On Jurassic and Cretaceous fossils from North-East Greenland. 44") 



Pecten Broenlundi and Tancredia Jarueri; both of these species as 

 well as the other species determinable with a lair amount of certainty 

 are known from the northernmost sandstone region on Store Kolde- 

 wey. There can thus he no doubt, that the yellow and red sand- 

 stones on Hochstetter's Foreland and the gray sandstone farthest lo 

 the north on Store Koldewey belong to the same age. 



c. Portlandian. 



In the district round Danmarks Havn, especially in the pass (Vester- 

 dalen) which separates the so-called Harefjseld from the remaining 

 part of the district, a number of sedimentary boulders were found 

 which must have been brought down by the land-ice at a time, 

 when the latter had a much greater extension than it has now. 

 Where these boulders come from, is not known, as no trace what- 

 soever of fixed sedimentary masses has been found in the immediate 

 neighbourhood. They have presumably been brought down from the 

 north, as the ice seems to have come from this quarter, and it is 

 possible, that a portion of them has come from the sedimentary 

 deposits at Jokel Bay, which contain a quantity of badly preserved 

 fossil plants, whose age still remains undecided. The boulders proved 

 to be very different, both as regards their petrographic character 

 and their fossil contents; we can distinguish between sandstones 

 containing mainly Portlandian fossils and calcareous concretions with 

 the remains of a Xeocom fauna. The former greatly resemble in 

 appearance the sandstone from the northernmost of the 3 sandstone 

 regions on Store Koldewey Island, as they are gray in colour and 

 contain a quantity of calcium-carbonate and numerous Hakes of mica. 

 But the fauna is quite different. As the fauna list shows, Dentaliam 

 nodulosum is the only species, which is common to these boulders 

 and the Alternans-strata on Store Koldewey. Of much more im- 

 portance, however, is the occurrence of Aucella tenuistriata Lah. and 

 A. mosqaensis v. Bic.n, the first of which goes from the Sequanian lo 

 the Lower Portland, whilst the last-mentioned may well be considered 

 as a species characteristic of the Portland. In any case a portion of 

 tbese boulders must therefore be referred to the Portlandian. Bui 

 we also find here a by no means small number of specimens of an 

 Aucella, which seems to be very nearly related to A. reticulata, a 

 species found on Spitzbergen in deposits, which according lo Pom- 

 PECKJ must be referred to the Sequanian-Kimmeridgian, thus in layers 

 which are of the same age as the Alternans-strata on Store Koldewey 

 and on Hochstetter's Foreland. It is probable, therefore, that a por- 

 tion of the boulders mentioned come from Alternans-strata, which 



