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1900 W. M. Davis in Proc. Boston Soc. Nat. Hist. XXIX. 288 In the spring of 1899, I sent a brief note..to..Mr. G. K. Gilbert of Washington, telling him that all the lateral valleys seemed to be ‘hung up’ above the floors of the trunk valleys. His reply was long in coming..and he suggested that such laterals should be called ‘hanging valleys’—a term I have since then adopted. He fully agreed that hanging valleys presented unanswerable testimony for strong glacial erosion.

1932 W. H. Auden Orators i. 22 Arguments from the other side of the lake on the formation of hanging valleys.

1938 Sat. Rev. Lit. (U.S.) 1 Jan. 17/3 We go..to hear a well-informed ranger explain how a glacier makes a U-shaped valley, leaving hanging valleys to dump waterfalls over the edge.

1952 H. W. Tilman Nepal Himalaya ii. xii. 149 In a sort of hanging valley, where the slope eased off..we began searching for a camp site.

1963 D. W. Humphries & E. E. Humphries tr. H. Termier & G. Termier Erosion & Sedimentation v. 126 It may have tributaries, but these are often ‘hanging valleys’ with waterfalls.

1968 R. W. Fairbridge Encycl. Geomorphol. 522 Interesting examples of hanging valleys may also be seen entering fjords, notably in Norway and New Zealand. Hanging valleys also occur sometimes along non-glaciated coasts where the rate of cliff retreat is higher than the adjustment potential of the smaller streams, e.g., in the chalk cliffs in the south of England. They are also to be seen along youthful fault scarps.