downstream toward the mouth of the creek. Cannon has not found any Denver sandstone south of the present creek channel cutting it from the river channel, from which it may be inferred that it was part of the original channel. The character of the deposit, too, is more in accord with the idea of deposition by flood waters of a large stream. Prof. Cannon, however, says that long observation teaches him that there is a vague, indescribable, indefinable difference between the intercalated gravel beds in Green Mt. Creek valley and those in the main valley. If the deposits are distinct in origin, the gravels of the Platte deposits should contain elements derived from South Platte Canyon which could not well occur in Green Mountain debris. These gravel beds are local, irregular and usually of small extent so far as my
