Taconicadj.
/təˈkɒnɪk/ Geology.
a. See quot. 1865.
ΘΚΠ
the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > primary or Palaeozoic > Silurian > specific
Taconic1842
Ludlovian1855
wenlockian1855
Salopian1869
Downtonian1879
Valentian1879
Gotlandian1909
Salinan1909
1842 E. 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.
1849 C. 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 D. Page Handbk. Geol. Terms (ed. 2) 427 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.
ΘΚΠ
the world > the earth > structure of the earth > formation of features > tectonization or diastrophism > [adjective] > orogenesis > specific
hercynian1895
Laramide1895
Caledonian1903
Armorican1906
Variscan1906
Taconic1908
Saalian1931
Pfalzian1932
Shamvaian1947
pan-African1964
1908 Bull. Geol. Soc. Amer. 20 503 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.
1980 Sci. 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.
This entry has not yet been fully updated (first published 1910; most recently modified version published online September 2018).
<
adj.1842