U. S. DEPARTMENT OF AGRICULTURE 
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39° 
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IMPORTANT SOIL REGIONS AND PLANT GROWTH REGIONS OF THE UNITED STATES 
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SOIL CONSERVATION SERVICE 
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(Southern) light brown to gray fine sandy loams to silty clay loams, de- 
veloped on limestone or unconsolidated sands, silts, and clays. (Uvalde, 
SIEROZEM AND DESERT SOILS 
(Northern) gray and grayish-brown soils, developed on loess and alluvial 
fans. (Ritzville, Portneuf,) 
(Southern) gray, brown, and reddish soils, developed on alluvial fans. 
SOILS OF THE PACIFIC VALLEYS 
Soils too intimately associated to separate on a schematic map. (San- 
Joaquin, Fresno, Hanford.) 
INTRAZONAL AND AZONAL SOILS 
Rough and mountainous. 
Largely sands, some of which are associated with bogs. (Valentine sand, 
Black (or brown) friable soil underlain by chalky materials. These soils 
develop under a prairie vegetation and are known as Rendzinas (Houston, 
Shallow stony soils from limestone. (Valera, Ector.) 
Marsh, Swamp and Bog. (Carlisle, Pamlico, Rifle.) 
Soils developed upon lake plains. (Brookston, Maumee, Vergennes.) 
Alluvial soils. (Huntington, Sharkey, Columbia, Cass.) 
Rough broken land, including Pierre soils. 
° ° ° ° ° ° ° ° a sea = 5 els = 
121 119 17 115 3 Wl 109 107 105° 103 101° 99° 97° 95 93° 
Scale in Miles 
100 50 25 0 50 100 200 300 
LEGEND FOR IMPORTANT SOIL REGIONS 
The names in parentheses refer to the more extensive or representative 
soil series in the respective regions. 
| PODZOLS 15 Silt loams, developed largely from loess. (Clinton, Fayette.) 28 Dark brown silt loams with yellowish-brown subsoils, developed on glacial 39 
| 1 Rough stony land. 76 \|mperfectly drained grayish silt loams developed from acid glacial drift. drift and loess. (Carrington, Tama, Clarion, Marshall.) 
| 2 Loams and silt loams, developed from sandstones and shales. (Leetonia, (Spencer.) 2 Dark brown to reddish-brown silt loams and clay loams, developed from Reagan.) 
j De Kalb.) ‘7 Loams and silt loams developed from sandstones and shales. (Melbourne.) limestone and calcareous shales. (Summit, Crawford.) 
| 3 Sands and loamy sands, developed on glacial drift. (Roselawn, Kalkaska.) 18 Grayish-yellow to reddish silt loams, developed from cherty limestones. 2o bas bow or See Say alt loams, having heavy subsoils or claypans. Ae 
4 Loams and clay loams, developed on glacial drift. (Hermon, Ontonagon.) SR a ee ae AOSHI EERE Eien y, Putnam.) i 
GRAY-BROWN PODZOLIC SOILS F 
| : é 4 en 19 Brownish-red clay loams and gray sandy loams, developed from crystalline 31 Black loams, silt loams and clay loams, developed on calcareous glacial (Reeves, Mohave. 
; cee ee eee a le ely Cale inset lin: Muah rocks of the southern Piedrnont. (Cecil, Durham, Appling, Georgeville, drift or lacustrine deposits. (Barnes, Bearden, Fargo.) 
6 Silty | asa d leced d Peter ire Davidson.) 32 Dark grayish-brown loams and silt loams, developed from loess. (Moody, 42 
rae vast ae OU ats eveloped on sandstones and shales. 20 Yellow to light brown silt loams, developed on loess. (Memphis, Grenada.) Holdrege.) 
