Search Textbook

Table of Contents

Chapter 3: Geologic Structure and Landforms

3.59: An Esker in Northeastern Manitoba

The main esker 1 traversing the area on this photo trends north-northeast/south-southwest and is 9 miles (14.5 km) long, but the 1:250,000 map of the area (64P Nejanilini Lake) shows that it extends discontinuously for almost twice that length. It consists of one major ridge with a bifurcation 2 and light-toned sandy/gravelly deposits on either side 3. Another shorter esker 4 joins the main one from the northwest. Both have been superimposed on the underlying bedrock topography, and in the north the larger esker divides a large lake into two parts (5 and 6).

The Gordon River 7 flows in a general west to east direction across the area that is dotted by numerous lakes, variable in tone. Radcliffe Lake 8 and lakes to the west 9 and north 10 of it, as well as Gorrie Lake 11 and several lakes near the southern edge of the photo 12, are light grey which probably indicates that they are shallow, whereas some of the other lakes 13 are dark-toned because they are deeper.

This area lies within the shrub sub-zone of the forest/tundra transition vegetation zone[i] in which “a shrub tundra like community dominates, together with small open clumps of white or black spruce in more sheltered sites.”[ii] On the photograph the wooded areas are the dark-toned patches lying mainly along the watercourses 14.

Figure 3.59: An Esker in Northeastern Manitoba

Figure 3.59: An Esker in Northeastern Manitoba


Figure 3.59

Vertical air photograph: A15460-17

Flight height: 30,000 feet a.s.l.; lens focal length: 154.3 mm

Date: August 21, 1956

Scale: 1:58,000 (approx.)

Location of centre point: 59° 28'N, 97° 06'W

Map sheets: 1:250,000 64 P Nejanilini Lake

1:50,000 64 P/6 Fallis Lake



[i] Scott, op. cit. 1996, figure 4.2, 45.

[ii] Scott, op. cit. 1996, 53.