624 Ad. s. Jensen. 



conditions have also prevailed for the deposit of clay in somewhat 

 larger formation than the normal ; Yoldia shells are here of fairly 

 frequent occurrence. Besides these large continuous tracts of clay, 

 smaller patches are found in several places on Hvalsletten, at times 

 of quite pygmean dimensions, some few metres square. These have 

 been formed in shelter, close to sharply rising ground, as for instance 

 beside the so-called "Bastion". 



Altogether an exception, both as regards thickness (some 5 metres) 

 and extent, and also level, is the tract of clay above the Jurassic plateau 

 of Koldewey Island. Presumably, the high western portion of the 

 island has here played the same part as the "Bastion" of Hvalsletten 

 on a smaller scale, the quiet water in a sheltered corner behind these 

 rocks offering opportunity for formation of the deposit. Its altitude, 

 about 125 metres above sea level, is likewise unique. True, there 

 are numerous evidences of sea action over the whole investigated 

 region, even up to far greater heights, but quaternary fossils are 

 otherwise only found in the lower parts, and for the most part in 

 the very lowest. The peculiarity may be due to the fact that the 

 fossils were preserved in the clay and thus better able to withstand 

 the effects of weather than shells in the altogether superficial sand 

 formations; other conditions have, however, probably contributed, 

 and I hope in another publication to offer some further observations 

 on this point." 



I. Island in Bessels Fjord, 

 ca. 76° N. lat. ca. 20° W. long. 



Raised sea bottom, — 10 m above sea level. 23.5.1908. 

 Saxicaua arctica L. 



5 shells, up to 37 mm. Of an elongated arc//ca-form. 



II. Great Koldewey Island, 



76°10' N. lat. 18°35' W. long. 

 From clay above the Jura-deposits, 120 m above sea 



level. 3.6.1907. 



Nucula sp. 



Yoldia fPortlandiaJ arctica Gray. 



3 spec, 15, 155 and 165 mm. The shells in several places broken 

 off, leaving the stone core more or less exposed ; on one of the 

 shells, the finely undulating structure characteristic of the species 

 is still preserved. 



