Edge of algal mound in Worland Limestone
A slight bluish tint at the level of the hammer shows
a concentration of
platy and encrusting calcareous algae near the edge of an ancient algal
mound. This exposure is just north of the I-70 overpasses on the east
side of I-170. A portion of the yellow-weathering zone is visible at the
top of the photograph.
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