Cambic Horizon - Soil Geography of the USA: A Diagnostic-Horizon Approach - page 128

abundant in the Mollisols (3,173), followed by the Inceptisols (2,550),
Andisols (856), Vertisols (398), and Aridisols (384). Soils with cambic horizons
comprise nearly 2 million km 2 in the USA or approximately 21 % of the total area.
These soils occur predominantly in the Appalachian Mountains, the Great Plains,
the Mississippi River valley, the Rocky Mountains, the Pacific Northwest, and the
Great Basin. The cambic horizon represents the vestigial effects of pedogenesis or
has been influenced by what has been called “pedogenic inertia.”

Acknowledgments Paul Reich kindly prepared Fig. 13.1 .

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