KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 57. N:0 |. 



Mode of occurrence of the plant-remains. 



The plant-bearing beds of the Röragen area belong to a series of conglomerates, 

 sandstones, slates, and breccias, the entire thickness of which araounts to more than 

 900 m. (Goldschmidt, 1913 a, p. 17). The beds are not f olded but steeply inclined, dip- 

 ping on an average 45 — 50° towards SE. A full account of the stratigraphical and tec- 

 tonic conditions will be found in Professor Goldschmidt's paper. The plant-remains 

 occur in the grey sandstones and slates in the lower and middle part of the series. The 

 lowest and tlie highest beds in whicli plant-remains ha ve been collected are separated 

 by sediments of a thickness of more than 200 m. in which numerous plant-bearing hori- 

 zons occur. In most of these plant-bearing beds, however, only undeterminable or little 

 characteristic fossils are found: most of the determinable plant-remains were collected 



Fig. 1. Animal tracks on a slab of slate. Nat. sizo. 



in a couple of narrowly circumscribed localities and chiefly in loose boulders. There is, at 

 least for the present, no evidence on which a palaeontological subdivision of the series 

 could be based : all the plant-remains described in this paper may with saf ety be regarded 

 as belonging to one and the same palaeontological horizon. Most of the different kinds 

 of plant-remains are indeed occasionally found in association on the same slab. 



Professor Goldschmidt considers the plant-bearing series as being probably a 

 fresh-water deposit laid down in a narrowly confined basin. This is suggested not only 

 by the absence of marine fossils and the abundance of plant-remains but also by the 

 nature of the sediments which seems to exclude the possibility of a long transport. Some 

 of the plant-remains, as for instance those shown in my pl. 2, fig. 11, occur in a markedly 

 parallel position över large slabs: they were probably water-plants swayed to one side 

 by the current or the waves, as for instance the floating leaves of our Spargania. A 



