ROCKS AND SCENERY 95 
ridges of intruded basaltic rock ascend the higher 
slopes, one of them dipping steeply down into 
the ravine in front of a light yellow face of rock 
which reflects the light: a continuation of the 
same dyke rises as a lofty curtain wall on the right- 
hand slope of the valley. Fig. 46 represents an 
attempt to convey something of the impression 
made by the weathered and towering masses of 
the rust-coloured basalt dyke penetrating the 
eroded slopes of the sandstone above the stream. 
The light yellow tones of the sandstones and 
the darker tones of the basalts are relieved by 
clumps of bright yellow Dandelions and Arnicas, 
purple Willowherbs, and clusters of the tall russet- 
brown Oxyria, a plant allied to the common Dock. 
From Atanikerdluk we went to the small Settle- 
ment of Sarkak on the mainland, where the 
gneissic rocks replace the sedimentary strata and 
basalts of the Nigssuaq Peninsula. From Sarkak 
a short excursion in search of fossils was made in 
an umyak to a place affording a good view of the 
Sarkak valley in which flows the largest river we 
saw. On one side of the broad valley are hills of 
gneiss with the much more modern flat-topped 
basaltic hills beyond; on the opposite side the hills 
consist of the sandstones and other sedimentary 
rocks we had seen at Atanikerdluk. In the valley 
itself dark masses of intruded igneous rocks form 
conspicuous bosses and dykes which lie above the 
river plain as huge serpentine ridges. At a height 
of 1400 ft. on the sandstone hill-side the familiar 
and hardy Harebell (Campanula rotundifolia), which 
