Table 1. Biostratigraphic datum events observed at the three Blake Ridge Sites 994, 995, and 997.

			Hole 994C			Hole 995A			Hole 997A
Nannofossil event	Zonal boundary	Age (Ma)	Range (cm)	Interval (mbsf)		Range (cm)	Interval (mbsf)		Range (cm)	Interval (mbsf)
FO E. huxleyi	CN15/CN14b	0.26	2H-3, 65 to 2H-4, 15	8.05-9.05		2H-6-70 to 2H-CC-41	9.90-10.96		2H-3, 39 to 2H-3-114	6.29-7.04
LO P. lacunosa	CN14b/CN14a	0.46	3H-4, 64 to 3H-5, 14	19.04-20.04		3H-6-20 to 3H-6-120	19.00-20.00		3H-1, 114 to 3H-2-39	13.54-14.29
LO R. asaoi		0.83*	5H-1, 14 to 5H-1, 114	33.04-34.04		6H-1-30 to 6H-1-130	40.00-41.00		5H-2, 114 to 5H-3-39	34.04-34.79
RE medium Gephyrocapsa	CN14a/CN13b	1.03	6H-5, 94 to 6H-6, 44	49.04-50.04		6H-5-130 to 6H-6-80	47.00-48.00		6H-3, 114 to 6H-4-39	45.04-45.79
LO large Gephyrocapsa		1.22-1.24	8H-2, 24 to 8H-2, 74	63.14-63.64		8H-2-108 to 8H-3-108	61.28-62.78		6H-4, 114 to 6H-5-39	46.54-47.29
FO large Gephyrocapsa		1.46-1.48	10H-CC, 40 to 11H-1, 44	81.40-81.84		10H-CC-36 to 11H-2-69	79.47-80.09		8H-2, -114 to 8H-3-49	55.54-56.39
LO C. macintyrei		1.59	11H-4, 44 to 11H-5, 44	86.34-87.84		11H-4-108 to 11H-5-108	84.28-85.78		9H-2, 114 to 9H-3-49	64.04-64.89
FO medium Gephyrocapsa***	CN13b/CN13a	1.67-1.70	12H-1, 64 to 12H-2, 65	91.54-93.05		12H-2-104 to 12H-3-108	89.67-91.21		10H-1, 114 to 10H-2-49	72.04-72.79
LO D. brouweri	CN13a/CN12d	1.95	13H-4, 44 to 13H-5, 44	105.34-106.84		13H-7-8 to 13H-CC-15	106.88-107.84		10H-CC to 11H-1-49	80.40-80.89
LO D. pentaradiatus	CN12d/CN12c	2.46-2.56	16H-6, 77 to 16H-7, 77	137.17-138.67		16H-2-8 to 16H-4-5	128.28-129.75		13H-CC, 1 to 14H-2-114	108.90-110.37
LO D. surculus	CN12c/CN12b	2.55-2.59	17H-6, 50 to 17H-7, 50	146.39-147.89		16H-8-8 to 17H-1-8	135.78-135.78		15H-2, 114 to 15H-4-49	121.04-123.39
LO D. tamalis	CN12b/CN12a	2.78	20X-CC, 20 to 21X-1, 77	164.80-165.57		19H-7-108 to 20H-1-8	155.66-155.78		19H-5, 114 to 19H-6-49	154.37-155.22
LO Sphenolithus spp.		3.65	32X-1, 77 to 32X-CC, 30	261.67-263.36		35X-4-8 to 35X-CC-19	295.28-296.19		38X-5, 30 to 38-CC	304.80-306.25
LO R. pseudoumibilica	CN12a/CN11b	3.75	34X-CC, 0 to 35X-1, 0	280.42-289.80		38X-1-22 to 38X-6?	310.22-319.?		41X-CC to 42X-1-30	326.48-327.70
FCO D. asymmetricus	CN11b/CN11a	4.2	40X-CC, 20 to 41X-1, 77	330.30-338.67		39X-1-10 to 39X-CC-57	319.70-322.60		42X-CC to 43X-1-30	331.27-337.31
LO Amaurolithus spp.		4.4**	41X-CC, 22 to 42X-2, 77	347.06-349.87		39X-CC-57 to 40X-1-30	322.60-329.60		42X-CC to 43X-1-30	331.27-337.31
FO C. rugosus	CN10c/CN10b	5.0	52X-CC, 27 to 54X-1, 77	428.61-435.87		56X-2-9 to 56X-2-109	456.09-457.09		52X-CC, 1 to 54X-1-28	414.13-423.99
FO C. acutus	CN10b/CN10a	5.34	67X-1, 78 to 67X-4, 76	541.88-546.21		68X-CC-27 to 69X-1-8	569.91-570.08		14X-3, 31 to 14X-4-29	494.13-495.90
LO D. quinqueramus	CN10a/CN9d	5.6	72X-1, 77 to 72X-2, 77	579.27-580.77		69X-CC-22 to 71X-1-8	573.86-580.68		20X-CC to 22X-1-40	545.43-560.20
LO A. amplificus	CN9d/CN9c	5.9	74X-CC, 17 to 75X-1, 76	603.63-608.16		76X-CC-30 to 77X-1-18	629.62-637.48		26X-3, 30 to 26X-4-30	581.90-583.40