32 P. A. øyen [No. 12 



terraces, one at a level of 168 m. a. s. and another at a level of 

 153 m. a. s. Further on towards the north we meet with more 

 terraces indicating various sea-levels as an evidence of different 

 stages in the gradual rising of land, and the rather flat or slightly 

 undulating bottom of the valley through Høland and Urskog 

 gives at hand a highly interesting field of stratigraphical research. 

 Out of this superfluous material we are on this occasion only to 

 direct special attention to one single phenomenon in one single 

 locality, viz. the one described by myself on a former occasion 

 (1. c. pp. 8 — 10) from the abolished tile-work of Killingmo. In 

 Pl. IX we find a view of the immediate surroundings of that 

 locality. The back-ground of the photograph presents to us a 

 view of the eroded and rather uneven ground of archaean rocks, 

 partly, and more especially in the valleys, covered either with 

 morainic material or fluvio-glacial deposits or even in many 

 cases with marine terraces and clay-deposits as seen in the 

 middle part of the photograph and in the rather smooth fore- 

 ground of the same. In the middle of the picture we are looking 

 upon a rather well developed and very conspicuous terrace that may 

 be traced over a wide district all upp to the surroundings of the 

 Lake of Mjøsen and to the lower part of the Valley of Østerdalen. 

 Near the farm of Killingmo this sloping and somewhat undu- 

 lating terrace is rising to a height of 197 m. a. s., and, only at a 

 rather short distance to the north-west the sandy plains near 

 the farms of Sandum is rising to the height of 203 m. a. s. As 

 yet, I have not, however, been successfull enough to find any 

 organic remains in the layers of this terrace. The flat and wide 

 terrace representing the foreground of the picture is highly 

 interesting as it proved to be rather rich in fossils at a height 

 of 177 m. a. s. This fossit-bearing terrace is built up of rather 

 thin layers of sandy clay of a bluish-grey or yellowish-grey 

 colour. This clay proved to contain fine or rather nice casts of 

 Portlandia arctica Gray var. portlandica Hitchcock. 



Then we have entered upon a highly interesting field of 

 stratigraphical investigation as a continuous sheet of fossil- 

 bearing clay of a rather great thickness, often crowded with 