! ‘ ‘ 21 i i 33 Dark. ish- i ith cl ; m loess. (Crete, 
7 Loams and silt loams, developed on acid glacial drift, sandstone and shale ah reecpeuieeee A aeaueaamee developed from Coastal Plain Heed brown silt loams with claypans, developed fro! (Crete ie 
6 Habis CA Sea i rues (Gloucester Trey) 22 Brownish-red to red silt loams and clay loams, developed from limestone. SOUTHERN CHERNOZEM -- DARK BROWN SOILS 44 
5 v cf Z x ee wie ‘ (Dewey, Decatur, Fullerton.) 34 Heavy or moderately heavy dark brown soils, developed from calcareous Dune sand, etc.) 
Se as on mons aevezed on the crystalline rocks of the northern 23 Grayish-yellow to light brown sands and fine sands of the Coastal Plain. materials. (Pullman, Abilene, Victoria.) 45 
43 A Pie hie a anor) : 4 S (Norfolk sands.) : 35 Predominantly red and brown sandy loams and sands, developed largely 
ze ee Bair eve pees on northern Coastal Plain sands and clays. (Sas- 24 Grayish fine sandy loams with some gray or black loams, in the Flatwoods from unconsolidated calcareous materials. (Amarillo, Miles, Duval.) Sumiter,) 
; palras: ve ington. ; ick.) area of the Coastal Plain. (Coxville, Leon, Portsmouth.) NORTHERN DARK BROWN (CHESTNUT) SOILS 46 
zg crown slit teams, developedicg limestenes ilaverswuen Maury shradedel 2°" Grayish-yellow to reddish fine sandy loams and silt loams, developed from 36 Dark brown soils developed on unconsolidated, calcareous sands, silts, and 47 
i2 Shallow soils developed on interbedded limestone and calcareous shales. sandstones and shales. (Hartselis, Hanceville, Conway.) clays. (Scobey, Rosebud, Keith, Walla Walla.) Fe 
(felrmont, Lowell) dor cer eee ; 2° Red soils of the Pacific slopes. (Aiken, Sierra, Sites.) 37 Dark brown soils, developed on heterogeneous material. 49 
13 Loams and stony loams from granitic material with hilly to mountainous PRAIRIE SOILS BROWN SOILS iA 
HOUSE NGS lean e) 27 Reddish-brown soils, developed on sandstones, shales clays and sands. 38 
Silt loams with heavy clay subsoils, developed on Illinoian glacial till. 
(Gibson, Cory, Clermont, Rossmoyne.) 
North Pacific Coast. 
Willamette Valley -- Puget Sound. 
Central California Valleys. 
Cascade - Sierra Nevada. 
Southern California. 
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Columbia River Valley. 
Palouse - Bitterroot Valley. 
Snake River Plain Utah Valley. 
Great Basin - Intermontane. 
Southwestern Desert. 
Southern Plateau. 
(Zaneis, Renfrew.) 
(Northern) brown loams, developed on unconsolidated sands, silts and 
Clays. (Joplin, Weld.) 
LEGEND FOR PLANT GROWTH REGIONS 
FH 13 
Central Rocky Mountains. 
“Cy 16 
ZZ) \7 
Central Great Plains. 
Southern Plains. 
Northern Rocky Mountains. 
ISSJ 18 
14 Southern Rocky Mountains. 19 
— 15. Northern Great Plains. 20 
[ZA 2 
KS 22 
A) 
(1 24 
Tit] 25 
ZZ 26 
Eee 27 
Northern Black Soils. 
Central Black Soils. 
Southern Black Soils. 
Western Great Lakes. 
Central Great Lakes. 
Northern Prairies. 
Central Prairies. Appalachian. 
Ozark - Ohio - Tennessee River Valleys 
Northern Great Lakes -St. Lawrence. 
28 
Piedmont. 
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RASS Upper Coastal Plain. 
(Ll 30 
Fy 3! 
[22s] 32 
Swampy Coastal Plain. 
South - Central Florida. 
Subtropical Florida. 
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1937 
Important Soils Regions by Bureau of Chemistry and Soils, U. S. D. A. 
Plant growth Regions by Furman Lloyd Mulford, Bureau of Plant Industry, U. S. D. A. 
Map prepared by Cartographic Drafting Unit 
