Chapter 3: Geologic Structure and Landforms
Geologic interpretation of images begins with the identification of lineaments, “regional linear features caused by linear arrangement of regional morphological features such as streams, escarpments, and mountain ranges and tonal features that in many areas are the surface expressions of fractures or fault zones.”[i] The emphasis in this section is on geologic structures and landforms, both of which can be easily identified on air photographs and other images.
The sequence followed here is that often found in geomorphology books. Geologic structures and structurally controlled landforms are illustrated first, followed by images of mass wasting and of the results of the agents of erosion—running water, ground water, ice, wind and the sea. The meandering rivers of southern
3.64: Gravel Pits in the Birds Hill Esker Northeast of Winnipeg
“Perhaps the best known esker [in
Two questions remain for the interpreter: what are the white dots in the northeast 9 and what are the white streaks 10 in the south.
Figure 3.64: Gravel Pits in the Birds Hill Esker Northeast of Winnipeg
Vertical air photograph: A27254-131
Flight height: 13,300 feet a.s.l.; lens focal length: 152.033 mm
Date: April 14, 1988
Scale: 1:24,400 (approx.)
Location: Townships 11 and 12; Ranges 4 and 5 EI
Map sheets: 1:25,000 62H
1:50,000 62H/15 Dugald
[i] Corkery, T M. op. cit. 1996, 11-22.