''ii,|li]i!jiiijii|liiiipiitiii|i|iliiw"''ni'('wiiiiiiniw«iiii' 



/r*^ 



FIG n NORTH SIDE OF RB CUT AT SOUTH END OF CHALK yiT SHOWING PORPHWClT CUTTING THROUGH SANDSTONE 



FIO a SAME CUT SOUTH SIDE P PORPHYRT S SANDSTONE Sh SHALE 



sBienA Co.IiLh. 



RHYOLITE AND PORPHYRY 



CHALK MOUNTAIN 



l.F. Emmons, Geologi! 



