Abstract
Micromorphological studies of two residual soils have revealed a constant mineralogy with depth in each soil and maximum cutan development in the B horizon. Electron microprobe analysis has shown iron, titanium, and carbon in all of the cutans. Calcium was present in the cutans around feldspar grains in the Methuen, a soil derived from granite gneiss, but was not present in the cutans around quartz grains. The inner layer of the grain cutans consisted of iron and titanium, the outer layer having in addition silica and aluminum. These latter elements were indicators of clay minerals. Microprobe analysis of mica grains indicated losses of magnesium and potassium from the mica in the A horizons of both soils compared with the levels of these elements present in the mica in the C1 horizons.

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