Fragipan Soils of Illinois: II. Mineralogy in Reference to Parent Material Uniformity of Hosmer Silt Loam
1959
Grossman, R. B. | Stephen, I. | Fehrenbacher, J. B. | Beavers, A. H. | Parker, J. M.
The mineralogy of Hosmer silt loam, a bisequal soil with a fragipan, was investigated in order to determine whether there is a lithological discontinuity between the parent material of the upper and lower sequum. Differences observed between the two sequa in respect to the mineralogy of the heavy and light, silt-size fractions may be accounted for by a progressive decrease in the weathering intensity with depth and are not suggestive of a lithological discontinuity in parent material. The clay mineralogy for the B horizons of the two sequa was similar for the < 0.2µ and the 0.2µ to 2.0µ fractions, taken individually. However, for the total clay fraction, a higher percent of montmorillonite was found in the B′₂ horizon of the lower sequum; this may be explained on the basis of illuviation.
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