Table T15. Linear sedimentation rates and mass accumulation rates, Hole 1258A.
Epoch
Core, section,
interval (cm)
Top Bottom
Thickness
(m)
Duration
(m.y.)
DBD
(g/cm3)
MAR
(g/cm2/k.y.)
Main lithology
Depth
(mbsf)
Age
(Ma)
Depth
(mbsf)
Age
(Ma)
LSR
(m/m.y.)
(cm/k.y.)

207-1258A-







Neogene 1R-1, 0, to 1R-CC, 0 0
4.98 11.7 4.98
0.92
Nannofossil ooze
middle Eocene–late Paleocene 2R-CC, 0, to 26R-CC, 0 11.43 45.2 245.32 60.9 233.89 15.7 15
1.5
1.14
1.7
Nannofossil chalk
early Paleocene 27R-1, 0, to 27R-CC, 0 245.30 64.5 252.58 65.2 7.28 0.7 10
1.0
1.45
1.5
Nannofossil chalk
Maastrichtian–Campanian 27R-CC, 0, to 41R-CC, 0 252.58 65.2 385.45 79 132.87 13.8 10
1.0
1.55
1.6
Nannofossil chalk
Turonian–Albian 42R-CC, 0, to 50R-CC, 0 399.35 83 446.22 101.7 46.87 18.7 3
0.3
None
Organic-rich limestone

Notes: Averaged dry bulk densities (DBD) of major lithologies per studied interval were used (see "Physical Properties") to calculate mass accumulation rate (MAR) values. LSR = linear sedimentation rate. — = not assigned.