RED SOILS OF EAST TEXAS DEVELOPED IN GLAUCONITIC SEDIMENTS

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Abstract
Two red soils of East Texas, the Nacogdoches and Magnolia series, were characterized chemically, physically and mineralogically. Unusually high contents of free iron were found, with as much as 45% in one Nacogdoches soil profile. The <0.2[mu] fraction of these soils is composed primarily of tabular halloysite. The free iron and tabular halloysite evidently are weathering products of the glauconitic parent material. Based upon the close association of these soils in the field and their relatively high contents of free iron and similar large abundance of tabular halloysite, it is concluded that they are genetically related.

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