Table T4. Characteristic diatom species in select light–dark lamination couplets. (See table notes.)
| Light laminae | Dark laminae | ||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Core, section, interval (cm) |
Depth (mbsf) |
Abundance/ Preservation |
Characteristic assemblage | Color |
Core, section, interval (cm) |
Depth (mbsf) |
Abundance/ Preservation |
Characteristic assemblage | Color |
| 318-U1357A- | 318-U1357A- | ||||||||
| 1H-3, 50 | 3.50 | A/G | Chaetoceros dichaeta (C), Eucampia antarctica resting form (terminal and intercalary) (F), Fragilariopsis curta (A), F. kerguelensis (A), F. rhombica (C), Proboscia inermis (C), Pseudonitzschia turgidula (C), Rhizosolenia antennata var. antennata (R), R. antennata var. semispina (C), R. simplex (C) | 1H-3, 51 | 3.51 | A/G | Actinocyclus actinochilus (F), Asteromphalus spp. (F), Chaetoceros spp. resting spores (C), F. curta (A), F. kerguelensis (C), F. obliquecostata (F), F. rhombica (C), F. ritscheri (F), F. sublinearis (C), Shionodiscus gracilis (C), Thalassiosira antarctica (F), T. lentiginosa (F) | ||
| 2H-4, 86 | 12.97 | A/G | C. dichaeta (C), Chaetoceros spp. RS (A), E. antarctica resting (intercalary) (F), F. curta (A), F. kerguelensis (F), F. obliquecostata (F), F. rhombica (A), F. ritscheri (F), F. sublinearis (F), Proboscia alata (F), Proboscia inermis (F), R. antennata var. semispina (F), R. simplex (F), Thalassiothrix antarctica (C) | 2H-4, 82 | 12.93 | A/M-G | Chaetoceros criophilus (C), C. dichaeta (F), Chaetoceros spp. RS (C), E. antarctica resting (intercalary) (F), F. curta (A), F. kerguelensis (F), F. obliquecostata (F), F. rhombica (F), F. ritscheri (F), F. sublinearis (F), P. inermis (F), R. antennata var. semispina (F), S. gracilis (C), Thalassiothrix antarctica (C) | ||
| 3H-5, 148.5 | 24.60 | A/G | C. dichaeta (C), Chaetoceros spp. RS (C), E. antarctica resting (R), E. antarctica vegetative (R), F. curta (A), F. kerguelensis (F), F. obliquecostata (F), F. rhombica (A), F. sublinearis (F), S. gracilis (F), Thalassiothrix antarctica (C) | 3H-5, 147.5 | 24.59 | A/M-G | A. actinochilus (R), C. dichaeta (F), F. curta (A), E. antarctica resting (C), F. kerguelensis (A), F. obliquecostata (F), F. rhombica (F), F. ritscheri (F), F. sublinearis (F), T. lentiginosa (F), T. tumida (F) | ||
| 5H-5, 82 | 42.42 | A/G | C. dichaeta (A), Chaetoceros spp. RS (A), F. curta (A), F. kerguelensis (C), F. obliquecostata (F), F. rhombica (C), F. sublinearis (C), S. gracilis (F), Thalassiothrix antarctica (C) | 5H-5, 84 | 42.44 | A/G | A. actinochilus (R), Chaetoceros spp. RS (A), E. antarctica resting (F), F. curta (A), F. kerguelensis (C), F. obliquecostata (C), F. rhombica (C), F. ritscheri (C), F. sublinearis (C), Porosira glacialis (F), S. gracilis (C), Thalassiosira antarctica (C), T. lentiginosa (F), T. tumida (F) | ||
| 7H-1, 21 | 55.31 | A/G | E. antarctica vegetative (A), F. curta (C), F. ritscheri (F), F. obliquecostata (F), F. sublinearis (A), Porosira glacialis (F), R. antennata var. semispina (C) | 7H-1, 21.5 | 55.32 | A/M | E. antarctica resting (F), F. curta (C), F. kerguelensis (C), F. obliquecostata (F), F. ritscheri (F), F. rhombica (F), F. separanda (F), F. sublinearis (C), P. glacialis (C), S. gracilis (F), Thalassiosira antarctica (C), T. lentiginosa (F) | ||
| 9H-1, 68 | 74.78 | A/G | C. criophilus (F), C. dichaeta (C), Chaetoceros spp. RS (C), F. curta (A), F. kerguelensis (A), F. obliquecostata (C), F. ritscheri (C), F. rhombica (A), F. sublinearis (F), R. antennata var. semispina (C), Thalassiosira antarctica (C), T. lentiginosa (F), Thalassiothrix antarctica (C) | 9H-1, 72 | 74.82 | A/M–G | Actinocyclus actinochilus (F), Chaetoceros spp. RS (A), E. antarctica resting (F), F. curta (A), F. kerguelensis (C), F. obliquecostata (F), F. ritscheri (F), F. rhombica (A), F. sublinearis (F), Odontella spp. (X), R. antennata var. semispina (C), S. gracilis (C), Thalassiosira antarctica (C), T. lentiginosa (F) | ||
| 13H-7, 21 | 119.96 | A/G | C. dichaeta (F), F. curta (A), F. kerguelensis (A), F. rhombica (A), S. gracilis (C), Thalassiosira antarctica (C) | 13H-7, 22 | 119.97 | A/G | Actinocyclus actinochilus (F), Chaetoceros spp. RS (A), F. curta (A), F. kerguelensis (C), F. obliquecostata (F). F. ritscheri (F), F. rhombica (A), F. sublinearis (F), Odontella spp. (X), Porosira glacialis (R), S. gracilis (F), Thalassiosira antarctica (C), T. lentiginosa (C), T. tumida (F) | ||
