Table T8.
Definition of calcareous nannofossil zonation scheme of Martini (1971) and Bukry
(1973b, 1975) and Okada and Bukry (1980).
Calcareous
nannofossil zone definition
Calcareous
nannofossil zone
Martini
(1971)Bukry
(1973b, 1975);
Okada and Bukry(1980)
FO Emiliania
huxleyi to Recent
NN21
CN15
LO Pseudoemiliania
lacunosa to FO Emiliania huxleyi
NN20
CN14b
FO Gephyrocapsa
oceanica to FO Gephyrocapsa caribbeanica
CN13b
LO Discoaster
brouwerii to FO G. caribbeanica
CN13a
LO Discoaster
brouwerii to LO P. lacunosa
NN19
LO Discoaster
pentaradiatus to LO D. brouwerii
NN18
CN12d
LO Discoaster
surculus to LO D. pentaradiatus
NN17
CN12c
LO Discoaster
tamalis to LO D. surculus
CN12b
LO Reticulofenestra
pseudoumbilica to LO D. tamalis
CN12a
LO Reticulofenestra
pseudoumbilica to LO D. surculus
NN16
FO Discoaster
asymmetricus acme to LO R. pseudoumbilica
NN15
CN11b
FO Discoaster
asymmetricus to LO A. tricorniculatus/Amaurolith extinction
NN14
LO Amaurolithus
primus to FO D. asymmetricus acme
CN11a
FO Ceratolithus
rugosus to FO D. asymmetricus
NN13
FO C. rugosus
to LO A. primus
CN10c
LO Triquetrorhabdus
rugosus or FO C. acutus to FO C. rugosus or LO C.
acutus
CN10b
LO Discoaster
quinqueramus to LO T rugosus or FO C. acutus
CN10a
LO Discoaster
quinqueramus to FO C. rugosus and/or LO C. acutus
NN12
FO to LO of Discoaster
quinqueramus
NN11
FO D. berggrenii
and/or FO of D. surculus to LO D. quinqueramus
CN9
LO Discoaster
hamatus to FO D quinqueramus
NN10
FO D berggrenii
to FO D. surculus
CN8
FO Discoaster
neorectus to FO D. berggrenii
CN8b
LO D. hamatus
to FO D. neorectus
CN8a
FO to LO D. hamatus
NN9
CN7a+b
FO Catinaster
coalitus to FO D. hamatus
NN8
CN6
FO Discoaster
kugleri or C. floridanus to FO C. coalitus
NN7
CN5b
LO Sphenolithus
heteromorphus to FO D. kugleri or LO C. floridanus
NN6
CN5a
FO Helicosphaera
ampliaperta to LO S. heteromorphus
NN5
CN4
LO Sphenolithus
belemnos to LO H. ampliaperta
NN4
CN3
Note: FO = first occurrence; LO = last occurrence.