■*^ JOHAN KI^R. [sec. ARCT. EXP. FEA 



M 



As is known, Osteolepis also belongs to the typical Middle Devonian 

 series of Old Red; as however the determination is somewhat nnceitain, 

 no great stress can be placed upon it. 



In my opinion the knowledge conveyed in the above 

 indicates that the fish horizon at Skrap Valley cannot be 

 parallelled with Chenuing but is of older Upper Devonian 

 age. As this horizon, accoi'ding to Per Schei is situated in 

 the middle of Series E, we must assume that this series 

 with its continental facies commenced in the lowest part of 

 Upper Devonian. 



The higher fossiliferons horizons in Series E give less definite 

 indications of Upper Devonion age. The horizon in Bregnekleften too, 

 with its abundance of plant remains, which according to Per Schei is 

 contemporary with the dark schists of Galgeodden, wilh Bothriolepis, 

 cf. hydrophila Ac. and Glyptolepis, gives us in NaTHORST's opinion 

 no very definite determinalion of age. 



It is therefore not possible to delermine wilh exactitude how high 

 up in the Upper Devonian Series E goes. It is very probable that Ibis 

 continental pei'iod lasted there until the end of the Devonian age, and 

 possibly even until the Lower Carboniferous. 



Unforlunately Per Schei had no opportunity of closely examining 

 the profiles which beyond question are the decisive factor in this problem, 

 \iz. the pi-ofiles northwards lo Great Bear Cape, where the abundant 

 marine carboniferous fauna were (lisco\ered. 



Zoogeographical Conditions. 



The fauna of Series E is also interesting in another respect, for 

 most of its elements are found to be more closely related to European 

 forms then to forms previously known from America^. 



The genus Psammostens is (bus completely unknown in North 

 Ameiican Devonian deposits, both marine and continental. On the olher 

 hand it is very common in N. W. Russia and has also been found in 

 N. Scotland and on Spitzbergen. 



The determinable and small Bothriolepis differs from known American 

 species, but is identical with or at least very nearly I'elated to B. 

 hydrophila Ag. from Scotland. 



1 Vide in particular: A. Smith Woodward, Catalogue of Foss. Fislics in tlic British 

 Museum. II. 

 Cu. R. Eastman, Dev. Fislies of Iowa. Faunal Lists, Page 275. 



