EXPLANATION OF PLATE II 



UPPER FIGURE. DIKES IN MARBLE 



The locality is on the west side of Reid Inlet, Glacier Bay, between 

 Hugh Miller and Reid glaciers. The cliff is glaciated, and has been 

 so recently bared by the retreat of Grand Pacific Glacier as to be prac- 

 tically unweathered. From a photograph by G. K. Gilbert, 1899. 

 See page 20. 



LOWER FIGURE. CHERT STRATA 



The locality is on the northeast side of Halibut Cove, Kachemak 

 Bay, Cook Inlet, close to the end of the outer gravel beach. From a 

 photograph by G. K. Gilbert, 1899. See page 26. 





