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
3.66: Outwash Plateau at the Hudson Bay Company Reserve at Fort Ellice
The plateau shown here is a southward extension of that shown on figure 3.65. The plateau has a sharp edge 1; in the north the surface has the typical mottled appearance of outwash deposits 2 but in the south the surface is flatter 3. Grassland covers almost all the plateau surface; a dugout 4 in the east suggests that the area is used as animal pasture.
A small stream that drains east to the
Straight lines bound the Hudson Bay Company Reserve to south 11, west 12, and north 13. The reserve extends to the
Figure 3.66: Outwash Plateau at the Hudson Bay Company Reserve at Fort Ellice
Vertical air photograph: A18623-11
Flight height: 9,500 feet a.s.l.; lens focal length: 152.13 mm
Date: September 13, 1964
Scale: 1:16,350 (approx.)
Location: Township 16; Range 28 WI
Map sheets: 1:250,000 62K Riding Mountain
1:50,000 62K/6 Birtle