356 
of the stratified kakortokite. There are, however, also con- 
siderable differences, and the interpretation given by Harxer — 
that the different sheets of the ultrabasie rocks of Rum repre- 
sent distinct intrusions — is not directly applicable to the case 
here considered. | 
The peculiar kind of stratification characterizing the kakor- 
tokitic complex will appear from the following list of a number 
of consecutive sheets: 
black kakortokite ; thickness ca. 2— 3 meters; sp. gr.ca.3°12 
white kakortokite » 6—9 » ni MAG 
red kakortokite » 1—2 » м1 0255 
black kakortokite » 2—-3 » DR 3309 
white kakortokite » 6—9 » Bu, 23 
red kakortokite » 1—2 » ne) 002888 
black kakortokite » 2—3 » DV. 
The succession as given in this table continues through a total 
thickness of about 400 meters, the number of individual sheets 
amounting to more than a hundred, while the number of repe- 
titions of colour sets is about forty. It is worth mentioning that 
the red sheets in many places are badly developed or even want- 
ing, but even in such cases the lowermost portions of the white 
sheets or the uppermost portions of the black ones are rela- 
tively rich in eudialyte. 
In general it may be said that a considerable number of 
processes are known which can produce banded structures in 
igneous rocks. In the present case, however, since we are 
concerned with abyssal rocks in a locality where the co-opera- 
tion of crusial stresses is precluded, the question is less com- 
plicated, and the banded structure of the kakortokite must be 
supposed to have originated either by successive intrusion of 
different kinds of magma or by differentiation in place. 
The theory of successive intrusion, as has already been 
