Figure 7. Late Paleocene thermal maximum (LPTM) as observed in selected downhole measurements at Site 1001. The log response at 240.8 mbsf is consistent with the recovered claystone interval that contains the negative 13C excursion marking the LPTM. The location of onset and termination of magnetochron C24r is also determined by downhole measurements (i.e., GHMT, V. Louvel and B. Galbrun, unpubl. data). The best estimate for the onset of the LPTM is 55.542 Ma, assuming a sedimentation rate of 37.4 m/m.y. based on nannofossil identification (Sigurdsson, Leckie, Acton, et al., 1997) and employing the Cande and Kent (1995) time scale. Note the distinct difference in resistivity above and below the LPTM and the short transition to lower resistivities prior to the LPTM.