Carbonate microfossils, especially foraminifers, were strongly affected by overgrowths, cementation, and recrystallization below 60 to 100 mbsf, effects consistent with the pore-water geochemistry and the onset of lithification. One main Pleistocene upper bathyal assemblage of benthic foraminifers is recognized above 100 mbsf. Poor preservation prevented detailed faunal analysis below 100 mbsf. Magnetic measurements of archive-half cores established a magnetostratigraphy to a depth of 320 mbsf, which includes the Brunhes and uppermost Matuyama epochs. Below this, drilling disturbance disrupted the record and no further magnetostratigraphic data were obtained.
Magnetic susceptibility is dominated by contributions from the diamagnetic carbonate matrix.
Composite section construction from Holes 1131A and 1131B indicates that a continuous record was not recovered. Below 70 mbsf, low recovery from XCB cores resulted in reduced core overlap and prohibited splicing below 78 mcd. The primary parameters used for correlation were natural gamma-ray emissions, GRA bulk density, and color reflectance. Comparison of data between holes revealed a low degree of similarity, making correlations difficult. In comparison to Site 1127, gas pockets were less abundant, and the concentration of C1 in both gas pockets and headspace samples at Site 1131 was lower.