The Urstrom is a geologists' name for a great glacial age river of the Polish and north German plain, which drained the combined melt-waters from the northern headwaters of the Alps and the southern part of the Scandinavian ice during the Devensian ice age.
- The Geology of Central Europe: Mesozoic and Cenozoic, Geological Society of London, 2008, edited by Tom McCann, Chap 19, pp1233-1234
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