This photo, taken in the White Cliffs area along the Missouri River in central Montana, shows a friend standing near a concretion. Concretions are typically formed in sandstone such as the Eagle sandstone (Cretaceous age), which makes up the cliffs here as well as those along the Yellowstone River in the Billings area, including the "Rimrocks". Watch the short presentation below to see how differential weathering exposes them. To learn much more about how concretions form,
CLICK HERE.
See more photos from our October trip through the White Cliffs.
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