300 



be taken up by Danish naturalists, namely: a minute unswerving 

 investigation of the raised beaches in West-Greenland, especi- 

 ally of the area around the Disco-Bay. ff such a problem, however, 

 is to be solved in the right way, it will be necessary to chose 

 the right men: a geologist beforehand acquainted with quaternary 

 deposits, and a zoologist who has made the biology of the 

 northern molluscs an object of special study; a man qualified 

 in both directions may possibly be found. 



Raised beaches with fossil molluscs also occur in East- 

 Greenland, in its northern part. They appear abundantly in 

 the area around the Scoresby-Sound according to investigations 

 undertaken by the Danish expeditions of 1891 — 92 ^) and 1900. 

 They also occur at Forsblad-Fjord, Sophia-Sound and at Franz 

 Joseph-Fjord where they were discovered by the Swedish ex- 

 pedition in 1899. 



Prof. A. G. Nathorst is the first who has shown that 

 also in that part of Greenland may be found evidences that 

 milder climatic conditions than the present ones have ruled here 

 during a period of the quaternary time. He writes as follows-): 

 «The locality at the mouth of Sophia-Sound south-west of Ro- 

 bertson-Island is of interest because even Mytilus edulis occurs 

 there as fossil. Yet this species was not seen at more than 26 

 meters above the sea-level while other bivalves were found up to 

 a height of 51 meters. . . . The occurrence o^ Mytilus in a fossil 

 state here is of great interest, as it has not been found living north 

 of 66° N. ^) and has, strange enough, not been stated as fossil 

 from Scoresby-Sound. Another occurrence of the same bivalve 

 however is still more peculiar. Du sen noticed it namely in- 



Den østgrønlandske Expedition, udført i Aarene 1891 — 92 under Ledelse 



af С. Ryder. Geologi ved Edv. Bay. Medd. om Grønland, XIX, 189.5 



(p. 171 — 176). 



A. G. Nathorst: Bidrag till nordöstra Grönlands geologi. Geol. Foren. 



Forhandl. Bd. 23, 1901 (p. 304). 



Later on it has however by C. Kruuse been found to occur as far 



north as ca. 66° 30' N., comp, this treatise p. 32.5. 



