HAKDISTON QUAKTZITK 151 



test8 have been removed by solution during the process oT weathering. 

 A careful search in the fresh, unaflected portion of the rock failed to 

 disclose any sign of fossil remains. That they are really present in 

 abundance, however, is shown by the frequency of their occurrence in 

 the w'eathered portions. We have found no fossils in the vitreous 

 quartzites nor in the arkose beds. 



PREVIOUS VIEWS 



Professor Rogers * observed this formation at a few localities and called 

 it number 1 of the Lower Secondar}- or Appalachian rocks. 



Professor George H. Cooky correlated it with the Potsdam sandstone of 

 New York on the basis of its position beneath the great limestone for- 

 mation, all of which was believed to be the equivalent of the Calciferous 

 sandstone of New York. 



In 1890 F. L. Nason, in a paper presented to the Geological Society 

 of America, announced the discovery by himself and Doctor Beecher of 

 Lower Cambrian fossils in this quartzite. 



Doctor Foerste X in 1893 added to the localities at which Cambrian 

 fossils had been found and showed that the quartzite bed was more 

 continuous than had been previously supposed. 



C. D. Walcott§ has shown that "the basal sandstones of Alabama, 

 Tennessee, and Virginia (ChilhoAvee quartzite) ; Maryland, Pennsylva- 

 nia, and New Jersey (the Reading quartzite) ; New York and Vermont 

 (Bennington quartzite), were all deposited in Lower Cambrian time." 



Wolf and Brooks || described the formation as it occurs near Franklin 

 Furnace, New Jersey, and applied to it the geographical name " Hardis- 

 tonville." 



KiTTATINNY LiMESTONE 

 S TEA TIGRA PHIC A ND MA CROSCOPIC CHA RA CTERS 



Above the Hardiston quartzite and lying conformably on it is a great 

 thickness of limestone, mostly dolomitic and unfossiliferous. Nearly all 

 the limestone of both the Kittatinny valley and the allied highland 

 valleys is included in this formation. It is somewhat variable in texture, 

 bedding, and color, but these variations are not sufficiently constant to 

 afford a basis of further subdivision. The color is usually blue or gray. 

 Sometimes it is nearly black, and in places it has a pinkish tinge. Much 

 of the formation occurs in massive beds, occasionally 3 or 4 feet thick. 



* Description of the Geology of New Jersey, being a final report, Phiia., 1840, pp. 45-47, 



+ Geology of New Jersey, 1868, p. 72. 



X Foerste : Am. Jour. Sci., :id series, vol. xlvi, 1893, pp. 435-444. 



I Wnlcott : Bulletin 1.34, U. S. Geol. Survey, 1896, p. 3:}. 



II Wolf and Brooks, loc. eit. 



