Rhizocretions of iron oxide near top of varicolored claystone

The upper greenish gray portion of the varicolored claystone here
contains isolated root structures marked by solid concentrations of
iron oxide called "rhizocretions" (arrows). The rooting may have
been associated with deposition of the overlying carbonaceous
Mulberry Member (medium to dark gray claystone visible at top of
the photo). Rhizocretions at the far right seem to extend down from
the Mulberry.

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