348 0. Iloltedahl — Upper Cambrian Fauna. 



trend of the dividing land in the Arctic region as it 

 appears to me. With what we knew before, it is now 

 evident that, as regards the distribution of the two pre- 

 sumably separated oceanic realms, we are dealing here 

 with phenomena of a rather general and not a casual char- 

 acter. I might recall that in another Arctic region just 

 north of the coast of the European mainland, that is, Bear 

 Island (between Norway and Spitzbergen) , both the 

 Lower and Middle Ordovician strata have an American 

 and not a European fauna. 2 



For the probable paleogeography of these younger times 

 I may refer to a recent article in this Journal. 3 



University of Kristiania, February, 1922. 



2 See 0. Holtedahl, Notes on the Ordovician fossils from Bear Island col- 

 lected during the Swedish expeditions of 1898 and 1899, and On the Paleozoic 

 series of Bear Island, especially on the Heclahook system, both papers 

 printed in the Norsk geologisk Tidsskrift, 5, 1918-1919. 



3 O. Holtedahl, Paleogeography and diastrophism in the Atlantic-Arctic 

 region during Paleozoic time. This Journal (4), 19, 1, 1920. I will again 

 take the opportunity to correct the bad error which was made during the 

 printing of this aricle. The maps illustrating Upper Devonian and Upper 

 Carboniferous time should be exchanged. 



