Table 1. Biogenic opal concentrations for a latitudinal transect of seven Leg 167 sites along the California margin.

Hole	Core	Type	Sect.	Interval (cm)	Depth (mbsf)	Offset (m)	Depth (mcd)	Age (Ma)	Opal (%)
1010C	6	H	1	34-36	43.84	5.78	49.62	4.283	9.98
1010C	6	H	1	110-112	44.60	5.78	50.38	4.343	8.42
1010C	6	H	2	34-36	45.37	5.78	51.15	4.404	8.94
1010C	6	H	2	110-112	46.13	5.78	51.91	4.464	10.82
1010C	6	H	3	34-36	46.87	5.78	52.65	4.539	9.79
1010C	6	H	3	110-112	47.63	5.78	53.41	4.621	9.72
1010C	6	H	4	36-38	48.39	5.78	54.17	4.704	11.94
1010C	6	H	4	110-112	49.13	5.78	54.91	4.784	11.02
1010C	6	H	5	34-36	49.87	5.78	55.65	4.846	11.32
1010C	6	H	5	110-112	50.63	5.78	56.41	4.906	10.40
1010C	6	H	6	35-37	51.38	5.78	57.16	4.964	10.45
1010C	6	H	6	110-112	52.13	5.78	57.91	5.028	10.53

Notes: Both the standard Ocean Drilling Program meters below seafloor (mbsf) depth scale and shipboard meters composite depth (mcd) scale are presented here. The offset column denotes the amount (in meters) each sample was shifted to align samples between different holes (see the "Explanatory Notes" chapter in Lyle, Koizumi, Richter, et al. [1997] for details on the mcd scale and composite core construction). Ages are linearly interpolated between magneto- and biostratigraphic tie points presented in Ravelo et al. (1997).