1913] TRANSITIONAL QUATERNARY STRATA 5 



III. Then vve meet with a highly interesting series of alter- 

 nating layers of sand and clay just of the same type as that 

 which the author described on a former occasion ("The Quater- 

 nary Section of Foss", 1913). This section of the series of gla- 

 cial strata I succeeded in recognizing for the first time as a 

 special one just in the clay-pits of the tile-work of Bentse in 

 the summer of 1900. And, afterwards I traced the layers, as 

 excavation of the clay took place, and on different occasions 

 I demonstrated these different sections of the glacial and post- 

 glacial series for the University students attending my excursions. 

 In a short paper, "Nogle bemærkninger om klimatforandring" 

 (Christiania Vid.-Selsk. Forh. 1904, No. 10) a general view of the 

 different sections vvas for the first time published. Later on I 

 placed the different sections of the series into a more complete 

 and systematic order ("Kvartær-studier i den sydøstlige del af 

 vort land", 1908, p. 118), and, to the International Geological 

 Congress of Stockholm 1910 I presented a paper. "A brief Sum- 

 mary of the Evidence furnished by Glacial Phenomena and fos- 

 siliferous Deposits in Norway as to Late-Quaternary Climate" 

 (Postglaziale Klimaverånderungen, pp. 339 — 343) in which the 

 general view was still further extended in conformity to my 

 lectures delivered in the University of Christiania in the pre- 

 ceeding years. 



In conformity to this view the above heads I and II of the 

 present paper are to be placed as the representative sections of 

 the Sveneng intra-glacial stage, and the present head III is to 

 be regarded as the representative layer of the Aker glacial stage. 

 The present layer, III, proves to be a composite, or even 

 complex one. Directly overlying the deposit of the Sveneng 

 intra-glacial stage is a layer of sand, and, in ascending order we 

 meet with the following series : — 



15 cm. sand of reddish-grey colour. 

 5 „ clay of bluish-grey colour. 



10 „ sand of reddish-grey colour. 



20 „ clay of bluish-grey colour. 



15 „ sand of reddish-grey colour. 



