@article{rebertus_buol_1985, title={INTERMITTENCY OF ILLUVIATION IN DYSTROCHREPTS AND HAPLUDULTS FROM THE PIEDMONT AND BLUE RIDGE PROVINCES OF NORTH-CAROLINA}, volume={36}, ISSN={["0016-7061"]}, DOI={10.1016/0016-7061(85)90008-4}, abstractNote={Abstract Dystrochrepts and Hapludults formed from mica gneiss and schist in the Piedmont and Blue Ridge Provinces of North Carolina have a range of illuvation cutan orientation patterns that is related to various indicators of soil development (clay content, solum thickness, and degree of primary mineral alteration). The relationship of cutan orientation patterns to soil development in these soils suggests that clay illuviation is largely intermittent in occurrence. Lessivage occurs in Typic Dystrochrepts, the soils showing the least morphological development, but because of the thinness and coarse texture of the sola the major areas of accumulation may occur beneath the cambic horizons in vertical cracks in the structurally rigid, isovolumetrically weathered saprolite. The source of clay is relatively easily weathered plagioclase. Few illuviation cutans are present in argillic horizons of fine-loamy Hapludults. Evidence of illuvial clay is lacking because biotite is being altered to sand- and silt-sized pseudomorphs of kaolinite with little production of clay-sized particles. Once the biotite is entirely kaolinized, comminution of the sand- and silt-sized kaolinite grains supplies clay for clayey argillic horizons to evolve. Soils at this stage of development have abundant illuviation cutans with strong continuous orientation. After the silt- and sand-sized kaolinite has been comminuted the only primary minerals remaining in any abundance to produce clay-sized particles are relatively resistant muscovite and microcline. Iron continues to concentrate as the clayey Hapludults develop, masking the anisotropy of the illuviation cutans. The increasing lack of distinctness of cutans and their apparent low degree of orientation with increasing degree of soil development indicate that illuviation has largely ceased in the most developed clayey Hapludults and the illuvial features are for the most part relict features of an earlier period of clay production.}, number={3-4}, journal={GEODERMA}, author={REBERTUS, RA and BUOL, SW}, year={1985}, month={Dec}, pages={277–291} }
 @article{rebertus_buol_1985, title={IRON DISTRIBUTION IN A DEVELOPMENTAL SEQUENCE OF SOILS FROM MICA GNEISS AND SCHIST}, volume={49}, ISSN={["0361-5995"]}, DOI={10.2136/sssaj1985.03615995004900030037x}, abstractNote={AbstractUpland residual soils formed from mica gneiss and schist in the Piedmont and Blue Ridge provinces of North Carolina represent developmental sequences where particle‐size class, profile development, and mineralogy are related to landscape position and slope. In this study the distribution of total and free iron in 10 Hapludult and Dystrochrept pedons is examined and interpreted with respect to degree of profile development. Primary mineral alteration and B horizon free iron/total iron ratios vary nearly systematically with particle‐size class and solum thickness. The latter two parameters were found to be good indicators of degree of profile development and hence of relative soil age. The free iron/total iron ratio was found to be a particularly sensitive indicator of relative soil development. The ratio reflects the degree of primary mineral alteration, the amount of clay formed, as well as the pedogenic process of illuviation. The B horizon ratios are much better indicators of relative soil development than those from either C or A horizons. Ratios of free iron/total iron in A horizons are influenced by downslope movement of surficial material, the low extractability of iron oxides of large particle size, and clay content differences. Free iron/total iron ratios of C horizons are dependent on sampling depth, the amount of clay formed, and the degree of illuviation that has occurred below the solum. All soils had oxidic ratios (%Fe2O3 + %gibbsite/%clay) > 0.2; however, all but one was excluded from the oxidic mineralogy class due to having >40% mica. A simple free iron/total iron ratio in B horizons, which is systematically related to the degree of weathering of primary minerals and the degree of morphological soil development, better serves as soil family criteria than the present % Fe2O3 + % gibbsite/% clay.}, number={3}, journal={SOIL SCIENCE SOCIETY OF AMERICA JOURNAL}, author={REBERTUS, RA and BUOL, SW}, year={1985}, pages={713–720} }
 @book{bruck_robarge_reynolds_rebertus_pye_haley_1984, title={Observations of boreal montane decline in the Southern Appalachian Mountains: Soil and vegetation studies (NAPAP peer review document)}, institution={U.S. Environmental Protection Agency}, author={Bruck, R. I. and Robarge, W. P. and Reynolds, K. M. and Rebertus, R. and Pye, J. and Haley, K.}, year={1984} }