Figure F4. Color close-up photos. A. Alteration features in Subunit IB. Pale purple and green alteration banding is truncated by reaction halos around burrows. B. Concentric reaction halos around a burrow in Subunit IB. C. Laminated porcelanite nodule in Subunit IE. The presence of porcelanite indicates the onset of silica diagenesis (opal-A to opal-CT transition) in the lower part of the sedimentary section. D. Volcanic glass shards in laminated chalk of Subunit IE. E. Laminated nannofossil chalk in Subunit IE. The yellowish color may be due to bleaching by oxygenated seawater flowing through the oceanic basement and lower interval of the sedimentary section. F. Dark pyrite spot in Subunit IA. These spots are present throughout the hole. G. Pyrite nodule. Pyrite nodules and pyritized burrows are present at several levels of Subunit IC.

Figure F4. Color close-up photos. A. Alteration features in Subunit IB. Pale purple and green alteration banding is truncated by reaction halos around burrows. B. Concentric reaction halos around a burrow in Subunit IB. C. Laminated porcelanite nodule in Subunit IE. The presence of porcelanite indicates the onset of silica diagenesis (opal-A to opal-CT transition) in the lower part of the sedimentary section. D. Volcanic glass shards in laminated chalk of Subunit IE. E. Laminated nannofossil chalk in Subunit IE. The yellowish color may be due to bleaching by oxygenated seawater flowing through the oceanic basement and lower interval of the sedimentary section. F. Dark pyrite spot in Subunit IA. These spots are present throughout the hole. G. Pyrite nodule. Pyrite nodules and pyritized burrows are present at several levels of Subunit IC.