Fusulinids exposed in yellow weathering subunit of Worland Limestone

This limestone bedding surface in lower part of the yellow-weathering
zone in the Worland Limestone reveals numerous fusulinid forams.
The arrow points to a chonetid brachiopod, and a single echinoid spine
lies to the upper right of the brachiopod. There is a slight but distinct
tendency for certain clusters of fusulinids to display preferential
orientations. For example, in the major group about two centimeters
above the chisel, most of the fusulinids trend more or less horizontally
across the photograph, although two near the middle of the group lie
at a high angle to the majority. The reason for preferential orientations
is unclear (but see additional discussions with the thin section and slab
photos).

View thin section
View polished slab


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