WALcuiT.] GEORGIA SLATES. 99 



slate" and " Taconic sandstone," 1 gives a description of the slates and 

 interbedded sandstone with considerable detail. He thinks that they 

 may belong to an older system than the New York rocks, but no evi- 

 dence is given to support this view. On page 865, Dr. Fitch states that 

 in the summer of 1844 he found at Reynold's Inn the first fossils known 

 from the Tasonic slate, and sent them to Dr. Emmons, who named and 

 published illustrations of two species. Dr. Fitch also describes an 

 annelid trail, Helminthoidichnites tenuis, from the "Taconic slate" of 

 Granville. 2 



Dr. C. B. Adams, of the Geological Survey of Vermont, called the 

 northward extensiou of the Upper Taconic slate (of Emmous) of Wash- 

 ington and Rensselaer Counties, the roofing slates of the Taconic system, 

 and included them in his Hudson River group. 3 



The fossils described from a locality of this horizon, near Troy, New 

 York, in the paleontology of New York, 4 were included by Prof. James 

 Hall with those of the Hudson River group and were considered to be 

 of that age. This same view was taken by him of the northward ex- 

 tension of this series in Vermont, when he described the trilobites from 

 the shales of Georgia in 1859. At the close of this article he says: 5 



In addition to the evidence heretofore possessed regarding the po&ition of the shales 

 containing the trilobites, I have the testimony of Sir W. E. Logan that the shales 

 of this locality are in the upper part of the Hudson River group, or forming a part 

 of the series of strata which he is inclined to rank as a distinct group above the Hud- 

 sou River proper. It would be quite superfluous for me to add one word in support 

 of the opinion of the most able stratigraphical geologist of the American continent. 



Prof. 0. H. Hitchcock, 6 in speaking of the trilobite rock of Vermont, 

 from which Prof. Hall's specimens were obtained, stated that he con- 

 sidered them as overlying the equivalent of the Oneida, which was 

 superjacent to the Hudson River Rocks. 



The attention of M. Joachim Barrande having been called to the 

 fossils found in the Georgia slate, he studied them with great care, and 

 published an extended review of the literature referring to tbem, and 

 discussed the paleoutologic proof of the age of the rocks. 7 He decided 

 that the fauna was equivalent to his Primordial fauna of central Bo- 

 hemia, and that it could not be referred to the Second fauna, as had been 

 done by the American observers. Under the impression that Dr. Em- 



1 A Historical, Topographical, and Agricultural Survey of the County of Washington. Trans. W. Y. 

 State Agric. Soc. for 1849, 1850, pp. 830-857. 



*Op.cit,p.868. 



1 First Annual Report on the Geology of the State oi Vermont, Burlington, 1845, p. 61. On the 

 Taconic Rocks, Am. Jour. Sci., 2d series, vol. 5. 1848, pp. 108-110. 



4 Paleontology of New York, vol. 1, containing descriptions of the organic remains of the lower di- 

 vision of the New York system, 1847, pp. 252, 256, 257. 



6 Remarks upon the trilobites of the shales of the Hudson River group. Paleontology of New 

 York, vol. 3, supplement to vol. 1, 1859, p. 529. 



• On the geology of Vermont, chiefly in connection with the Taconic System. Boston Soc. Nat. Hist. 

 , voL 7, 1861, pp. 426, 427. 



: I)<>cuments anciens et nouveaux sur la faune primordiale et le systeme taconique en Amerique, 

 Soc. geol. France, Bull., 2 C aer., vol. 18, 1861, pp. 203-321. 



