Table T3. Summary of diatom and radiolarian biostratigraphic datums recognized and calibrated ages for each datum event, Hole 1166A.
Upper sample | Lower sample | Event | Taxon | Constraint | Calibrated age (Ma) |
|||
---|---|---|---|---|---|---|---|---|
Core,
section, interval (cm)
|
Interval
depth
(mbsf) |
Core,
section, interval (cm)
|
Interval
depth
(mbsf) |
|||||
Diatoms: | ||||||||
188-1166A- | 188-1166A- | |||||||
1R-CC | 3.02 | 13R-1, 70-71 | 114.00 | LO | Actinocyclus ingens | < | 0.66 | |
1R-CC | 3.02 | 13R-1, 70-71 | 114.00 | LO | Thalassiosira kolbei | > | 1.8-2.0 | |
13R-1, 80-83 | 114.10 | 13R-1, 124-126 | 114.54 | LO | Thalassiosira vulnifica | > | 2.2-2.3 | |
13R-2, 65-67 | 115.45 | 13R-CC | 117.25 | FO | Thalassiosira vulnifica | < | 2.8-3.2 | |
13R-CC | 117.25 | 14R-CC | 131.88 | FO | Thalassiosira elliptipora | < | 3.2 | |
13R-CC | 117.25 | 15R-3, 18-19 | 135.73 | LO | Hemiaulus caracteristicus | > | ~33 | |
17R-2, 58-59 | 153.48 | — | — | LO (absence) | middle Eocene taxa | < | ~37 | |
Radiolarians: | ||||||||
188-1166A- | 188-1166A- | |||||||
— | 0.00 | 1R-2, 72-73 | 2.22 | LO | Pterocanium c. trilobum | < | 0.83 | |
— | 0.00 | 1R-2, 72-73 | 2.22 | LO | Cycladophora pliocenica | < | ~1.35 | |
1R-2, 72-73 | 2.22 | 13R-1, 150-151 | 114.77 | FO | Lithelium nautiloides | > | 1.93 | |
1R-2, 72-73 | 2.22 | 13R-1, 150-151 | 114.77 | FO | Triceraspyris antarctica | > | 1.93 | |
1R-2, 72-73 | 2.22 | 13R-1, 150-151 | 14.77 | LO | Antarctissa strelkovi | < | ~2.4 | |
13R-2, 5-6 | 114.83 | — | — | FO | Antarctissa strelkovi | > | ~6.1 |
Notes: Sample designations and depths in bold type represent the occurrence of each taxon, and plain type represents sample-spacing uncertainty for each datum. LO = last occurrence, FO = first occurrence. — = upper or lower interval not recognized because of poor preservation or absence.