| 14H-4, 50 | 126.34 | A/M–G | E. antarctica resting (F), F. curta (C), F. kerguelensis (A), F. rhombica (A), S. gracilis (C), Thalassiosira antarctica (C), T. lentiginosa (F), T. oliverana (F), T. tumida (F) | 14H-4, 52 | 126.36 | A/G | C. criophilus (F), Corethron pennatum (A), F. kerguelensis (C), F. ritscheri (F), R. antennata var. semispina (C), Trichotoxon reinboldii (F) | Orange | |
| 15H-7, 67 | 138.65 | A/G | F. curta (C), F. kerguelensis (C), F. rhombica (C), F. vanhuerckii (F), R. antennata var. semispina (A), Thalassiosira antarctica (C) | 15H-7, 71 | 138.69 | A/G | Chaetoceros spp. RS (A), F. curta (C), F. kerguelensis (A), F. obliquecostata (C), F. ritscheri (C), F. rhombica (C), Thalassiosira antarctica (C), T. lentiginosa (C) | ||
| 16H-3, 59 | 144.19 | A/G | Chaetoceros spp. RS (A+), F. kerguelensis (C), P. glacialis (C), S. gracilis (F), Thalassiosira antarctica (C), T. lentiginosa (C) | 16H-3, 61 | 144.21 | A/G | Azpetia tabularis (R), Chaetoceros spp. RS (A), E. antarctica resting (F), F. curta (A), F. kerguelensis (C), F. obliquecostata (F), F. ritscheri (F), F. rhombica (F), F. sublinearis (F), Odontella spp. (X), P. glacialis (F), S. gracilis (F), Thalassiosira antarctica (C), T. lentiginosa (F) | ||
| 16H-6, 92 | 149.02 | A/G | Chaetoceros spp. RS (A+), E. antarctica resting (terminal and intercalary) (F), E. antarctica vegetative (F), F. curta (A), F. kerguelensis (C), F. rhombica (A), P. glacialis (C), S. gracilis(C), Thalassiosira antarctica (F), T. lentiginosa (C), Thalassiothrix antarctica (F) | 16H-6, 90 | 149.00 | A/M–G | Chaetoceros spp. RS (A), E. antarctica resting (F), F. curta (A), F. kerguelensis (C), F. obliquecostata (F), F. rhombica (C), F. sublinearis (F), F. vanhuerckii (R), P. glacialis (F), R. antennata var. semispina (C), R. simplex (F), S. gracilis (C), Thalassiosira antarctica (C), T. lentiginosa (F) | ||
| 17H-7, 62 | 152.22 | A/G | Chaetoceros spp. RS (A+), F. curta (A), F. kerguelensis (C), F. rhombica (A), F. ritscheri (F), P. glacialis (C), R. antennata var. semispina (F), S. gracilis (C), Thalassiosira antarctica (F), T. lentiginosa (C) | 17H-7, 64 | 152.24 | A/M | Chaetoceros spp. RS (A), E. antarctica resting (F), F. curta (A), F. kerguelensis (C), F. obliquecostata (C), F. rhombica (F), F. ritscheri (F), F. sublinearis (F), F. vanhuerckii (R), Odontella spp. (X), R. antennata var. semispina (F), S. gracilis (C), Thalassiosira antarctica (C), T. lentiginosa (F) | ||
| 18H-1, 111 | 160.71 | A/G | A. actinochilus (F), C. criophilus (F), Chaetoceros spp. RS (A+), C. pennatum (C), F. curta (C), F. kerguelensis (A), F. rhombica (C), F. sublinearis (F), F. vanhuerckii (R), R. antennata var. semispina (C), Thalassiosira antarctica (F), T. lentiginosa (F), Thalassiothrix antarctica(F) | 18H-1, 109 | 160.69 | A/M | Chaetocerosspp. RS (A), F. curta(A), F. kerguelensis (A), F. obliquecostata (C), F. rhombica (C), F. ritscheri (F), F. separanda (F), F. sublinearis (F), F. vanhuerckii (R), P. glacialis (F), S. gracilis (C), Thalassiosira antarctica (C), T. lentiginosa (C) | ||
| 19H-2, 80 | 171.39 | A/G | F. curta (F), F. kerguelensis (C), F. rhombica (F), T. lentiginosa (F), Thalassiothrix antarctica (A) | White | 19H-2, 80 | 171.39 | A/M–G | A. actinochilus (F), Chaetoceros spp. RS (A), Coscinodiscus occulus-iridis (F), F. curta (C), F. kerguelensis (C), F. rhombica (C), F. ritscheri (F), F. separanda (R), F. sublinearis (F), F. vanhuerckii (R), P. glacialis (C), S. gracilis (F), Stellarima microtrias (F), Thalassiosira antarctica (F), T. lentiginosa (F) | Olive |
Notes: Abundance: A+ = very abundant (≥100 specimens/field of view), A = abundant, C = common, F = few, R = rare, X = trace. Preservation: G = good, M = medium, P = poor. Bold depths = paired samples in which the light lamination is stratigraphically lower than the dark lamination. Green text = open-ocean affinity (Crosta et al., 2005), blue text = sea ice affinity (Armand et al., 2005), bold text = present at common or greater abundances.
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