ioio] 



VESTAL— PHYTOGEOGRAPHY OF COLORADO 



163 



V 



Figs. 4, 5. — Upturned sedimentary ridges of mountain-front zone: fig. 4, eastward 

 view in Perry Park, where a broad flat valley has been leveled between ridges and 

 outer granitic foothills; floor of flat is of compacted angular fragments; vegetation 

 is primitive grassland alternating with scrub oak; Dawson Butte in far background; 

 fig. 5, southward view, between Golden and Morrison, of longitudinal valley inside 

 Dakota hogback, shown on left in long curve. 



