276 THE CAMBRIAN. [bull. 81. 



of a light gray color, in layers varying from a few inches to 2 or 3 feet 

 and even up to 6 feet in thickness, on the spurs to the north of Clarks- 

 burgh Mountain. In the town of Bennington, a few miles further 

 north, the writer measured a section of the quartzite 400 feet in thick- 

 ness. It is formed largely of light gray, nearly white, compact, fine 

 grained, and massive bedded quartzite, with alternating beds of hyaline 

 quartz. At this locality fossils other than the Scolithus borings, which 

 were known to occur at a number of localities in Vermont, were found 

 in 1887 for the first time in situ in the quartzite. The species belong 

 to the genera ISothozoe, Hyolithes, and Olenellus. Traces of a trilo- 

 bite, apparently of the genus Olenellus, were also found 100 feet above 

 the gneiss on the western summit of Clarksburg Mountain. In the 

 bowlders on the line of the outcrop of quartz, to the north of Benning- 

 ton, traces of fossils have long been known, among which are Nothozoe 

 vermontana, Hyolithes communis, and Olenellus thompsoni. 



Prof. J. D. Dana describes the quartzite in its extension into western 

 Massachusetts, western Connecticut, and eastern New York. It varies 

 very little from the characteristic features shown* at the north, and 

 from its disturbed condition no sections were obtained of its entire 

 thickness. At Stissing Mountain, in Dutchess County, New York, it 

 rests upon the Archean, and is a massive bedded, compact quartzite, 

 in which the genus Olenellus and Camerella minor have been found. It 

 here passes above into a limestone in which Hyolithellus micans^ a char- 

 acteristic Lower Cambrian species, occurs. 1 



In a paper read before the Geological Society of America at its sec- 

 ond annual meeting, December 30, 1890, Dr. J. E. Wolff gave au ac- 

 count of the discovery, by Mr. A. F. Foerste and himself, of fossils of 

 Lower Cambrian age in the limestones of the East Rutland Valley. 

 The limestones rest conformably upon the quartzite which carries 

 Olenellus in Bennington County. Dr. Wolff identified the species as 

 Ktitorgina sp. ? and Salterella. 2 The evidence of the Lower Cambrian 

 age of the limestones is not fully proved, as the two genera may range 

 up into the Middle Cambrian. 



He mentioned that in the West Rutland Valley, and in the valley 

 between the West Rutland and East Rutland Valleys, the limestones 

 contain fossils of Calciferous Chazy-Trenton age, or those which will 

 be found above the Cambrian horizon. From his section it is probable 

 that the Middle and Upper Cambrian faunas will be found to range up 

 into the limestones beneath the Calciferous horizon, as has been dis- 

 covered by Prof. W. B. Dwight in Dutchess County, New York, and 

 Prof. Frauk Nason, in Sussex County, New Jersey. 



As a whole, the " Granular Quartz" may be said to consist of ashore 

 deposit accumulated along the western shore of the Green Mountains 



1 The Taconic system of Emmons and the use of the name Taconic in Geologic nomenclature. Am. 

 Jour. Sci., 3d ser., vol. 35, 1888, p. 236. 



2 Bull. Geol. Soc. Am., vol. 2, 1891, pp. 334, 335. 



