Argillic, Kandic, and Natric Horizons - Soil Geography of the USA: A Diagnostic-Horizon Approach - page 90

Fig. 11.1 Examples of soils with an argillic ( upper left ; Photo by A.E. Hartemink), kandic ( upper
right ), and natric ( lower left )
“texture-contrast” soils. A lamella is defined as “an illuvial horizon less than 7.5 cm
thick, which contains an accumulation of oriented silicate clay on or bridging
sand and silt grains” and has more silicate clay than the overlying eluvial horizon
(Soil Survey Staff 2010 , p. 18). Lamellae are often formed in dunes when the sand
contains small amounts of clay but are not restricted to these conditions.