A database of formative elements used by the first 4 levels of US Soil Taxonomy hierarchy (soil order, suborder, greatgroup, subgroup).
data(ST_formative_elements)
An object of class list
of length 4.
S. W. Buol and R. C. Graham and P. A. McDaniel and R. J. Southard. Soil Genesis and Classification, 5th edition. Iowa State Press, 2003.