Table 5. Stratigraphic distribution of radiolarians at Hole 1083A.
Age
Zone
Core, section,
interval
Depth (mbsf)
Abundance
Preservation
Amphirhopalum ypsilon
Cycladophora davisiana
Didymocyrtis tetrathalamus
Eucyrtidium calvertense
Eucyrtidium teuscheri
Eucyrtidium acuminatum
Lamprocyclas hannai
Lamprocyrtis nigriniae
Pterocanium praetextum eucolpum
Pterocanium trilobum
Spongurus pylomaticus
Theocorythium trachelium
Cycladophora cornutoides
Phormostichoartus corbula
Saturnalis circularis
Axoprunum angelinum
Lamprocyrtis neoheteroporos
Phormostichoartus fistula
Spongaster tetras tetras
Lamprocyrtis heteroporos
Didymocyrtis avita
Cycladophora pliocenica
Cycladophora sakaii


175-1083A-
Quaternary B. invaginata–C. tuberosa 1H-CC 1.74 A G P P P P + P P + + + P +










Quaternary B. invaginata–C. tuberosa 2H-CC 9.22 A G + P P P

P +
P
P P + +







Quaternary B. invaginata–C. tuberosa 3H-CC 20.94 A G
P P
P + P
+ P P + P






































Pleistocene A. angelinum–A. ypsilon 5H-CC 40.19
A G + P


P P + + P

P

P





Pleistocene A. angelinum–A. ypsilon 6H-CC 42.42 A G
P + P P + P P + + P + +
P P






Pleistocene A. angelinum–A. ypsilon 7H-CC 59.08 A G
P
P P
P


P +

+ P






Pleistocene A. angelinum–A. ypsilon 8H-CC 68.69 A G
P

+ P P
P P
P +
+ P






Pleistocene A. angelinum–A. ypsilon 9H-CC 77.84 A G + P
P

P P + P P P P + + P






Pleistocene A. angulare 10H-CC 87.60 A G + P
P P
P P



P P
P P





Pleistocene A. angulare 11H-CC 96.53 A G + P P P
+ P
P P
+
+
P
+ +



Pleistocene A. angulare 12H-CC 106.66 A G P P P P P + P

P

+ P + P

+ +


Pleistocene A. angulare 13H-CC 115.19 A G
P + P P P P

P

+
+ P +





Pleistocene A. angulare 14H-CC 124.54 A G + P
P + + P

P

+

P + +
+ P

Pleistocene A. angulare 15H-CC 134.79 A G + P P P P + P
P + +



P +

P


Pleistocene A. angulare 16H-CC 144.47 A G
P P P P + P
+ P P
+ + + P






Pleistocene A. angulare 17H-CC 154.12 C G P +
P P
P

P P
P

+ P

P


Pleistocene A. angulare 18H-CC 162.61 A G P P P P P + P
P P P
P P P P P P
+































Pliocene P. prismatium 19H-CC 173.22 A G P P

P
P

P +
P







P
Pliocene P. prismatium 20H-CC 182.72 A G
P + P P
P




P +
P
+




Pliocene P. prismatium 21H-CC 192.23 C G P
P + P P P

P +
P
+
+

P


Pliocene P. prismatium 22H-CC 201.45 A M
P

P + P

P +
P
P +


P

P

Notes: Occurrence is indicated by P = present and + = one specimen per slide. Abundance: A = abundant and C = common. Preservation: G = good and M = moderate. B. invaginata = Buccinosphaera invaginata; C. tuberosa = Collosphaera tuberosa; A. angelinum = Axoprunum angelinum; A. ypsilon = Amphirhopalum ypsilon; A. angulare = Anthocyrtidium angulare; P. prismatium = Pterocanium prismatium.