Figure F3 (continued). E. Smith 9 inch tricone bit used for Run 7 to successfully clear the obstructed interval at 922–923 mbsf and work several ledges before reaching the bottom of the hole on the morning of 1 May. The bit was slightly out of gauge after 32.8 h of use. F. The worn core catcher used during Run 9, the first coring run of Expedition 335. As drilling continued for ~10 h with a destroyed bit (G, H), the core catcher was in contact with metal/junk and/or rocks; it is ~1 cm shorter than the new core catcher on the right. G, H. Remains of the Ulterra C9 rotary core barrel coring bit used during Run 9. The bit was probably used for ~10 h after it disintegrated, which resulted in this spectacularly abraded and sculptured bit (“Stumpy”), something never seen before by the drillers. (Continued on next page.)
Previous | Close | Next | Top of page