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Table of Contents - Memoir 190Plugs and Plug Circles: A Basic Form of Petterned Ground, Cornwallis Island, Arctic Canada Origin and Implications |
Abstract
Abbreviations Introduction and acknowledgments General Earlier observations Occurrences in emerged beach gravel Occurrences in miscellaneous deposits PE 82-1 PE 83-3 Signal Hill plateau Occurrences in disintegrating bedrock PE 86-3 PE 88-1 Sheringham Point Gypsum diapir, west coast, Cornwallis Island Mould Bay, Prince Patrick Island Miscellaneous observations Terrain influences Weathering Transitional patterned-ground forms Vicinity ES B S-Circle Excavation 88-A and vicinity Vicinity North Transmitter Station Vicinity TACAN building Vicinity VOR installation Plateau above Small Lake Lake 2 km north of Helen Haven Characteristics of plugs and plug circles Constitution: Review Constitution: Discussion Morphology, structure, and fabric: Review Morphology, structure, and fabric: Discussion Pattern: Review Pattern: Discussion Other characteristics: Review Other characteristics: Discussion Observations in other regions Hypotheses of origin Radial frost sorting Problems Problems Modified hypothesis—A free-convection model Problems Problems Problems Problems Problems Surfaceward seepage Initiation Dynamics Problems Pattern evolution Summary and conclusions Cornwallis Island occurrences Regional distribution Origin Transitional forms Significance Tables 1–16 Appendix A: Climate summary, Resolute A, Cornwallis Island, N.W.T., 1947–1990 Appendix B: Soil temperatures, Resolute, Cornwallis Island, N.W.T. Appendix C: Endnotes References cited Index |