Western Upland underlain by Ordovician dolomites

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Major Physiographic Divisions of Wisconsin(after
Dutton and Bradley, 1970)
Lake Superior Lowland (underlain by Upper
Keweenawan sandstone and conglomerate)
LS
Northern Highland (underlain by Precambrian
crystalline rocks)
NH
Central Plain (underlain by upper Cambrian
sandstone)
CP
Eastern Ridges and Lowlands (underlain by
Ordovician, Silurian and Devonian dolomites)
ERL
Western Upland (underlain by Ordovician dolomites)
WU
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Glacial Deposits of Wisconsin
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Three Major Soil Regions of Wisconsin, Generalized
Well to poorly drained soils of prairie and
associated woodlands (Udoll-Alfisol-Aquill soil
region that extends southwest to Nebraska) Well
to poorly drained forest soils with associated
wet prairies and sandy Regosols(Aalfisol-Aquoll-En
tisol soil region that extends to the Appalachian
Mountains. Well to poorly drained soils of mixed
conifer-hardwood and swamp conifer forest lands
(Spodosol-Histosol soil region that extends to
Alaska and Nova Scotia)
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Stippled areas represent sands and peats.
(Psamment-Aquent-Fibrist soils) The dashed line
represents the ecological "Tension Zone" of
Curtis (1959)
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AT BF BG BOG CG FN ND NDM NM NS NWM NW OB OO PB PD
PDM PM PWM PW SB SC SD SDM SM SS SWM SW
Alder Thicket Boreal Forest Bracken-Grassland Open
Bog Cedar Glade Fen Northern Dry Forest Northern
Dry-Mesic Forest Northern Mesic Forest Northern
Sedge Meadow Northern Wet-Mesic Forest Northern
Wet Forest Oak Barrens Oak Opening Pine
Barrens Dry Prairie Dry-Mesic Prairie Mesic
Prairie Wet-Mesic Prairie Wet Prairie Sand
Barrens Shrub-Carr Southern Dry Forest Southern
Dry-Mesic Forest Southern Mesic Forest Southern
Sedge Meadow Southern Wet-Mesic Forest Southern
Wet Forest
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Figure 6.-Isorithms for certain climatic factors
which are correlated with the tension zone. 1,
average summer temperature of 67 degrees F. 2,
average snowfall of 48" 3, average evaporation
during July of 5" 4, sixty days per year with
average temperature above 68 degree F. 5,
ninety-five days per year with 0.01 of rain or
more.