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.
Darwin's 1839 work and T. F. Jamieson's (1863) paper led to a shift in Darwin's thinking about his Glen Roy theory, which he abandoned after reading Jamieson's paper but agreed with Prestwich's critique of Jamieson's interpretation of the Glen Turret delta.