description Devil's Track esker complex Overview
The Devil's Track esker complex is a prominent glacial geological formation located near Grand Marais in Cook County, Minnesota. Composed of extensive sand and gravel deposits, the ridge system was created by sediment deposition from meltwater rivers flowing within or beneath glaciers during the Quaternary period. It is noted by geologists for its substantial topographic relief and well-preserved physical structure. The area serves as an accessible site for observing the glacial history of the North Shore region.
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What is the Devil's Track esker complex?
It is a long ridge of sand and gravel deposited by meltwater flowing inside or beneath a glacier. The ridge remained after the ice melted, making it a glacial landform rather than a bedrock mountain.
Where is the Devil's Track esker complex located?
The formation lies near Grand Marais in Cook County, Minnesota, along the North Shore region. A University of Minnesota geology study describes the Devil Track esker as roughly 30 kilometres long, as shown in this [geology report](https://conservancy.umn.edu/server/api/core/bitstreams/5729a95b-8791-4cb8-bb03-2f8b3ccfa39a/content).
What is the esker made of?
Its main materials are glacial sand and gravel carried by meltwater rivers beneath or within the former ice sheet. That loose sediment explains the ridge's uneven surface and its importance for studying ancient drainage beneath the glacier.
How is an esker different from a moraine?
An esker records the path of a meltwater channel, while a moraine is sediment pushed or left at the edge or base of a glacier. The Devil's Track formation is therefore useful evidence of subglacial water flow in northeastern Minnesota.
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