Table T7. Summary of coring bits used during Expedition 309.
| Bit | Manufacturer | Serial number |
Bit type | Size | Number of cores |
Cored interval (m) |
Core recovered (m) |
Recovery (%) |
Coring time (h) |
Rate of penetration (m/h) |
|---|---|---|---|---|---|---|---|---|---|---|
| Log bit | Logging | 43.8 | ||||||||
| 1256D-1 | RBI | BF-739 | C-9 | 9⅞ | 11 | 69.1 | 25.20 | 36.5 | 51.7 | 1.34 |
| 1256D-2 | RBI | BF-852 | C-9 | 9⅞ | 11 | 76.8 | 18.02 | 23.5 | 52.1 | 1.47 |
| 1256D-3 | RBI | BF-854 | C-9 | 9⅞ | 11 | 61.1 | 14.85 | 24.3 | 52.8 | 1.16 |
| 1256D-4 | RBI | BF-856 | C-9 | 9⅞ | 4 | 20.4 | 9.52 | 46.7 | 17.8 | 1.14 |
| 1256D-5 | RBI | BF-858 | C-9 | 9⅞ | 15 | 72.1 | 20.56 | 28.5 | 50.1 | 1.44 |
| 1256D-6 | RBI | BF-741 | C-9 | 9⅞ | 12 | 57.6 | 21.45 | 37.2 | 50.8 | 1.13 |
| 1256D-7 | RBI | BF-742 | C-9 | 9⅞ | 8 | 36.3 | 17.70 | 48.8 | 42.5 | 0.85 |
| 1256D-8 | RBI | BF-853 | C-9 | 9⅞ | 12 | 58.6 | 17.74 | 30.3 | 57.8 | 1.01 |
| 1256D-9 | RBI | CL-540 | C-9 | 9⅞ | 12 | 51.3 | 37.57 | 73.2 | 53.1 | 0.97 |
| Log bit | Logging | 76.0 | ||||||||
| Totals: | 96 | 503.3 | 182.61 | 1.17 | ||||||
Note: RBI = Rock Bit International.
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