Glossary of "Evolution of Plants (2nd ed.)" by Willis & McElwain (2014)
- Soil deposits consisting mainly of the ores of aluminium oxides, which are particularly prevalent in tropical and subtropical climates with seasonal precipitation.
- Willis, K. J. & McElwain, J. C. 2014. The Evolution of Plants, 2nd ed. -ix + 398 pp. Oxford University Press, Oxford.