Cambic Horizon - Soil Geography of the USA: A Diagnostic-Horizon Approach - page 125

Table 13.2 (continued)
Order Suborder Great groups No. of soil series

Gelepts Dystrogelepts 4

Eutrogelepts 10

Udepts Dystrudepts 464

Eutrudepts 240

Humudepts 145

Ustepts Dystrustepts 20

Haplustepts 263

Humustepts 6

Xerepts Dystroxerepts 185

Haploxerepts 221

Humixerepts 58

Total 2,550

Mollisols Aquolls Cryaquolls 69

Endoaquolls 525

Epiaquolls 42

Haplaquolls 2

Cryolls Haplocryolls 291

Rendolls Cryrendolls 6

Haprendolls 16

Udolls Hapludolls 466

Ustolls Haplustolls 728

Xerolls Haploxerolls 1,028

Total 3,173

Vertisols Aquerts Dystraquerts 12

Endoaquerts 22

Epiaquerts 49

Cryerts Haplocryerts 2

Humicryerts 1

Torrerts Haplotorrerts 29

Uderts Dystruderts 15

Hapluderts 55

Usterts Haplusterts 137

Xererts Haploxererts 76

Total 398

Grand total 7,599

13.4 Distribution of Soils with Cambic Horizons

Soils with cambic horizons comprise nearly 2 million km 2 in the USA or
approximately 21 % of the total area (Fig. 13.1 ). These soils occur predominantly
in the Appalachian Mountains (Inceptisols), Great Plains and Great Basin
(Mollisols), the Rocky Mountains and Coast Range (Inceptisols), eastern TX and