. The Canadian field-naturalist. 10 The Canadian Field-Naturalist Vol. 83 Q 400- SEDIMENTS Poorly decomposed, fibrous, sphagnum peat Medium decomposed. woody, fibrous, sphagnum peat to well decomposed, woody, fibrous, sphagnum peat Aquatic sedge peat and gyttja _Ck]^ gyt^ja_ i Silty clay. I '^ Percentage of total arboreal pollen YRS. Figure 2. Mer Bleue Peat Bog pollen diagram (continued on opposite page). several diagrams it can with confidence be assumed to represent environmental changes of regional significance. It is therefore possible to establish a series of zones, gen
. The Canadian field-naturalist. 10 The Canadian Field-Naturalist Vol. 83 Q 400- SEDIMENTS Poorly decomposed, fibrous, sphagnum peat Medium decomposed. woody, fibrous, sphagnum peat to well decomposed, woody, fibrous, sphagnum peat Aquatic sedge peat and gyttja _Ck]^ gyt^ja_ i Silty clay. I '^ Percentage of total arboreal pollen YRS. Figure 2. Mer Bleue Peat Bog pollen diagram (continued on opposite page). several diagrams it can with confidence be assumed to represent environmental changes of regional significance. It is therefore possible to establish a series of zones, generally numbered from the youngest to the oldest, the boundaries between each being a time when one of these significant changes took place. Once these zones are established, more or less empirically, it is possible to deduce something about the nature of the environment, as far as the plants are concerned, during each period. In this way a cHmatic or environmental history of a region may be established. Two aspects of this must be clearly distinguished. One is the history of the region as a whole, a region of hundreds of square miles, the other is the history of the Mer Bleue and its immediate vicinity. The regional history may be deduced from features that are common to all or most of the diagrams, the local history must be based on the plants that grew in the bog or its immediate surroundings and reflected special conditions. For it is the local history of these special conditions with which \vt are concerned. Pollen. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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