Plate 10. 



Sheared phase of Siyeh limestone, Clarke Range. Light parts highly magnesian ; dark parts 

 nearly pure calcium carbonate. Three-fourths natural size. 



.■" 



Sheared phase of dolomitic lense (weathered) in Kitchener formation, at Yahk River. Illustrates 

 molar-tooth structure ; sunken parts, calcium carbonate, and projecting ribs, silicious 

 magnesian limestone. Two-thirds natural size. 

 25a — vol. ii — p. 74. 



