DALY: GEOLOGY OF THE NORTHEAST COAST OF LABRADOR. 231 
line of breakers athwart the bay entrance. 
Ships generally enter the bay by a broad chan- 
nel running from Gulch Cape close against the 
shore. The sill appears to be represented on 
its bottom where a sounding gave twenty-five 
fathoms of water. The sill thus rims about the 
mouth of the bay in a gentle curve. To the 
eastward the Admiralty charts indicate con- 
siderably shallower water than that in the bay 
itself. Up to a distance of twelve miles from 
the Narrows, the average depth of the bay is 
one hundred fathoms; then the bottom rises 
rapidly to a narrow bar running across the iulet. 
Upon it the maximum depth obtained was 
eighteen fathoms. The bar ends at either shore 
in a projecting spur of bed-rock; a fact that 
seemed to indicate that we have here to do with 
a rock-sill. Eight miles further west, a very 
similar sill crosses the bay, with a maximum 
depth of fifteen fathoms. To east and west of 
this bar, eighty and sixty-eight fathoms respect- 
ively were found. This coincidence in location 
of sills with constrictions in the fiord seems to 
be exceptional among the features of this type of 
inlet. A longitudinal profile of the bottom is 
given in Figure 2. The broadly U-shaped trans- 
verse profile of the Tallek is probably of the 
same general quality as the average cross-section 
of the whole fiord. 
The extremely rapid destruction of the fiord 
walls, rendered so steep by glacial ‘‘ over-deepen- 
ing” has entailed the growth of abundant talus, 
and thereby the declivity of the submerged slopes 
has been diminished. This filling of the trench 
is particularly noticeable at the base of the 
numerous alluvial cones and fans which almost 
invariably appear where strong lateral ravines 
notch the cliffs. Creeping and leaping of the 
glacial] drift down the slopes is going on apace. 
Large scallops or tongues of streaming clay, 
SWOHLV4S NI SHIddd 
STW + 
Ficure 2. — Longitudi- 
nal section of Nachvak 
Bay. 
