THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



«»•» 



Art. XIII. — The Geology of the North End of the Taconic 

 Range; by T. Nelson Dale.* (With Plate XI.) 



The Taconic range lies west of the Green Mountain range, 

 and extends from near Fishkill on the Hudson, N.N.E., to a 

 point two miles south of Brandon in Rutland County, Vt., 

 where, geologically speaking, it ends. It consists mainly of 

 schists of Ordovician (Hudson) age, but as its northern part is 

 more or less merged in a hilly belt of Cambrian slate and quartz- 

 ite, flanking it on the west and extending four miles beyond it, 

 the range may be said, physiographically at least, to extend almost 

 to the Addison-Rutland County line and thus to have a total 

 length of 200 miles. 



In the published geological maps the north end of this range 

 has been variously represented : (1) As consisting of a narrow 

 tongue of Cambrian slate extending as far north as Cornwall, 

 bordered on both sides by the schist of the Taconic range, which 

 extends only to Sudbury village on the west and to a point 

 S.W. of Brandon village on the east.f 



(2). Of similar constitution but cut off between Whiting and 

 Sudbury by a narrow strip of limestone connecting the lime- 

 stone of the Vermont Valley with that of- Orwell. J 



(3) Of a simple belt of Cambrian shale, etc., extending as far 

 north as Weybridge.§ 



* Published by permission of tbe Director of the U. S. Geological Survey. 



f Hitchcock and Hager : Report of the Geology of Vermont, vol. ii, pi. i, 

 1861. 



X Dana (James D.): An account of the discoveries in Vermont Geology of 

 the Eev. Augustus Wing, this Journal, vol. xiii, 1877. Map opposite p. 334 

 but modified by explanations on pp. 336, 339. and embodied in another map in 

 vol. xiv, p. 36, in paper by same author entitled : Supplement to the account 

 of the discoveries in Vermont Geology of the Rev. Augustus Wing. 



A copy of Mr. Wing's original MSS, kindly loaned to the author of the pres- 

 ent paper by Prof. H. M. Seely of Middlebury, contains a sketch map show- 

 ing the topographic details of this E.-W. strip of limestone. 



§Walcott (Charles D.) : The Taconic System of Emmons, and the use of the 

 name Taconic in Geologic nomenclature ; this Journal, vol. xxxv, pi. iii, 1888. 



Am. Jour. Sci. 

 13 



-Fourth Series, Vol. XVII, No. 99.— March, 1904. 



