English: Thin section image of a sheared cataclasite in both plane polars (right) and crossed polars (left). Very highly fractured quartz and feldspar wall rock (right half of image). Contact outlined in red. Cataclasite (left half of image) is generally clast supported with rounded to subangular grains of quartz and feldspar within an optically opaque matrix (light brown on right to black on left). Core sample taken from the San Andreas Fault at Elizabeth Lake, CA.