322 
right angles to the boundary planes (see p. 42, Fig. 6, and p. 61, 
Fig. 10), but in such cases the stratification becomes indistinct, 
and finally disappears on approaching the boundary. At other 
places, especially at the eastern boundary, the marginal parts 
of the sheets are bent almost vertically upward until they be- 
come almost parallel to the walls of the encasing rocks (see p. 
13, Fig. 12). 
Apart from this last mentioned abnormal dip the sheets 
show, on the whole, a low and moderate inclination towards the 
centre of the area occupied by the stratified batholite. Towards 
ee — 
eee 
— _— >= 
u aie > 
ae —_ eee, я 
Se > Arfvedsonite - 
je — 
А We SER IS 
DS er bees! Miter tetas | м 
ms, Denn Puloxkite nies CO 0 se 
PRES Sodalite - foyaite er 
о ЕЕ Е sage 
ee PAIR 
& Kakortokites 
Fig. 29. Diagrammatic section of the stratified part of the Ilimausak batholite. 
this point also the porphyry strata which form the roof of the 
batholite are inclined, and the same dip also affects the series 
of sandstone beds and volcanic sheets which surround the 
southwestern, the northwestern, and the northeastern sides of 
the batholite. From this we may conclude that the sheets of 
the batholite were originally more horizontal than at present, 
and that they have attained their concave form by reason of 
a local subsidence, which reaches its maximum beneath the 
central part of the batholite. 
The breccia zone. — At the junction of the light-coloured 
naujaite with the dark lujavrite the regular transitions from 
