MOUiNT GHKYLOCK: ITS STIiUCTUIiAL AND AREAL GEOLOGY.' 



I>y T. Nelson Dale. 



historic. 



Mount Greylock, or Saddle mountain, has been an object of interest to 

 geologists for seventy years. The most important work in structural and 

 area] geology that has been done on the mountain is that of Prof. Chester 

 Dewey (1817-1829), Prof. Ebenezer Emmons (1833-1855), Prof. Edward 

 Hitchcock (1856-1861), and Prof. James 1). Dana (1871-1887.) Prof. Em- 

 mons built upon and extended the investigations male by Prof. Dewey. 

 In the writings of Profs. Dewey, Emmons, Hitchcock, and Dana, 2 the 

 general boundaries between the limestone of the Hoosic and Green river 

 valleys, and the schists of Greylock and Deer hill, and the quartzite of 

 Stone hill are given. The synclinal structure of the Greylock mass, and 



'• A report to Trot'. Raphael Pumpelly, in charge of the Archean 1 H\ ision, covering field work done 

 under hi.s direction in the summers of 1886, 1887. and part of 1888, by the writer, with the assistance 

 during 1886 and part of 1887 of Mr. Win. H. Hobos. 



- Amos Eaton : Index to the Geology of the Northern states. 1818. 2d ed. 1820. 



Chester Dewey : Sketch of the mineralogy and geology of the vicinity of Williams College, 

 Williatnstown, Massachusetts (in a letter to the editor of the American Journal of Science, dated 

 January 27, 1819, with a geologic map and section of the northwest part of Massachusetts). Am. 

 .lour. Sri., ser. I. vol. I, 1819, p. 337. 



Chester Dewey : Geological section from the Taconick range m Williamstown to tin- city of 

 Troy on the Hudson. Am. Jour. Sri., sit. i, vol.2. 1820, p. 246. 



Ainos Eaton: Geological and agricultural survey of the district adjoining the Erie canal. 

 1824. (This includes a section from Hoosac mountain, Savoy, to the Hudson at Troy. It is repro- 

 duced in a paper by C. 1>. Walcott in the Tenth Annual Kept.. I". S. Geol. Survey. 1888-89, p. 525.) 



Chester Dewey: A sketch of the geology and mineralogy of the western part of Massachusetts and 

 a small part of the adjoining states (with a geologic map of the county of Berkshire, Massachusetts, 

 and id' a small part of tin- adjoining states). Am. .lour. Sci., ser. i, vol. s. part 2. 1824, p. 1. 



Ainos l'.aton : A geological nomenclature for North America, founded upon surveys taken under 

 the direr I ion of the lion. Stephen Van Rensselaer. Alhanj . 1828. 



Chester Dewej . A general view of Berkshire county, forming parti of "A history of the county of 



