| 释义 |
Taconic, a. Geol.|təˈkɒnɪk|
[f. the name of the Taconic Mountains in New England and New York State.]
a. See quot. 1865.
1842E. Emmons in Geol. N.Y. II. vii. 135 It has been deemed advisable to annex to the general account of the group of rocks of the northern district, a brief sketch of the services which constitute the Taconic System. 1849Lyell 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. 1865Page 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.
b. Epithet of an orogeny that occurred in Ordovician times in eastern North America.
1908Bull. Geol. Soc. Amer. XX. 503 The other three [emergences]..were of long duration and of great significance. These are: (1) The Taconic revolution..; (2) the Appalachian revolution.., and (3) the Laramide revolution. 1980Sci. Amer. Oct. 136/1 The southern Appalachians have evolved in a series of collisions of fragments of continental or island-arc material at the eastern edge of North America in the Taconic, the Acadian and the Alleghenian orogenies. |