Search Textbook

Table of Contents
Foreword
Preface
Glossary

Chapter 3: Geologic Structure and Landforms

3.3: Folded Structures in Precambrian Sedimentary and Metamorphosed Sedimentary Rocks North of Snow Lake

In this area there is a close relationship between structure and topography, the various folds forming a series of ridges and valleys resulting from differential erosion of the various layers. Compton Lake 1 “lies in the trough between a domelike fold in the west 2 and the Herblet Lake Gneissic Dome to the east”3.[i] Radial joints on the west side of the latter result in lines of weakness which have been exploited by weathering and the agents of erosion to produce low-lying areas which are partially filled with surficial deposits 4. A small anticline bounds Compton Lake on its southwest side 5. Snow Creek 6 exits Compton Lake southwards to Squall Lake (which is shown on figure 3.1).

The tonal variations in the lakes vary from very dark grey (Drysdale Lake 7) to almost white at the south end of Compton Lake, the light tone resulting from the relationship between water surface, sun angle and camera lens, to give specular reflection.

Figure 3.3: Folded Structures in Precambrian Sedimentary and Metamorphosed Sedimentary Rocks North of Snow Lake

Figure 3.3: Folded Structures in Precambrian Sedimentary and Metamorphosed Sedimentary Rocks North of Snow Lake

Figure 3.3

Vertical air photograph(s): A13398-129

Flight height: 16,700 feet a.s.l.: lens focal length : 151.65 mm

Scale: 1:32,000 (approx.)

Date: July 8, 1952

Location: Township 70, Range 18 WI

Map sheets: 1:250,000 63N Kississing Lake

1:50,000 63N/1 Nightingale Lake

Notes

[i] Mollard and Janes. op. cit., 24.