Physiographic studies in the Colorado Front Range area disclose a number of rock glaciers in various stages of evolution. Detailed investigations show that the theories of Capps are substantially correct for rock glaciers originating in abandoned cirques, but that a number of factors not considered by him may be of importance. These factors are briefly discussed. Reconnaissances in other mountain areas suggest that rock glaciers and similar features are very common wherever relatively recent alpine glaciation has taken place.

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