372 



CHARLES S. PROSSER 



have been identified and described in Nevada ; the dolomite of Mani- 

 toba contains the European species Stringocephalus hurtini; Spirifer 

 mucronatus has been found upon the banks of the Albany River 

 south of Hudson Bay; the fauna of the Hamilton shales occurs in 

 the Mackenzie Valley from the Clear Water River to the Arctic Ocean; 

 while it is also reported from the Porcupine River, a western tributary 

 of the Yukon in Alaska, and perhaps also on Kouiou Island, in the 

 southern part of that territory. In South America, in Brazil, in the 

 province of Para, in the Erere district, are beds which Katzer refers 

 to the base of the Middle Devonian, and Dr. J. M. Clarke has stated 

 regarding the fauna of the Erere sandstone that it 



is remarkably free from species or representatives of subgeneric groups pre- 

 vailing elsewhere in early Devonian faunas, and equally devoid of types which 

 elsewhere pass upward into the later faunas; in other words, it is, with all its 

 resemblance to the Hamilton, a more typical and better-defmed Middle Devonian 

 faima than that;^ 



while Dr. Freeh reports Middle Devonian in Bolivia and Cleland 

 from the Jachel River in Central Argentina.^ On the eastern conti- 

 nent Middle Devonian rocks occur in England in northern and south- 

 ern Devonshire, in northern France and southern Belgium, in the 

 region of the Vosges, in the Central Plateau and the Montagne-Noire 

 of France, and in the Pyrenees and Spain. In central and eastern 

 Europe they occur in the Eifel, Rheinland (Nassau), Hartz, Thur- 

 ingia, Bohemia, Galicia, Russian Poland, the Carnic Alps, and on 

 the Bosporus. These rocks also cover a large area of eastern Russia 

 and the western slope of the Urals, extending to the border of Fin- 

 land on the north. In Asia Middle Devonian rocks occur in Siberia, 

 China, and on the south side of the Tian-Shan Mountains in Central 

 Asia. In Australasia they are found in New South Wales, Victoria, 

 and Tasmania; and they also probably occur in Africa.^ 



Charles S. Prosser. 



Ohio State University, 

 Columbus, Ohio, July, 1Q04. 



I Archives do Museu Nacional do Rio de Janeiro. Vol. X (1899); author's English 

 edition (1900), p. 90. 



^Bulletin No. 206, U. S. Geological Survey, (1903) p. 19. 



3 For this account of the distribution of the Mesodevonian the writer is largely 

 indebted to DE Lapparent's Traite de geologic, Frech's Lethaea palaeozoica, and 

 Kayser's Lehrbuch der geologischen Formationskunde. 



