 Jamieson's paper on his investigations was published in 1863.Four decades after Darwin's 1839 paper and shortly before his death, in a letter to Joseph Prestwich, he said that he gave up his Glen Roy theory when he read T. F. Jamieson's (1863) paper but he agreed with Prestwich's criticism of Jamieson's interpretation of the Glen Turret delta.Interest in the Parallel Roads continues to this day, both among earth scientists intrigued by the dramatic processes that shaped that landscape, and among tourists attracted by the natural wonder of the landforms.