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
3.33: Part of the Saskatchewan River/Summerberry River Delta Northwest of Cedar Lake
The photograph shows two main river channels,
The main river channels are uniformly light-toned resulting from suspended sediment, whereas lakes are variable ranging from almost black 10, to dark
Figure 3.33: Part of the Saskatchewan River/Summerberry River Delta Northwest of Cedar Lake
Vertical air photograph: A13860-8
Flight height: 35,000 feet a.s.l.; lens focal length: 154.15 mm
Date: September 23, 1953
Scale: 1:19,000 (approx.)
Location: Townships 53 and 54, Ranges 23 and 24 WI
Map sheets: 1:250,000 63F The Pas
[i] Interpretation from Mollard and Janes, op. cit. 1984, 135.