Rhizomorphs in maroon portion of varicolored claystone

Maroon zone in the varicolored claystone unit. This zone has generally
smaller yellowish orange root mottles than above. They are bordered
by drab halos (see close-up) where the iron minerals were removed by
leaching. Patches of bluish gray show where clay containing reduced
iron minerals was "piped" down from higher in the soil profile through
passageways formerly occupied by large roots. Iron minerals were
apparently leached away (while in the reduced state) from the light
greenish gray patch several centimeters to the right of the pick handle.

View close-up


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