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
3.14: Slumping in the Pembina Valley South of Darlingford
At the end of the Wisconsinan ice age, the
The southwest spillway wall, the valley of the northeast creek, and parts of the northeast spillway wall are all wooded (deciduous). Flat lands outside the valleys and some terraces on the northeast spillway wall 10 have been cleared for agriculture. One gravel road 11 and several paths 12 can be seen as well as three farms 13, all of which have shelterbelts to the north and west 14. A dugout 15 is located close to one farm.
Figure 3.14: Slumping in the Pembina Valley South of Darlingford
Vertical air photograph: A16181-172
Flight height: 10,500 feet a.s.l.; lens focal length: 152.63 mm
Date: July 20, 1958
Scale: 1:18,100 (approx.)
Location: Township 1, Range 7 WI
Map sheets: 1:250,000 62G Brandon
1:50,000 62G/1 Morden