The appearance of the Geologic Map of New York in 1961 (Fisher and others 1961) focused attention in the Adirondacks on the great variability in the quality and detail with which various parts of the region had been mapped. It became clear that extensive areas of either very old mapping, or only broad reconnaissance mapping undertaken in preparation for the State Geologic Map (Isachsen, unpub. maps), lay in the southern half of the Adirondacks. This situation made the area attractive to new workers interested in geological mapping and structural synthesis, and resulted in numerous new investigations (de Waard, 1962, 1964; Walton and de Waard, 1963; de Waard and Romey, 1963, 1968; McLellahd, 1969, 1972, 1978; Nelson, 1968; Letteney, 1969; Glennie, 1973; Geraghty, 1978).