Geoscience Reference
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Fig. 23.1 A landform and soil derived from the New Idria Formation (ultramafic materials, Coast
Range, central California) (Photos by Dr. R. Graham)
with two or fewer soil series each in Ultisols, Vertisols, Entisols, Aridisols, and
Oxisols. Ultramafic soils are present
in 18 suborders, 24 great groups, and
40 subgroups.
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