Root molds (side view) at top of Worland Limestone

Side view close-up of open root molds at the top of the Worland
Limestone (see the accompanying top view of the bedding surface).
The amount of clayey carbonaceous material remaining in the root
molds increases with depth. At the top, organic matter has been
completely oxidized and the clays have slaked away due to modern
weathering. The remaining fill of root molds is grayish purple, and
imparts a slight purplish hue to the whole rock (see slab).

View top of bedding surface

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