1. A developmental phase of an erosion cycle in which landscape features have distinctive characteristic forms. 2. A phase in the historical development of a geologic feature. 3. A major subdivision of a glacial epoch. 4. Atime-stratigraphic unit ranking below series and above chronozone, composed of rocks formed during an age of geologic time. 5. The elevation of the water surface in a stream as measured by a river gage with reference to some arbitrarily selected zero datum. Also knonw as stream stage.
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