Table T2. Lithostratigraphic unit boundaries, Site 1258.
Unit/
subunit
Core, section,
interval (cm)
Depth
(mbsf)
Core, section,
interval (cm)
Depth
(mbsf)
Core, section,
interval (cm)
Depth
(mbsf)

207-1258A-
207-1258B-
207-1258C-
I–IIA 2R-3, 42 8.52 1R-4, 111 5.61 Drilled, boundaries not cored
IIA–IIB 26R-4, 15 240.15 25R-6, 12 241.32 Drilled, boundaries not cored
IIB–IIC 28R-3, 20 258.10 28-CC, base 260.26 12R-7, 45 263.58
IIC–III 34R-4, 128 318.58 36R-1, 55 330.65 Drilled, boundaries not cored
III–IV 42R-1, 0 389.80 44R-2, 51 394.67 15R-3, 96 393.73
IV–V 50R-2, 30 444.06 56R-CC, base 454.09 27R-2, 65 449.56
base of V 50R-3, 103 446.22 57R-CC, 15 458.90 34R-3, 117 484.87

Notes: I = nannofossil ooze with foraminifers, IIA = nannofossil chalk with foraminifers, IIB = calcareous chalk with foraminifers, IIC = nannofossil chalk with foraminifers, III = calcareous nannofossil clay (clayey nannofossil chalk with organic matter), IV = laminated shale/limestone, V = phosphoritic calcareous clay with organic matter. — = not applicable.