112 THE CAMBRIAN. Ibull.81. 



of the Paradoxides zone at Stissing, Dutchess County. In the lime- 

 stone and calcareous shale immediately overlying the Olenellus lime- 

 stone, at the south end of Stissing Mountain, he discovered a fauna 

 that is correlated with the Middle Cambrian or Paradoxides fauna, 

 thus establishing the middle member of the Cambrian system in addi- 

 tion to the Lower Cambrian and Upper Cambrian that had been pre- 

 viously found in this region. A plate illustrating the fauna accom- 

 panies the paper. 



In 1887 Mr. C. D. Walcott 1 published a description of the fauna oi 

 the Upper Taconic of Emmons, of Washington County, New York, 

 this a statement of the stratigraphic position of the fauna was made, 

 based on the correlation with the fauna of the Georgia slates of Ver- 

 mont. This was followed in 1888 by an account of the discovery oi 

 fossilsinthe Granular Quartz near Bennington, Vermont. 2 The discover] 

 was further described" in a paper which followed on the Taconic systei 

 of Emmons, 3 where an account is given of the mode of occurrence oi 

 the kt Granular Quartz" in western Massachusetts and Vermont. Tin 

 quartzite is referred to the Middle (now Lower) Cambrian zone, of whicl 

 the Olenellus bearing shales of the Georgia section are the type, 

 description is given 4 of the slates and shales, and it is stated the forma- 

 tions of the Upper Taconic have a thickness of 14,000 feet. In thes< 

 the Olenellus fauna occurs more or less abundantly at various horizons 

 An examination of the sections and the fauna of the " Granular Quartz 1 

 and "Taconic" shalesand slates, shows that the former is stratigraphicall; 

 and faunally the equivalent of the upper part of the latter ; while th( 

 " Granular Quartz " is a sandy deposit of the shore line, and the shales an< 

 slates the offshore accumulation of sediments. On the map accom- 

 panying this paper the geographic distribution of the "Granular Quartz,' 

 the "Red sandrock" of Vermont, and the Georgia slates and their south- 

 ward extension as the Taconic slates is represented. 



In a tabular view of the American Classification and Nomenclature, 

 published in 1888, by Prof. Jules Marcou, 5 the Taconic system is divided 

 into upper, middle, and lower divisions. In the upper division the 

 Potsdam sandstone, Swanton slates, Phillipsburg and Point Levis for- 

 mations arc included. The middle division includes the Georgia for- 

 mation and the St. John or Paradoxj'des zone, of New Brunswick, of 

 Braintree, Massachusetts, and of St. Mary's Bay, Newfoundland. In 

 the lower division are the Chuar and Grand Canon formations of the 

 Grand Canon, Arizona, the sandstones of Great Bell Island, and the 

 slates of St. John's, Newfoundland. The confusion in this table is not 



1 Fauua of the "Upper Taconic" of Emmons, in Washington County, New York. Am. Jour. S<i, 3d 

 ser., vol. 34, 1887, pp. 187-199. 



2 Discovery of fossils in the Lower Taconic of Emmons. Aiu. Assoc, Proc, vol. 36, 188*, pp. -12, 213. 



3 The Taconic System of Emmons ;>nd the use of the name Taconic in geologic nomenclature Am. 

 Jour. Sci., 3d aeries, vol. 35, 1888, pp.229 242, 307-327, 394-401. 



4 Op.cit,pp. 241, 242. 



* Aniericau Geological Ulassilic.itiou and Nomenclature. Camhridge, 1888, p. 7* 



