A streamlined landscape 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.
Reference
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.
http://www.nr.gov.nl.ca/mines&en/geosurvey/publications/cr2006/liverman.pdf
Copyright © 2006
by Douglas E. Cox
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