in the European Arctic Region. 



3Jr7 



In a short article on Paleogeography, written in Nor- 

 wegian/ I mentioned as a probable supposition that the 

 Scandinavian Middle and Upper Cambrian alum shales 

 with their high content of bituminous and carbonaceous 

 matter were deposited in a relatively closed basin, with 

 no open connection into the Arctic Ocean. With the dis- 

 covery in Novaya Zemlya of the fossils here discussed, I 

 think this supposition has been considerably strength- 



Fig. 2. 



Fig. 2. — Map showing distribution of Upper Cambrian seas; vertical 

 lines mean " Pacific"; horizontal ones "Atlantic" faunal realms. Ameri- 

 can conditions after Schuchert 1915. Kings mark occurrence of Huenella. 



ened, since we must now assume a land barrier and not an 

 open connection between the Novaya Zemlya sea and the 

 Scandinavian one. We do not observe, in the Upper 

 Cambrian faunas of Scandinavia, any marked difference 

 when we pass from Scania northward into Jamtland, 

 which is halfway the total length of the peninsula. 



In the map, hg. 2, I have marked the known areas of 

 Upper Cambrian seas, with an indication of the probable 



1 Xaturen, p. 81, 1919. 



Am. Jour. Sci. — Fifth Series. Vol. Ill, No. 17. —May, 1922. 



