22 P. A. øyen [No. 12 



and the layer B as contemporaneous with the Eidsberg-division 

 (Christiania Vid.-Selsk. Skr. I. Mathem.-Naturvid. Kl. 1908, Nr. 2, 

 p. 36). The find made by Keilhau and Sårs of Pecten septem- 

 radiatus Mull., Leda pernula Mull., Area glacialis Gray, 

 forma typica and Siphonodentalium vitreum Sårs at Skiptvet 

 seems to be an evidence that the clay deposits on both sides of 

 the river of Glommen belong to the very same period of depo- 

 sition as we in the clay-banks of that river are following 

 the same stratigraphic series on each side of it. The plan and 

 regnlar layers of the clay-deposit at the tile-work of Rakkestad 

 and the corresponding stratigraphy of clay-layers on both sides 

 of the main river give a clear evidence of quite the same fact as 

 is also conspicuously represented in the very topographical 

 features of the terraces that prove a large and continous sheet 

 of clay-deposits to cover a rather wide district of this part 

 of the country. A couple of pictures may give some good 

 idea of this feature of the terraces. In the first one, Pl. VII, 

 Fig. 1, we are confronted with the fossil-bearing terrace of 

 Grønsund with a view towards the Ghurch of Eidsberg to the 

 South-East. In the latter one, Pl. VII, Fig. 2, we have before 

 us a view from the opposite bank of the river of Glommen 

 looking towards the North from the Ghurch of Heli. 



Another interesting deposit of fossil-bearing clay I discovered 

 on the third of October 1909 to the south of the railway-station 

 of Spydeberg, between one kilometer and a half and two kilometres 

 south of the station itself and at a height of about 97 metres 

 above sea-level. A wood of white fir, and birch, and alder in 

 this places covered a deposit of yellowish-grey clay that in 

 some places had a dash of streaked or waved colour. Only 

 in some deeper cuttings a bluish-grey colour might be seen. 

 The clay proved to be rather fine, only a little sandy and in 

 addition to the fossils it also contained some clay-concretions of a 

 rusty-brown colour. A very fine and regular lamination of thin 

 layers might be detected in the clay. The thickness of the clay 

 deposit has not been determined, the fossils, however, have been 

 tåken from a depth of between one or two metres. The upper 



