walcott.1 NOMENCLATURE. 249 



system by Dr. Murray; and in the classification used in this memoir 

 it is included under the Algonkian, as a pre-Cambrian formation. 

 • In proposing a classification for the formations in the vicinity of St. 

 John, New Brunswick, Mr. F. G. Matthew proposed the term, "St. John 

 group" for several zones of soft black and dark gray, finely laminated 

 shales alternating with zones of coarser grained slates, containing nu- 

 merous thin beds of fine-grained sandstone. 1 The fossils were Liugula, a 

 Conchifer, Annelids, and Ooprolites. This was republished in 1865, and 

 is used in all the latest publications by Mr. Matthew. 



In view of the fact that the term "St. John's" was used for a distinct 

 formation by Prof. Jukes in 1843, it appears best to continue to apply 

 it to these slates of the Algonkian ; and to use the later name "Aca- 

 dian" for the slates at St. John, New Brunswick. 



JOHANNIAN. 



This name is proposed by Mr. G. F. Matthew for a local series of 

 strata in the St. John basin of New Brunswick that occur between the 

 Paradoxides zone, or Division No. 1, and the Upper Cambrian Zone, or 

 Division No. 3, which he calls Breton ian. 2 



GEORGIA. 



The name Georgia was incidentally used by Prof. Jules Marcou in 

 1800, when stating that " Prof. Emmons has always regarded the black 

 slates of Georgia as a part of his Tacouic system." 3 In the following 

 year the name was used in volume 1 of the Geology of Vermont, in the 

 systematic description of a group of formations, the typical one of 

 which is a series of slates and shales above the " Red saudrock" in the 

 town of Georgia, Yermont. There was also included in the group the 

 rooting slate belt of Rutland County, Vermont, that passes into Wash- 

 ington County, New York. A provisional reference was made of a 

 series of clay slates that occur in the central part of the State. 4 A full 

 description of the formations referred to the group is given in the text, 

 and their geographic distribution is delineated on an accompanying 

 map. 



Prof. Jules Marcou advanced the claim that he first used the name 

 Georgia in October, 1800, which was followed in December, 1801, with 

 a full definition of the group. 5 Prof. Hitchcock in reply to this, states 



1 Matthew, G. F. : Observations on the geology of St. John County, New Brunswick. Canadian 

 Nat. vol. 8, 1863, p. 244. 



'Illustrations of the fauna of the St. John Group No. 5. Trans. Roy. Soc. of Canada, vol. 8, 1891, 

 p. 129. 



3 On the Primordial Fauna and the Taconio System, hy Joachim Barrande, with additional notes by 

 Jules Marcou, Proc. Boston Soc. Nat. Hist., vol. 7, 1860, p. 375. 



4 Hitchcock, C H. Geology of Vermont, vol. 1, p. 357. 



6 TheTaconic of Georgia and the Report on the Geology of Vermont. Memoirs Boston Soc. Nat. 

 Hist., vol. 4, 1888, pp. 123, 124. 



