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)

## Format

An object of class list of length 4.

## References

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.