355 
Origin of banded kakortokites. — The kakortokite mass of 
Kringlerne is the most remarkable portion of the abyssal com- 
plex of [limausak. The batholite on the whole is characterized 
by an uncommonly well marked stratification, but with the ka- 
kortokite this structure is developed to such a degree that it 
may almost be said to be unique (comp. PI. IX). The geo- 
logical description of this rock body is given in the third 
chapter (pp. 43—47); for petrography and analyses see (pp. 
177—184). 
The kakortokite mass considered as a whole has the com- 
position of a lujavrite which is slightly enriched in arfvedsonite 
and eudialyte (see table p. 344). As it belongs to the more 
deeply seated portions of the agpaitic complex this enrichment 
may perhaps be due to subsidence of crystals through the 
magma. The coarse-grained structure proves that the kakor- 
tokite has crystallized under much more undisturbed conditions 
than the lujavrite. As to the date of its consolidation obser- 
vations seem to show that it is approximately contemporaneous 
with the lujavrite, but the exact age relations between these 
rocks have not with certainty been made out. As previously 
mentioned the kakortokite at some places is not only covered 
with lujavrite, but also underlain by this rock. It may be, how- 
ever, that the kakortokite consolidated first, and that as a result 
of the movements connected with the subsidence of the roof of 
the batholite a portion of the lujavrite in a fluid condition was 
forced into its present position below the other rock. 
From other countries several examples of stratified abyssai 
rocks are known. The most famous are the banded gabbros of 
Skye, described by A. бете and Teart!, and the ultrabasic rocks 
of Rum, described by Harrer”, Of these only the latter oc- 
currence presents features which are all comparable with those 
1 Quaterly Journal of the Geol. Soc., Vol. 50, 1894, p. 645. 
? Geology of the small Isles of Invernessshire. Memoirs of the Geol. 
Surv., 1908, p. 69. 
237 
