33 



whereas the sand and clay for tlie most part must have been 

 derived from the land. 



It is rather interesting to compare the mechanical consti- 

 tution of these samples with that of till. The average com- 

 position of 9 samples from Funen is M 



below 

 0.01 mm. 



001-005 005— 0-5 1 0-5—1 1—2 above 



mm. 2 mm. 



mm. 1 mm. \ mm. 



31-7 I 13-9 I 462 1-6 2-7 ■ 39 



On the whole there is a rather strong likeness between 

 the samples and the till. The most conspicuous difference 

 between the two is that the till is very rich in ingredients 

 between 005 and 0"5°^°i, and has a correspondingly smaller 

 proportion of the finer ingredients. With regard to the coarser 

 parts, the samples contain much more than the till, yet Ave 

 must here notice that this larger proportion of coarse material 

 is almost confined to a few samples which are very rich in 

 pebbles, the remaining samples containing much less. The 

 9 samples of till on the other hand are unvaryingly homo- 

 geneous. This homogenous character alone is sufficient to 

 enable us to distinguish, with tolerable certainty, between till 

 and sea-floor deposits. If the latter were found to have a com- 

 position resembling that of till, they must have been deposited 

 in an icefilled sea, and we cannot but think that currents, and 

 many other circumstances would, in that case cause them to 

 vary very much in the individual localities. Besides the till itself 

 if deposited on rugged ground would probably show a somewhat 

 varying constitution. 



'; Beskrivelse til geol. Kort over Danmarit, Koitbiadet Hindsholm by 

 N. V. Г s sin g and Victor Madsen. Danm. geol. Undersøgelse. 

 1. Hæk ke, Nr. 2, p. 77. 



XXVIII. 3 



