A soil horizon is a layer of soil approximately parallel to the land surface with morphological properties different from layers below and/or above it. Horizons can be described in the field by a pedologist from a pit, core or exposure.
White, A, Sparrow, B., Leitch, E., Foulkes, J., Flitton, R., Lowe, A.J., Caddy-Retalic, S. (2012). AusPlots Rangelands Survey Protocols Manual. Version 1.2.9 page 50. Terrestrial Ecosystem Research Network and The University of Adelaide Press. https://doi.org/10.25901/5f2ca309cc9c2
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