42 ARKIV FÖR BOTANIK. BAND 13. N:0 7. 



WALL have been described byBARTHOHN^ who states that 

 the flora may be regarded as a mixed flora containing ele- 

 ments both from the Rhaetic and the Oolite and finally some 

 that point in a direction towards the Wealden. The older 

 elements, however, are much more numerous than in the 

 flora of Kurremölla, and the relations to the Wealden are 

 fairly insignificant. The only form that is identical or closely 

 comparable with one from Kurremölla is a specimen figured 

 — as it would appear with good reason — under the name 

 of Sagenopteris Mantelli Dunk.? ? There can thus not be 

 stated to exist any close relation between the Kurremölla 

 flora and that from Holsterhus. 



There are some facts, however, which seem to indicate 

 that the Wealden of northern Germany extends further to- 

 wards the north-east than is generally acknowledged. Numer- 

 ous erratic boulders which, on the basis of both included 

 invertebrate fossils and the lithological character, have been 

 compared with the rocks of the Wealden formation proper, 

 have been found far outside the area of occurrence in situ 

 of that formation. They are known from the coasts of 

 Holstein, Mecklenburg and Pommern and even from Scania 

 and the Danish Isles. ^ Grönwall^ has pointed out that 

 the distribution of these boulders would seem to point to an 

 origin of the same from the area between Scania, Bornholm 

 and Rügen, With all due allowance for the fact that the 

 determination of the/ geological age of these boulders is not 

 definitely settled, it appears thus probable that the Wealden 

 occurs in the basin of the Baltic not very far from the 

 district of Kurremölla. 



Even with due regard to the facts just related and to 

 the unmistakable affinity to the Wealden presented by the 

 flora, the reference of the plant-bearing series to that forma- 

 tion is not justified at present. The character of the flora, 

 however, proves sufficiently that these beds, as already stated 

 by Prof. Nathorst, are younger than the rest of the Jurassic 

 series known in Sweden. 



* Bartholin, C. T , Planteforsteninger fra Holsterhus paa Bornholm. 

 Danmarks Geol. Unders. 2 R. No. 24. 



^ Cfr. Deecke, W., Geologie vot, Pommern. 1907. Pp. 60—63. — We 

 are indebted to Dr. K. A. Grönwall for information on these facts. 



' Grönwall, K. a., Forsten ingsförende Blokke fra Langeland, Sydfyn 

 og Aero. Danmarks Geol. Unders. 2 R. N.o 15. Pp. 20—22. 



