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
3.101: Part of the Lauder Sand Hills Northwest of Lauder
Sand deposited into
Land south of the river has been cleared for agriculture; the results of harvesting can be seen in one field 13 with rectangular straw stacks 14 and a pile of loose straw 15. Farm buildings are visible at 16.
Figure 3.101: Part of the Lauder Sand Hills Northwest of Lauder
Vertical air photograph: A16410-112
Flight height: 10,500 feet a.s.l.; lens focal length: 152.63 mm
Date: October 28, 1958
Scale: 1:17,500 (approx.)
Location: Townships 5 and 6; Ranges 24 and 25 WI
Map sheets: 1:250,000 62F Virden
1:50,000 62F/7 Hartney