Maryland Geological Survey 27 



Later Prof. Schuchert reviewed the works on the " Geology of the 

 lower Amazon region " and stated that the Erere fauna " seems to hold 

 the horizon of the American Onondaga, hardly that of the Hamilton, and 

 certainly there is nothing in it that indicates the Genesee fauna." ' 



Dr. Steinmann reported Middle Devonian from Bolivia, east of Lake 

 Titicaca,^ which is also accepted by Dr. Freeh, and Prof. Cleland from 

 the Jachel Eiver in Central Argentina.^ 



On the Eastern Continent Middle Devonian rocks occur in England in 

 northern and southern Devonshire, in northern France and southern 

 Belgium, in the region of the Vosges, the Central Plateau and t'.e 

 Montagne-N'oire of France, in the Pyrenees and Spain. In central and 

 eastern Europe they occur in the Eifel, Eheinland (Nassau), Hartz, 

 Thuringia, Bohemia, Galicia, Eussian Poland, the Carnic Alps and on the 

 Bosphorus. These rocks also cover a large area of eastern Eussia and the 

 western slope of the Urals extending to the border of Finland on the 

 north. In Asia Middle Devonian rocks occur in Armenia, Siberia, China 

 and on the south side of the Tian-Shan Mountains in Central Asia. In 

 Australasia in New South Wales, Victoria and Tasmania and al*o in 

 Africa in the Sahara.* 



European Equivalents 



The early attempts at correlating the Devonian rocks of the United 

 States with those of Europe dealt only with the formations found in Xew 

 York which in fact has generally been the custom down to the present 

 time. In 1842 Conrad published the statement that " the Ithaca group, 

 Chemung group, and the Old Eed Sandstone near Blossburg, in Peunsyl- 



'■ Jour. Geol., Vol. XIV, 1906, p. 738. Also see p. 734 where Schuchert states 

 that " while he would refer it [the Erere fauna] to a liorlzon about that of the 

 Onondaga (Corniferous), he holds that it has no close faunistic relationship 

 with it." 



='Am. Nat., Vol. 25, p. 856. 



'BulL U. S. Geol. Surv., No. 206, 1903, p. 19. 



* For this account of the distribution of the Middle Devonian the writer is 

 largely indebted to de Lapparent's Traite de Geologie, Freeh's Lethaea palaeo- 

 zoica and Kayser's Lehrbuch der geologischen Formationskunde. 



