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Chapter 3: Geologic Structure and Landforms

3.32: Deltas in Red Deer Lake

Red Deer Lake occupies a basin scoured into Devonian sediments north of the Porcupine Hills (part of the Manitoba Escarpment). This photo shows part of the southwest shore of the lake. Red Deer River 1, which flows between wooded levees (natural embankments) 2, enters the lake from the northwest and has deposited a “birds foot” type of delta 3 characteristic of water bodies without significant tidal fluctuation. The river splits into two distributaries 4, both of which deposit sediment where they enter the lake resulting in dark-toned areas 5. On a smaller scale, Armit River 7 has deposited a similar delta 8, and further south Camp Seven Creek 9 has created another coastal projection 10. The sub-parallel lines 11 represent former higher lake levels.

Most of Red Deer Lake is light-toned but dark areas appear where rivers enter and deposit sediment 5 and 12, and sediment swirls are clearly seen in the north 13.

Figure 3.32: Deltas in Red Deer Lake

Figure 3.32: Deltas in Red Deer Lake

Figure 3.32

Vertical air photograph: A15973-116

Flight height: 20,000 feet a.s.l.; lens focal length: 152.17 mm

Date: May 14, 1958

Scale: 1:40,000 (approx.)

Location: Townships 45 and 46, Ranges 28 and 29 WI

Map sheets: 1:250,000 63C Swan Lake

1:50,000 63C/14 Barrows