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Show State Arizona ( all) Arizona ( southern) Western Colorado ( northern half) Western Colorado ( southern half) Utah Utah ( southwestern) Utah ( southeastern) Utah ( northeastern) Nevada Nevada ( southern) California Wyoming ( Green River area) Slopes E. and West. N- facing S- facing average elevations average elevations average elevations E. and West. N- facing S- facing E. and WTest_ N- facing S- facing E. and West. N- facing S- facing E. and West. N- facing S- facing average elevations E. and West. N- facing S- facing average elevations ( 4) average elevations average average E. and West N- facing S- facing average elevations ( 6) E. and West N- facing S- facing Upper Sonoran ( 2) 4,000 4,000 5,560 5,100 6,000 4,250 4,000 4,500 base level do do base level do do 3,900 3,500+ 3,200 3,100 Lee's Ferry base level 3,900 ( 5) 4,500 base level do do __. Transition 6,800 6,500 7,250 6,800 7,000 E. & W. 6,000 N. 5,000 S. 7,000 6,860 7,500 6,000 5,800 6,300 6,500 6,000 7,500 6,500 6,000 7,500 E. & W. 6,800 N- facing 5,000 S- facing 7,800 av. 6,200 S- facing 6,500 7,000- 7,500 7,000 E. & W. 6,800 N- facing 5,000 S- facing 7,800 8,000 8,000 7,000 7,000 6,500 6,000 7,000 Boreal 8,200 8,800 8,300 8,200 8,000 average 9,000 7,500 ( 3) 7,600 7,000 8,200 8,500 8,000 9,000 6,800 8,000 8,000 8,000 8,800 9,000 N. 7,500 S. 8,500 7,500 8,500 Authority Rasmussen ( 1941) ( Kaibab Plateau) Hanson ( 1924) ( Little Colorado River) Jenks Nichol ( 1937) Martin and Fletcher ( 1943) Shreve ( 1915) Cary ( 1911) Cary ( 1911) Tidestrom ( 1925) Behle ( 1943) Woodbury and Russell ( 1945) Clover and Jotter ( 1944) Graham Tidestrom ( 1925) Van Rossem ( 1936) Miller ( 1945) Bond and Jewett ( 1940) Cary ( 1917) 5 Disagrees with others on U. S. Zone indicators, of Hall and Grinnel ( 26). fi Southern Arizona zone elevation data used, but checked with Grinnel ( 1935). 2 Areas given instead of altitudes for this zone. 3 None on south slope. * Colorado River canyon bottom. 221 |