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Drumlins and Eskers in Northern Manitoba
Much of northern Manitoba is covered by a thin—in some cases very thin—layer of glacial drift. On this photo bedrock can be seen in the west 1 and east 2. In both cases northwest/southeast lineations can be seen (3 and 4). The general alignment of the topography is north-northeast/south-southwest and in two areas the surficial glacial deposits have been pulled into drumlinoid forms 5. Drumlins are thought to have been formed beneath an ice sheet which was sufficiently active to produce the characteristic elongate form. Numerous lakes—dark-toned—can be seen in the areas occupied by drumlins. The lakes have the same north-northeast/south-southwest alignment 6. Two eskers 7 and 8 can be seen. These ridges were deposited by water under or within the ice sheet and then dropped onto the underlying topography. Sandy sediments have been deposited on either side of one of the eskers producing light-tone areas on the photo 9.
The dark-toned triangular shaped area in the southeast corner 10 is a technical defect.