122 JULES MARCOU ON THE TACONIC OF GEORGIA 



The map had two editions. The first one, distributed in December, 1861, contains the 

 name Oneida Conglomerate inscribed instead of Red Sandrock; and the rocks are united 

 by great gronps or systems, by means of brackets inider the general names of Azoic, 

 Lower Sihirian, Upper Sihirian, and mostly Devonian. In the second edition accompany- 

 ing the volumes, those brackets and general names are half defaced, as well as the name 

 Oneida conglomerate. But on almost all the copies attached to the work, the erasures 

 have been done so impei-fectly, that it is easy to read those names and to see the brackets. 



YI. Historic classification and use of the name Georgia; with some paleon- 



TOLOGICAL remarks, AND SOME NOTES ON THE GrAPTOLITE ZONES IN AMERICA. 



Now we can give in true chronological order the history of the Georgia formation, 

 with the exact dates of publication. 



1855. Mr. J^oah E. Parker, a farmer in West Georgia, in quarrying large slates 



for a floor, found some trilobites. He showed them to the schoolmaster of the village, 

 who wrote at once to the state geologist of Yermont, the late Zadock Thomjison of 

 Burlington. Thompson came directly, visited the quarry, but died in January, 1856, 

 without publishing anything about the discovery and the geology of Georgia. How- 

 ever, before his death, he jjlaced the specimens of trilobites in the hands of Mr. James 

 Hall, with the request to pubhsh them. I would remark that, in 1856, the primordial 

 fauna of Barrande had been established for ten years, and several works and pamphlets 

 had been published on the subject in Paris, in Bohemia and in Scandinavia, not to speak 

 of the Taconic system with a special fauna recognized at first sight by Barrande as 

 jirimordial, as soon as he saw Emmons' work. TavcIvc years had passed away since 1844, 

 and the paleontologist of I^ew York entirely ignored the primordial fauna, its strati- 

 graphical position, its meaning, and the Taconic system. 



1859. Mr. James Hall, in " Twelfth Annual Eeport, Regents of the University of 



the state of New York, " page 53, Albany, 1859, calls the shales in the town of Georgia, 

 shales of the Hudson River group, and at page 62, he adds that Logan places " the 

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

 a series of sti-ata which he is inclined to rank as a distinct group above the Hudson 

 River proper." Then Prof J. Hall adds " it would be quite superfluous for me to add 

 one word in support of the o]jinion of the most able stratigraphical geologist of the 

 American continent." 



La the article entitled : TriloVdes of the shales of the Hudson River group, Mr. Hall 

 describes and figures the fossils sent to him by Zadock Thompson, under the names of 

 Olenus Thompsoni, 01. Yermontana and Peltura (Olenus) holojn/ga. 



1860 (Mar.). "Mr. C. H. Hitchcock exhibited a geological map of Yermont and ex- 

 plained the principal features of the complicated geology of that state." "The two most 

 interesting points in this connection were, that there is wo foundation for what Mr. 

 JSmmons called his Taconic system (a mixture of the Silurian and Devonian), and that 

 the Dorset limestone (his Stockl)ridge limestone) is newer than the Lower Silurian, and 

 is probably Upper Silurian or Devonian." (See Proceed. Boston Soc. Xut. Hiftonj, Yol. 

 VII, pp. 236, 239, Meeting of March 7, 1860.) At the same meeting Pi-of AV. B. Rogers 



