Figure F4. A. Close-up photograph of light-colored crumbly authigenic carbonate observed in Sample 204-1246B-1H-3, 38-45 cm. B. Smear slide photomicrograph (crossed nicols; Sample 204-1246B-1H-3, 40 cm) from the carbonate above. Note the tabular calcite crystals of high birefringence.

Figure F4. A. Close-up photograph of light-colored crumbly authigenic carbonate observed in Sample 204-1246B-1H-3, 38-45 cm. B. Smear slide photomicrograph (crossed nicols; Sample 204-1246B-1H-3, 40 cm) from the carbonate above. Note the tabular calcite crystals of high birefringence.