Figure F32. Photomicrographs of bedding-parallel shear zone showing R shears and sense of slip (Sample 319-C0009-5R-6, 73.0–75.5 cm). Stratigraphic up is top of page. A. Shear zone has a discrete fine-grained layer where most shearing occurs. R shear orientation suggests a sinistral sense of slip for entire shear zone. Small angle between primary shear and R shear because of core face being oblique to true dip direction. B. Discrete shear zones and location of C. C. Primary shear zone is oblique to an R shear that has two fractured grains. Orientation of R shear suggests a sinistral sense of slip.
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