ODP Leg 182: Great Australian Bight:

Cool Water Carbonates

Figure 8

Hole 1129D below pipe: FMS image showing the boundary between logging Units 2 and 3 which also coincides with an inflection in gamma-ray values. Chert horizons in unit 3 are imaged as resistive (bright) horizons, whereas the more conductive packstone-grainstone (Unit 3) and wackestone-packstone (Unit 2) intervals appear darker on the image.