A streamlined landscape in eastern Newfoundland

DEM showing streamlined features in eastern Newfoundland
The image above is a Digital Elevation Model recently published by the Newfoundland Geological Survey showing streamlined features in eastern Newfoundland. This image was made using data obtained using radar techniques during a space shuttle mission.

The image shows a radial pattern of flow in eastern Newfoundland. Radial patterns can be explained by the flow of seawater due to uplift when the land was submerged. As water depth decreased, smaller streamlined features were superimposed on previously formed, larger features. Channels were eroded as the flow became confined at the perimeter of the land where flow rates increased. The drumlins and flutings vary in contents from all drift to all bedrock. This range in composition can be explained by the author's in situ disintegration explanation of the drift. Disintegation accompanied unloading as overburden was eroded by the currents generated by uplift of submerged lands. The process of disintegration penetrated downwards to various depths, changing rock or sediment to sand and gravel of the drift. Eskers are effects of expansion of drift as it was disintegrated.


Liverman, D., Batterson, M., Bell, T., Nolan, L., Marich, A., Putt, M., 2006. Digital elevation models from shuttle radar topography mission data - new insights into the Quaternary history of Newfoundland. Current Research, Newfound and Labrador Department of Natural Resources Geological Survey, Report 06-1:177-189.


Copyright © 2006 by Douglas E. Cox
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