U. S. DEPARTMENT OF AGRICULTURE 
IMPORTANT SOIL REGIONS AND PLANT GROWTH REGIONS OF THE UNITED STATES 
Figure 3 
SOIL CONSERVATION SERVICE 
LEGEND FOR IMPORTANT SOIL REGIONS 
The names in parentheses refer to the more extensive or representative 
soil series in the respective regions. 
PODZOLS 
Rough stony land. 
Loams and silt loams, developed from sandstones and shales. (Leetonia, 
De Kalb.) 
Sands and loamy sands, developed on glacial drift. (Roselawn, Kalkaska.) 
Loams and clay loams, developed on glacial drift (Hermon, Ontonagon.) 
GRAY-BROWN PODZOLIC SOILS 
Loams and silt loams, developed on calcareous glacial drift. (Miami, 
Crosby and Honeoye ■ Ontario.) 
Silty loams or stony loams, developed on sandstones and shales. (Mus- 
kingum, Westmoreland.) 
Loams and silt loams, developed on acid glacial drift, sandstone and shale 
material. (Canfield, Volusia, Lordstown, Wooster.) 
Stony and gravelly loams, developed on glacial drift. (Gloucester, Troy.) 
Loams and silt loams, developed on the crystalline rocks of the northern 
Piedmont. (Chester, Manor.) 
Sandy loams developed on northern Coastal Plain sands and clays. (Sas- 
safrass, Collington.) 
Brown silt loams, developed on limestone. (Hagerstown, Maury, Frederick.) 
Shallow soils developed on interbedded limestone and calcareous shales. 
(Fairmont, Lowell.) 
Loams and stony loams from granitic material with hilly to mountainous 
relief. (Ashe, Porters.) 
Silt loams with heavy clay subsoils, developed on lllinoian glacial till. 
(Gibson, Cory, Clermont, Rossmoyne.) 
Silt loams, developed largely from loess. (Clinton, Fayette.) 
Imperfectly drained grayish silt loams developed from acid glacial drift. 
(Spencer.) 
Loams and silt loams developed from sandstones and shales. (Melbourne.) 
Grayish-yellow to reddish silt loams, developed from cherty limestones. 
(Clarksville, Dickson, Baxter.) 
RED AND YELLOW SOILS 
Brownish-red clay loams and gray sandy loams, developed from crystalline 
rocks of the southern Piedmont. (Cecil, Durham, Appling, Georgeville, 
Davidson.) 
Yellow to light brown silt loams, developed on loess. (Memphis, Grenada.) 
Gray to yellow sandy, fine sandy loams, developed from Coastal Plain 
materials. (Norfolk, Ruston, Orangeburg.) 
Brownish-red to red silt loams and clay loams, developed from limestone. 
(Dewey, Decatur, Fullerton.) 
Grayish-yellow to light brown sands and fine sands of the Coastal Plain. 
(Norfolk sands.) 
Grayish fine sandy loams with some gray or black loams, in the Flatwoods 
area of the Coastal Plain. (Coxville, Leon, Portsmouth.) 
Grayish-yellow to reddish fine sandy loams and silt loams, developed from 
sandstones and shales. (Hartselis, Hanceville, Conway.) 
Red soils of the Pacific slopes. (Aiken, Sierra, Sites.) 
PRAIRIE SOILS 
Reddish-brown soils, developed on sandstones, shales clays and sands. 
(Zaneis, Renfrew.) 
2s Dark brown silt loams with yellowish-brown subsoils, developed on glacial 
drift and loess. (Carrington, Tama, Clarion, Marshall.) 
^3 Dark brown to reddish-brown silt loams and clay loams, developed from 
limestone and calcareous shales. (Summit, Crawford.) 
■30 Dark brown or grayish-brown silt loams, having heavy subsoils or claypans. 
(Cherokee, Parsons, Grundy, Putnam.) 
