a. Geol. See quot. 1865.
1849. Lyell, 2nd Visit U. S. (1850), II. 354. I believe the formations called Taconic, in the United States,… to be simply Silurian strata much altered, and often quite metamorphic.
1865. Page, Geol. Terms, Taconic, a term applied by the late Professor Emmons to the rocks east of the Hudson (from the Taconic range lying along the western slope of the Green Mountains),… which consist of slates, quartz-rock, and lime-stones of Lower Silurian or perhaps more properly of Upper Cambrian age.
