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Fig. 8
Photomicrographs of diatoms from sediment and rock samples collected near the Boso
triple junction. Scale bars are 10 mm (scale A applies for micrographs 1-8 and scale B applies for
micrographs 9-25).
1
,
Denticulopsis hyalina
(Schrader) Simonsen (#148, R1-5, 11);
2
,
Denticulopsis lauta
(Bailey) Simonsen (#148, R1-5, 12);
3
,
Denticulopsis praedimorpha
var.
praedimorpha
Barron ex Akiba (#151, C-1);
4
,
Denticulopsis praedimorpha
var.
minor
Yanagisawa et Akiba (#148, R1-5, 12);
5
,
Neodenticula kamtschatica
(Zabelina) Akiba et
Yanagisawa (#148, R1-5, 2);
6
,
Neodenticula kamtschatica
(#148, R1-5, 12);
7
,
Neodenticulina
seminae
(Simonsen et Kanaya) Akiba et Yanagisawa (closed copula) (#148, R1-5, 2);
8
,
Neodenticula seminae
(#151, C-1);
9
,
Fragilariopsis doliolus
(Wallich) Medlin et Sims (#148,
R1-5, 11);
10
,
Alveus marinus
(Grunow) Kaczmarka et Fryxell (#148, R1-5, 2);
11
,
Nitzschia
reinholdii
Kanaya ex Barron et Baldauf (#151, C-1);
12
,
Cavitatus lanceolatus
Akiba et Hiramatsu
(#151, R-1);
13
,
Nitzschia sicula
(Castracane) Hustedt (#151, C-2);
14
,
Azpeitia neocrenulata
(Van Landingham) Fryxell et Watkins (#151, C-1);
15
,
Azpeita africana
(Janisch) Fryxell et
Watkins (#151, C-1);
16
,
Hemidiscus cuneiformis
Wallich (#150, C-1);
17
,
Azpeitia tabulais
(Grunow) Fryxell et Sims (#148, R1-5, 12);
18
,
Azpeita nodulifera
(Schmidt) Fryxell et Sims
(#150, C-1);
19
,
Actinoptychus senarius
(Ehrenberg) Ehrenberg (#150, C-1);
20
,
Cyclotella striata
(Kutzing) Grunow (#148, R1-5, 12);
21
,
Paralia sulcata
(Ehrenberg) Cleve (#151, R-1);
22
,
Trochosira spinosa
Kitton (#148, R1-5, 11);
23
,
Actinocyclus ingens
f
. nodus
(Baldauf) Whiting
et Schrader (#151, R-1);
24
,
Bacterosira fragilis
(Gran) Gran (#148, R1-5, 12);
25
,
Thalassiosira
antiqua
(Grunow) Cleve-Euler var. 1 (#148, R1-5, 11)
3.3
Summary of Age of Samples
Sample #151 R-1 was assigned to the
Denticulopsis lauta
Zone (NPD4A).
According to Watanabe and Takahashi (
1997, 2000
), this diatom zone corresponds
to the lower part of the Kinone Formation of the Miura Group on the Boso
Peninsula (Fig.
9
).
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