STRIKE FIORDS 



'55 



part of Taiya Valley has a similar character, and it 

 seems to me probable that these gorges have been only 

 moderately deepened by glaciers. The pre-glacial stream 

 grades which they suggest would pass below present tide- 

 level before reaching the head of Lynn Canal, and would 

 be adjusted to a quite low base-level at the south end of 

 Chatham Strait. 



The bottom of the main trough is characterized by much 



FIG. 78. PROFILE FROM TAIYA PASS SOUTHWARD. 



The profile follows the lowest line through Taiya Valley, Taiya Inlet, Lynn Canal and 

 part of Chatham Strait. Whole distance 165 miles. Vertical scale about ten times the hori- 

 zontal. Base line 3,000 feet below sea-level. The approximate height of mountains east of 

 the trough is indicated. 



irregularity. The line of deepest water is sinuous and 

 often wanders far from the middle, and along this line the 

 depth varies irregularly (fig. 78). The soundings are 



FIG. 79. CROSS-PROFILES ABOUT HEAD OF LYNN CANAL. 



Based on contour map by Canadian Boundary Commission and soundings by U. S. Coast 

 Survey. The positions are indicated by corresponding letters in figure 78. Profile A crosses 

 Chilkoot Lake (fig. 75), Ferebee Inlet and Taiya Inlet. Profile B crosses Chilkat Inlet, near 

 Davidson Glacier, and Lynn Canal. Profile C crosses Lynn Canal below Sullivan Island. 

 S. L., sea-level. Base line 3,000 feet below sea-level. Vertical scale same as horizontal. 



too far apart to give expression to details of configuration, 

 and we do not know to what extent the irregularities may 



