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Chapter 3: Geologic Structure and Landforms

3.79: Part of the Souris-Pembina Spillway East of Souris

The Souris-Pembina spillway, which carried water from glacial Lake Hind to glacial Lake Agassiz, can be seen crossing the photo from northwest to southeast 1. It has the characteristic steep sides (2 and 3) of glacial spillways, but the floor is not as flat as usual because the Souris River 4 has migrated laterally while incising itself into the spillway floor; scars indicating previous river positions can be seen 5. At several locations the river has eroded into the underlying shales of this area 6, seen in the river cliffs on the outside of river bends; some of the eroded shale has been deposited in a point bar 7. Several small creeks 8 drain to the Souris from both the north and south. North of the spillway the topography is typical of end moraine—hummocky with sloughs in depressions 9. Much of this land is too stoney and irregular for agriculture so patches of deciduous woodland—dark-toned—remain 10. To the south the land is flat, more typical of outwash deposits.

The lines of the DLS system are seen but are obscured along the spillway course. Some gravel roads follow section lines, but both PTH 10 11 and PR 348 12 diverge from them where they cross the spillway. The boundary between townships 6 and 7 runs across the area with a correction of about 0.75 miles (1.2 km) 13 in this location. A railway line—or at least its former route 14—can be seen running obliquely across the spillway and crossing the Souris at the abandoned settlement of Bunclody 15.

Figure 3.79: Part of the Souris-Pembina Spillway East of Souris

Figure 3.79: Part of the Souris-Pembina Spillway East of Souris

Figure 3.79

Vertical air photo: A24518-21

Flight height: 26,200 feet a.s.l.; camera focal length: 153.27 mm

Date: August 6, 1976

Scale: 1:49,900 (approx.)

Location: Townships 6 and 7; Ranges 19 and 20 WI

Map sheets: 1:250,000 62F Virden

1:50,000 62F/9 Souris

62G/5 Dunrea