DALY: GEOLOGY OF THE NORTHEAST COAST OF LABRADui:. 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 inlet. 

 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, 



Figure 2. — Longitudi- 

 nal section of Nachvak 

 Bay. 



