Isle Prince-Patrick (76/North-120/West). Geographical Bulletin9, 189-217.
52.
Mu Pissart, A.1988: Pingos: an overview of the present state of knowledge. In Clark, M. J., editor, Advances in Periglacial Geomorphology, Chichester: Wiley, 279-297.
53.
Pissart, A. and French, H. M.1977: The origin of pingos in regions of thick permafrost, western Canadian Arctic. Quaestiones Géographicae4, 149-159.
54.
Porsild, A. E.1938: Earth mounds in unglaciated Arctic, north western America. Geographical Review28, 46-58.
55.
Rampton, V. N. and Bouchard, M.1975: Surficial geology of the Tuktoyaktuk, District of Mackenzie. Geological Survey of Canada Paper 74-53.
Rosenkrantz, A.1942: A geological reconnaissance of the southern part of the Svartenhuk Peninsula, West Greenland. Meddelelser on Grùnland135-135.
58.
Ryckborst, H.1975: On the origin of pingos. Journal of Hydrology26, 303-314.
59.
Ryckborst, H.1976: On the origin of pingos -a reply. Journal of Hydrology30, 299-301.
60.
Seppälä, M.1988: Rock pingos in northern Ungava Peninsula, Québec, Canada. Canadian Journal of Earth Sciences25, 629-634.
61.
Walker, D. A., Walker, M. D., Everett, K. R. and Webber, P. J.1985: Pingos of the Prudhoe Bay region, Alaska. Arctic and Alpine Research17, 321-336.
62.
Watson, E.1971: The remains of pingos in Wales and the Isle of Man. Geological Journal7, 381-392.
63.
Worsley, P. and Gurney, S. D.1996: Geomorphology and hydrogeological significance of the Holocene pingos in the Karup Valley area, Traill Island, northern east Greenland. Journal of Quaternary Science11, 249-262.
64.
Yoshikawa, K.1991: Age of growth of two pingos, Sarqaq Dalen, west central Greenland. Permafrost and Periglacial Processes2, 245-252.
65.
Yoshikawa, K.1993: Notes on open-system pingo ice, Adventdalen, Spitsbergen. Permafrost and Periglacial Processes4, 327-334.
66.
Yoshikawa, K. and Harada, K.1995: Observations on nearshore pingo growth. Adventdalen, Spits-bergen. Permafrost and Periglacial Processes6, 361-372.
67.
Zoltai, S. C.1983: Pingos on Bylot Island, NWT, Canada. Polarforschung53, 43-48.