NORTHERN CHERNOZEM 
31 Black loams, silt loams and clay loams, developed on calcareous glacial 
drift or lacustrine deposits. (Barnes, Bearden, Fargo.) 
32 Dark grayish-brown loams and silt loams, developed from loess. (Moody, 
Holdrege.) 
33 Dark grayish-brown silt loams with claypans, developed from loess. (Crete, 
Hastings.) 
SOUTHERN CHERNOZEM - DARK BROWN SOILS 
Heavy or moderately heavy dark brown soils, developed from calcareous 
materials. (Pullman, Abilene, Victoria.) 
35 Predominantly red and brown sandy loams and sands, developed largely 
from unconsolidated calcareous materials. (Amarillo, Miles, Duval.) 
NORTHERN DARK BROWN (CHESTNUT) SOILS 
36 Dark brown soils developed on unconsolidated, calcareous sands, silts, and 
clays. (Scobey, Rosebud, Keith, Walla Walla.) 
37 Dark brown soils, developed on heterogeneous material. 
BROWN SOILS 
38 (Northern) brown loams, developed on unconsolidated sands, silts and 
clays. (Joplin, Weld.) 
39 (Southern) light brown to gray fine sandy loams to silty clay loams, de- 
veloped on limestone or unconsolidated sands, silts, and clays. (Uvalde, 
Reagan.) 
SIEROZEM AND DESERT SOILS 
40 (Northern) gray and grayish-brown soils, developed on loess and alluvial 
fans. (Ritzville, Portneuf,) 
ti (Southern) gray, brown, and reddish soils, developed on alluvial fans. 
(Reeves, Mohave. 
SOILS OF THE PACIFIC VALLEYS 
''2 Soils too intimately associated to separate on a schematic map. (San- 
Joaquin, Fresno, Hanford.) 
INTRAZONAL AND AZONAL SOILS 
•43 Rough and mountainous. 
Largely sands, some of which are associated with bogs. (Valentine sand, 
Dune sand, etc.) 
■^s Black (or brown) friable soil underlain by chalky materials. These soils 
develop under a prairie vegetation and are known as Rendzinas (Houston, 
Sumter,) 
■46 Shallow stony soils from limestone. (Valera, Ector.) 
Marsh, Swamp and Bog. (Carlisle, Pamlico, Rifle.) 
^8 Soils developed upon lake plains. (Brookston, Maumee, Vergennes.) 
■4S Alluvial soils. (Huntington, Sharkey, Columbia, Cass.) 
so Rough broken land, including Pierre soils. 
LEGEND FOR PLANT GROWTH REGIONS 
\ 
North Pacific Coast. 
Palouse-Bitterroot Valley. 
( I 1 1 I 1 n 1 "7 
mm lo 
Central Rocky Mountains. 
18 
Northern Black Soils. 
Western Great Lakes. 
28 
Piedmont 
rTTTTTl 
2 
Willamette Valley-- Puget Sound. 
^ 8 
Snake River Plain Utah Valley. 
^ 14 
Southern Rocky Mountains. 
19 
Central Black Soils. 
rm 24 
Central Great Lakes. 
^ 29 
Upper Coastal Plain. 
3 
Central California Valleys. 
^ 9 
Great Basin - Intermontane. 
F=1 15 
Northern Great Plains. 
20 
Southern Black Soils. 
[m] 25 
Ozark -Ohio -Tennessee River Valleys 
m 30 
Swampy Coastal Plain. 
4 
Cascade ■ Sierra Nevada. 
rm 10 
Southwestern Desert. 
cm 16 
Central Great Plains. 
21 
Northern Prairies. 
^ 26 
Northern Great Lakes -St. Lawrence. 
ra 3! 
South - Central Florida. 
5 
Southern California. 
imi II 
Southern Plateau. 
Southern Plains. 
22 
Central Prairies. 
Wm 27 
Appalachian. 
32 
Subtropical Florida. 
6 
Columbia River Valley. 
Northern Rocky Mountains. 
