AND THE REPORT ON THE GEOLOGY OF VERMONT. 125 



from the "Thirteenth Animal Eei^ort Regents' University, New York, 18G1 (not 186 0) 

 is here reprinted Irom p. 367 to 372, under the title: "Note njwn the Trilobites of the 

 shales of the Ilndson River group in the town of Georgia, Vermont." But the last 

 Ijhrase before the final note is omitted. Per contra, a description of a Oraptolithus 

 Milesi by Professor Hall is added at p. 372. 



At the end of the Georgia group, p. 386, there is a Note by Edward Hitchcock ex- 

 jiressing his doubt about Barrande's remarks in his " Documents ancicns et nonveaux, sur 

 la faune Primordiale et le systemc Taconique en Amei'ique." According to Hitchcock, 

 Logan has suggested that "these shales and limestones (of Quebec and Georgia) are 

 subordinate to the Potsdam sandstone" — " a deep sea deposit, going on at the same time 

 with the arenaceous deposit near the shore; whereas Professor Eminons places his Ta- 

 conic system hdow the Potsdam sandstone, in the same position as the Cambi'ian and 

 Huronian system. Does he then recognize the Taconic system as understood by its au- 

 thor, or can it be that Barrande has mistaken his meaning?" 



In the geological map of Vermont, at the end of Vol. ii, Plate i, Messrs. Hitchcock, 

 in the explanation of the colors, place the Georgia slates above the Champlain system 

 (Cambrian), in the U^jpcr Silurian! 



Prof. C. H. Hitchcock on the " age of Taconic rocks," in a letter to Mr. J. D. Dana, 

 dated February 10, 1880, and published in the Amer. Journ. Sc, 3d series, Vol. xrx, pp. 

 236 and 237, sa3fs that " there is nothing in the report (on the Geology of Vermont) 

 anywhere favorable to the Taconism." . . . "Within the past two years I have gone 

 over most of the Vermont sections, and have felt that they demonstrated the essential 

 equivalence of the Taconic system with the Potsdam and the overlying limestones and 

 shales (of the Lower Silurian). I have been throughout inessential accord with you and 

 Mr. Wing." 



1862 (May). In Vol. in, Palaeontology of New YorJc, Part i. Text, Albany, antedated 

 1859, but not distributed until the end of May, 1862, at p. 525, the paper of the Tivelftk 

 Ann. Rep. Regents' Univ. New Yorh, by James Hall, is reprinted, with the altered title 

 of: " Remarks upon the Trilobites of the shales of the Hudson River group, Avith de- 

 scription of some new species of the genus Olenus," instead of, " Trilobites of the shales 

 of the Hudson River group," making a fourth variation in the title of that small paper, 

 in less than three years. 



In the American Journ. 8c., January, 1861, p. 123, we I'ead: "The Introduction (of 

 Vol. Ill, Palaeontology of Neio Yorli) handles with mastei'ly skill the diflicult subjects 

 connected with the proper classification of the lower horizons of life in our planet. A 

 review of this important chaj^ter with i-eference to the views of Barrande will probably 

 appear in our next." That review has never apjieared to this day; and the introduction 

 rej^eats at p. 14, the statement: "From the metamorphic slates of this group (the Hud- 

 son River group) on the western slope of the Green Mountains in Vermont, we have 

 three or more species of trilobites, which are of much interest, being representative of a 

 genus, but little known in this country," together with the authoritative note, containing 

 "the testimony of Sir W. E. Logan;" and i-epeated verhatint at the end of the volume, 

 p. 529, we have the whole " proper classification of the lower horizons of life " as under- 

 stood and maintained by the paleontologist of the state of New York. 



1862 (Aug.). In a printed "Letter to M. Joachim Barrande, on the Taconic rocks of 



