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to flow from the end of the retreating glacier. Certainly there must have been considerable post glacial erosion, as the grade of the gulch is steep and the present stream is swift. The whole wide valley is a beautiful example of glacial topography. The glacier headed on E side of James Peak. Teller Lake is morainal, and is very near the mouth of the gulch. At present South Boulder is the main stream and Mammoth is a tributary. Came down E valley on way back, and followed railroad through cuts which expose gneiss ridges extending out diagonally into the South Boulder valley, apparently the result of fluting by the glacier as in the upper North Boulder canyon. A rough diagram is as follows:
