Figure F10. Photomicrograph showing the lithology of white, variably porous rudstone to floatstone just below the tightly cemented uppermost zone of Subunit IIIA (Sample 194-1193A-6X-CC, 46 cm; 37.6 mbsf). A partly dissolved bivalve shell fragment (M) is encrusted by bryozoans (Y) and underlain by a shelter pore that shows geopetal fabric with partial filling by micritic mud (A) followed by coarser-grained material (B) interpreted as crystal silt. The latter feature is evidence for vadose diagenetic conditions.

Figure F10. Photomicrograph showing the lithology of white, variably porous rudstone to floatstone just below the tightly cemented uppermost zone of Subunit IIIA (Sample 194-1193A-6X-CC, 46 cm; 37.6 mbsf). A partly dissolved bivalve shell fragment (M) is encrusted by bryozoans (Y) and underlain by a shelter pore that shows geopetal fabric with partial filling by micritic mud (A) followed by coarser-grained material (B) interpreted as crystal silt. The latter feature is evidence for vadose diagenetic conditions.