THE LA URENTIAN PENEPLAIN 



627 



which have been made across the different parts of the area show, 

 particularly for the western portion of the peneplain between 

 the Great Lakes and the Arctic Ocean, that for many miles 

 the greatest elevation is often not over fifty feet higher than the 



Y\G. 2. — East coast of Hudson Bay, six miles up tlie Povungnituk River. Eleva- 

 tion 50', looking inland. 



{Photograph by A. P. Low, iSgg.) 



adjacent lowest depression, and as a rule the actual surface may 

 be described as gently undulating. Occasionally the measure of 

 relief may equal one hundred feet, but, particularly in the western 

 arm of the peneplain, elevations of this amount are prominent 



Fig. 3. — East side of Hudson Bay, thirty miles up Sorehead River. Elevation 



about 150', looking inland. 



{Photograph by A. P. Lo'w, i8gg.) 



landmarks, visible for many miles, and from a distance are fre- 

 quently seen to stand above the even sky-line of the adjacent 

 regions, so that they may more properly be classed as monad- 

 nocks. In the country to the south of James Bay the measure 

 of relief is somewhat greater, but the even sky-line, occasionally 

 intercepted by residuals, is still the dominant topographic 

 feature. In the eastern portion of the peneplain for long dis- 



