Language: French, with trilingual summary in English, French, and German
Interest in the interpretation of palaeoenvironments has increased sharply in recent years with the growing importance of studies of the climate of the past. Wherever possible, researchers are attempting to interpret palaeoenvironments by comparing ancient microfossil assemblages with modern populations.
The Beaufort Sea coast (Canada: Yukon, NWT coast) is an area of particular interest to studies of coastal palaeoenvironments as the area is especially sensitive to short and long term environmental changes.
The authors have sampled and studied surface sediments and their diatom assemblages in an effort to establish the characteristics of modern environments as references/analogues to palaeoenvironments for future stratigraphic studies. The sampled environments are believed to represent the full range of sedimentary facies that may have been preserved in the Holocene stratigraphic record of the Beaufort shelf. The sampled enviroments include the coastal freswater area, backbarrier region, the shoreface, inner shelf and the MacKenzie Delta front area. Diatom assemblages with 225 taxa representing 60 genera are presented and the palaeolecological implications of their distribution are discussed. A taxonomic overview and a short description of the distribution for each taxon are also included.
A CD-ROM (Win95/NT, MACOS 7.1) is included to interactively present the complex environmental data and the distributional patterns of individual diatom taxa.
Chapter One: Introduction 1
Chapter Two: The southeastern Beaufort Sea coasts 4
2.1 The Tuktoyaktuk Coastlands 4
2.2 Holocene history 7
2.3 Coastal oceanography 8
Chapter Three: Diatom assemblages 17
3.1 Methods 17
3.2 General distribution 21
3.3 Thermokarst environments 27
3.4 Backbarrier environments 36
3.5 Shoreface and inner shelf 45
3.6 Delta front 53
3.7 Biogeographical considerations 56
3.8 Paleoenvironmental implications 57
Chapter Four: Diatom taxa 65
4.1 Centrales 68
4.2 Pennales 76
Appendix I: Raw environmental data for the 74 sampling sites of the southeastern Beaufort Sea coasts 235