20 Notes, Reviews and Comments. 



NOTES, REVIEWS, AND COMMENTS. 



Geology. Ells, R. W., L L.D., F.R.S.C " The Potsdam and 



Calci/ercus formations of Quebec and Eastern Ontario." Advance 

 copy and Ex. Trans. Roy. Soc. Canada, Vol. XI., Section IV., 

 pp. 21-30, 1895 (distributed, 12th February 1895.) 



In this paper, the geographical distribution, local characters, 

 palaeontological as well as stratigraphical relations of the Potsdam and 

 Calciferous formations as they are found in Eastern Canada in particu- 

 lar and in Eastern America in general are discussed. Dr. Ells points 

 out also the relations of these two formations to the Levis and Upper 

 Sillery. He correlates the Calciferous with the Levis of the vicinity of 

 Quebec and the Potsdam with the Upper Sillery of the same region. 

 He places all these in the Ordovician system but refers the Lower 

 Sillery to the Cambrian epoch. 



Dr. Ells concludes by staling : " It would appear, therefore, from 

 all the evidence at our disposal, that the real line of division between 

 the Cambrian and the Cambro-Silurian system should be placed at the 

 close of the Georgia slate and Red Sandrock divisions, and that the 

 scries from the base of the typical Potsdam to the summit of the Utica 

 and Hudson River formations should constitute the system known as 

 Cambro-Silurian or Ordovician. 



Ami, H. M. "Notes on Canadian Fossil r\oz<>a." Ex. Can. Rec. 

 Science, Vol. VI., Xo. 4, pp. 222-221), Montreal, January, 1 S95. 



This paper is practically a lesume of Prof. Ulrich's work on the 

 Bryozoa of the Lower Silurian in Minnesota,* in which 

 attention is called to thirty-three species from Canada comprising 

 twenty-one genera. Six additional species of Pryozoa referable to as 

 many genera arc added to the above, but these were described by Prof. 

 Ulrich's in Part II. of the Paleontology of Illinois, Section VI. The 

 localities in Canada from which the species recorded were obtained, 

 the horizon, references and other points of interest regarding these are 

 n in them notes. 



.Ill of Final Rep. Geol. and Nat. 1 1 it . Survey of Minnesota, Mimic 

 apoli 



