Table T3. Stratigraphic occurrence of diatom species, Site 1100.
Seismic Unit
Diatom Zone
Observer
Depth (mbsf)
Core, section, interval (cm)
Slide preparation
Abundance of diatom fragments Abundance of diatom frustules Preservation Planktonic diatoms: Actinocyclus karstenii Azpeitia tabularis Chaetoceros spp. (resting spores) Coscinodiscus oculus-Iridus Eucampia antarctica Fragilariopsis kerguelensis Paralia sulcata Rhizosolenia spp. Stellarim spp. Thalassiosira antarctica Thalassiosira lentiginosa Thalassiosira oestrupii Thalassiosira oliverana Thalassiosira striata Thalassiosira torokina Thalassiosira spp. Thalassiothrix antarctica Thalassionema and Thalassiothrix fragments Benthic diatoms: Cocconeis spp.
Total
diatoms counted
Remarks
S1 T. Ientignosa Zone

178-1100C-


























MI 4.00 1R-CC H2O2 R R P


2 1
3
+
2 1
1
1 1
+
+ 12
































178-1100D-


























DW 0.11 1R-CC Smear C R P




+ F















DW 14.68 2R-CC Smear F R P





1















MI 14.68 2R-CC H2O2 R R P

+

10 6
3 1 23 1 1 2 1
3 0.5


51.5
DW 24.58 3R-CC Smear F R P
+



R +




+
3






DW 33.94 4R-CC Smear F B P






















MI 33.94 4R-CC H2O2 R R P




2 ?+ 1 +

+
1
+

+
+ 4
Barren DW 44.68 5R-CC Smear R B P






















DW 54.63 6R-CC Smear B B -






















MI 54.63 6R-CC H2O2 B B -






















DW 62.76 7R-CC Smear B B -





















Mud on rock surface
MI 76.97 9R-CC Smear B B -






















MI 76.97 9R-CC H2O2 B B -






















MI 82.03 10R-CC Smear B B -





















Mud on rock surface
MI 82.03 10R-CC H2O2 B B -





















Mud on rock surface
MI 91.55 11R-CC Smear B B -






















MI 100.90 12R-1, 0-5 H2O2 + B -






















MI 101.44 12R-CC Smear B B -





















Mud on rock surface

Note: Smear slides and hydrogen peroxide-processed slides were used. Abundance: A = abundant, C = common, F = few, R = rare, + = present, B = barren. Preservation: G = good, M = moderate, P = poor.