Labeled subunits in Worland Limestone

Worland Limestone on the east side of I-170. The well-bedded, hard gray limestone in
the lower part of the member (close-up 1) is overlain by softer, clayey, yellow-weathering
limestone (close-up 2). At the top is chunky, grayish purple to yellowish gray rooted
limestone (close-up 3). The grayish purple color was produced during oxidation of
carbonaceous material in the root molds. Above that the roots are open, probably as
a result of modern weathering. The yellow weathering zone is crossed by diagonal
compactional microfaults that die out above and below. These reflect its relatively
clay-rich composition.

View close-up 1
View close-up 2
View close-up 3

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