X CONTENTS. 



CHAPTER VII. 

 ASULKAN GLACIER. 



PAGE 



1. General Characteristics . -97 



2. Piedmont Characteristics . 9 8 



3. Nourishment . 



4. Moraines . I0 



5. Crevasses 



6. Ice Structure . 



7. Drainage 



8. Frontal Changes . .106 



9. Former Activity 



a. Development and decadence 



b. Bear-den moraines . 



c. Rate of retreat Io8 



CHAPTER VIII. 



SUMMARY AND CONCLUSIONS. 



1. Physiographic Changes in the Region I0 9 



a. Mesozoic peneplain . 



b. Pre-pleistocene erosion 



c. Pleistocene erosion 



d. Pleistocene deposition 



2. Precipitation . 



a. Geographic distribution 



b. Climatic cycles . . l 1 2 



c. Ice waves 



3. Piedmont Type of Glaciers JI 4 



4. Parasitic Glacier . T 1 4 



5. Bear-den Moraines . 



6. Surface Features . .118 



a. Dirt bands, zones, and stripes 



b. Differential melting effects . 



7. Ice Structure .... I2 



a. Stratification . 



b. Shearing 



c. Blue bands . 



d. Ice dykes 



e. Glacial granules 



8. Theories of Glacial Motion . .129 



9. Color of Ice and Glacial Water . . . T 3' 



