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——
: REFERENCES. | ®
showing the i DP Le A Lands S
SURFACE STRUCTURE ; ay ; SEO ees
AND ISOTHERMAL LINES. : : Low Lands.
Cascade Range and ReckyMountain
15,000 ft. ‘ Sierra Nevada System. ystem.
10,000 w 1 = ~ + AT S 15,000f%.
ao PACLFIC THE GREAT BASIN ae ee ‘ Appalachi O00 E
SO ery SLOPE THE GREAT PLAINS  wuie MISSISSIPPI VALLEY PPSystem. Soe Bono
[Pacitic Ocean CALIFORNIA [NEVADA]U T A H| COLORADO se ae