AND THE REPORT ON THE GEOLOGY OF VERMONT. 



121 



Page 339: ^' Conoceplialus (at Ilighgate, directly east of the house of J. Church). 

 The foi-m known to me most nearly like this one is in the Clinton group of this state, 

 IS^ew York (from Prof. J. Hall). With a shell resembling Atrypa hemispherica of the 

 Clinton group of New York." 



Page 357 : " Georgia group. Upper Hudson River group : Elementary Geology, 31st 

 edition, p. 411, by Ed. and C. H. Hitchcock, 1860." 



Page 371: " Georgia slate. Its fossils rank it as Lower Silurian (Second Fauna) rather 

 than Cambrian (First Fauna) ." " The stratigraphical view of the Georgia slate which 

 has been so ably defended by Professor Hall (James) seems to demand for it a place 

 either above or equivalent to the Oneida conglomerate." 



Page 375 : " The natural inference from these relations is that the red sandrock is of 

 the age of the Oneida conglomerate or Medina sandstone and the Georgia slate is still 

 newei- and therefore Middle Silurian." 



Page 393 : "Talcose conglomerate ... is newer than the Georgia slate." 



Pages 391 and 421 : " Eolian limestone . . or Stoekbridge limestone . . may be as re- 

 cent as the carboniferous rocks." " In the middle of the limestone fossils which, though 

 obscure fi'om metamorpliism, are clearly referable to genera characteristic of Devonian 

 rocks." 



Pages 424 and 433: " Talcoid schists are newer than the Eolian limestone." 



Page 434 : '' The Taconic system." Mr. Hitchcock claims that the outline of its method 

 and explanation represents Prof. Emmons' ideas " as faithfully as though we were the 

 amanuensis of an advocate of the Taconic system." This " brief view of its history as a 

 system " is full of reticence and even opposition, and is simply an ex parte and partial 

 exposition, according to Hitchcock's understanding of the Taconic sj^stem. 



The " Geological map of Vermont traced out and compiled by the members of the 

 Geological Survey," 1861, scale of miles 4o^o!o o o ? '^^ placed at the end of the second vol- 

 ume, as Plate i. 



" Explanation of the colors." In ascending order. 



Granite, syenite and protogine. 



Gneiss. 



Hornblende schist. 



Serjientine. 



Talcose schist. 



Calciferous mica schist. 



Clay slate. 



Potsdam sandstone. 

 Calciferous sandrock. 

 Chazy, Birdseye and Black 



Kiver limestones. 

 Trenton limestone. 

 Utica slate. 

 Hudson River slates. 

 Hudson River limestones. 



MBMOIKS BOSTON SOC. NAT. HIST., VOL. IV. 



- Azoic. 



Lower 

 Silurian. 



Oneida conglomerate (red 



sandrock.) 

 Quartz rock. 

 Georgia slates. 

 Talcose cono^lomerate. 



Upper ' 

 Silurian. 



Eolian limestone. 



Talcoid schist. 



Beds of limestone in tal- I Mostly 

 coid schist. Devonian. 



Upper Helderberg lime- 

 stone. 



Pliocene tertiary. 

 Gold in alluvium, etc. 



