Table T5. Summary of stratigraphic relations at Site C0012 and correlation with equivalent units in ODP sites and IODP Site C0011. (See table note.)
| Unit | Unit name |
Core, section, interval (cm) |
Depth CSF (m) |
Thickness (m) |
Stratigraphic age |
Lithologic description |
Processes of formation |
Stratigraphic correlation | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Site 808 |
Site 1173 |
Site 1174 |
Site 1177 |
Site C0011 |
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| Top | Bottom | Top | Bottom | |||||||||||
| 322-C0012A- | 322-C0012A- | |||||||||||||
| I | Upper Shikoku Basin | 1R-1, 0 | 12R-2, 43 | 0.00 | 150.86 | 150.86 | Pleistocene–late Miocene (0 to 7.8 Ma) | Silty claystone and ash layers | Hemipelagic and air fall pyroclastic deposition | Subunit IVa | Unit II | Unit III | Unit I | Unit I |
| II | Middle Shikoku Basin | 12R-2, 43 | 19R-4, 83 | 150.86 | 219.81 | 68.95 | late Miocene (7.8–9.4 Ma) | Silty claystone and volcaniclastic sandstone | Hemipelagic settling and volcaniclastic turbidity currents in submarine fan system | NA | NA | NA | NA | Unit II |
| III | Lower Shikoku Basin hemipelagites | 19R-4, 83 | 31R-4, 74 | 219.81 | 331.81 | 112.00 | late–middle Miocene (9.4–12.7 Ma) | Silty claystone and lime mudstone | Hemipelagic settling | Subunit IVb | Unit III | Unit IV | Unit II | Unit III |
| IV | Lower Shikoku Basin turbidites | 31R-4, 74 | 40R-2, 27 | 331.81 | 418.29 | 86.48 | middle Miocene (12.7–13.5 Ma) | Silty claystone, clayey siltstone, and siltstone | Hemipelagic settling and terrigenous turbidity currents in submarine fan system | NA | NA | NA | Unit III | Unit IV |
| V | Volcaniclastic-rich | 40R-2, 27 | 52R-1, 51 | 415.58 | 528.51 | 112.93 | middle Miocene (13.5 to ≥18.9 Ma) | Silty claystone, sandstone (incl. volcaniclastic sandstone), and tuff | Hemipelagic settling, turbidity currents, and air fall pyroclastic deposition | Unit V | Unit IV | Unit V | Unit IV | Unit V |
| VI | Pelagic claystone | 52R-1, 51 | 53R-1, 31 | 528.51 | 537.81 | 9.30 | middle–early Miocene (≥18.9 Ma) | Red calcareous claystone | Pelagic settling | Unit VI | Unit V | NA | NA | NA |
| VII | Basement | 53R-1, 31 | 58R-CC | 537.81 | 576.00 | 38.19 | early Miocene (>18.9 Ma) | Basalt | Igneous/Volcanic activity | Unit VI | Unit V | NA | Unit V | NA |
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