Pedoturbation in varicolored claystone unit

Close-up of the varicolored claystone--an ancient soil zone, or "paleosol."
Note the complete lack of bedding features. The color mottling results from
"pedoturbation"--the repeated rooting action by plants. Especially
prominent greenish gray and purplish gray root mottles lie just to the
right of the hammer. These penetrate maroon material, and are lined
by yellow in their upper portions.

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