Microfossil Analysis and Paleoenvironmental Changes of Kazusa and Shimousa Groups from Cores in the Port of Tokyo, Central Japan
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1 No pp Microfossil Analysis and Paleoenvironmental Changes of Kazusa and Shimousa Groups from Cores in the Port of Tokyo, Central Japan Katsuhisa SEKIMOTO, Masanobu YOSHIKAWA, Kei ANMA, Keisuke SHIMIZU and Kunihiko ENDO Received October 31, 2008 Using the longer cores from the Port of Tokyo, biostratigraphy of the Kazusa Group and Shimousa Group were investigated. Mainly pollen and foraminiferal analyses from 400 meters long core, suggest environmental changes in the Tokyo Bay area probably during the last 1.3 to 1.4 Ma. Especially pollen assemblage shows important changing trends in the Kazusa Group, which is characterized by cold to cool elements and sometimes accompanying cool to warm elements. Foraminifer assemblages indicate also changing trend of colder and warmer phases. Such changing trends suggest the analysed horizons of the Kazusa Group may cover the upper Kiwada, Otadai, Umegase and Kokumoto formations in ascending order. On the other hand, the Shimousa Groups, composed of the Edogawa and Tokyo formations, are characterized by cool to warm elements. Keywords: microfossil, paleoenvironment, Kazusa Group, Tokyo Port, foraminifera, pollen Aoki: 1963, Oda, Kitazato, m200m 110m 1 400m200m 110m m 400m Geological Science Research: , Daitakubo, Minami-ku, Saitama City, Saitama Prefec., , Japan Ancient Forest Research: Nanokahara 293-6, Togattaonsen Zao-City, Katsuta Gun, Miyagi Prefec., , Japan Kawasaki Geological Engineering Co. Ltd.: , Mita, Minato-ku, Tokyo, , Japan Former Bureau of Port and Harbor, Tokyo Metropolitan Government: , Takashimadaira, Itabashi-ku, Tokyo, , Japan Department of Geosystem Sciences, College of Humanities and Sciences, Nihon University: , Sakurajosui, Setagaya-ku, Tokyo, , Japan
2 AU m110m 2 2AU2-1 CN13bOkada & Bukry(1980)Matsuoka and Okada(1989)
3 m 50m 20 30m 400m100m 50m m AP-91.2m 400m B/M Okada & Bukry1980 CN13b 360m Large Gephyrocapsa Ma340m Helicosphaera sellii1.2ma 97m AP-91.2m CN13b a, b Helicosphaera inversa 0.51Ma5Reticulofenestra asanoi 0.85Ma U4 6Gephyrocapsa parallela 0.95Ma 7Reticulofenestra asanoi1.16ma O23 8Large Gephyrocapsa 1.21Ma 9 Helicosphaera sellii1.27ma Kd8 Kd16 10Large Gephyrocapsa 1.45Ma Kd19 11Gephyrocapsa oceanica1.65ma Kd25 12Gephyrocapsa caribbeanica 1.73Ma Kd38 ( ) BG 20 40m AU g 10g 10 KOH HF KOH 2 AU C 40g C
4 C 40g a. PiceaTaxodiaceae Picea Taxodiaceae AB 2 Picea A 100m 4-6m Picea koribai, Picea A Picea 115m 115m 5m Picea A 115m Picea A 100m Picea B Taxodiaceae 28m Taxodiaceae A Taxodiaceae B Metasequoia Taxodiaceae Ueno, m Metasequoia Taxodiaceae B Metasequoia CryptomeriaMetasequoiaShoma 1985 b. 3 AU Sphagnum AU2-1 AU1-5AU2-2AA10-11 AA10-12 AU2-1 Kp-Kp- AU m Sp-Np- 15 Kp Sp Np Kp- AU mTsuga cf. Metasequoia Taxodiaceae I a Id 4 Kp-Ia AU mTsugaPicea B Pinus Cryptomeria cf. Metasequoia Kp-Ib AU m 1 cf. Metasequoia Taxodiaceae Picea BPinus Quercus Lepidobalanus Larix-Pseudotsuga PinaceaeCathaya type Kp-Ic AU mTaxodiaceae Picea B Picea QuercusLepidobalanus PinusPinaceae Cathaya typecf. MetasequoiaKp
5 3AU2-1 IdAU mTsuga Picea BQuercus LepidobalanusCryptomeria Sciadopitys, Pinaceae Cathaya type cf. Metasequoia Kp- AU mQuercus Lepidobalanus Pinus Haploxylon Tsuga cf. Metasequoia Pinaceae Cathaya type Kp- AU mTsuga Quercus LepidobalanusCryptomeria Taxodiaceae A Kp- AU mPinus HaploxylonBetula, Quercus Lepidobalanus Quercus Cyclobalanopsis Kp- AU mTsugaPicea Pinus AU2-1 Picea B Picea A Sp- AU mFagus 19PinusHaploxylon Ulmus-Zelkova Fagus S p-au mTsuga 60Picea BPinus Haploxylon Sp- AU m Cryptomeria Picea B Sp- AU mHemiptela Quercus LepidobalanusTsuga, Cryptomeria Juglans Lagerstroemia Sapium Sp- AU mCryptomeria 61Cryptomeria Picea B Taxaceae-Cupressaceae-Cephalotaxaceae Sp- AU2-2 Sp- AA10-11 Sp- AA10-11 AU2-1 Sp- AU mPicea B PinusTsuga Pinus Diploxylon Sp- AA m
6 Picea BTsuga, PinusHaploxylon Fagus Quercus Lepidobalanus Sp- AA mPicea B Tsuga Cryptomeria Larix-Pseudotsuga Alnus Salix 2 400m AU m AU2-1 AU1-5AU2-2AA10-11 AA10-12 AU2-1 AU AU2-1 KF-1 5 SF-1 4 AU m 90.9m AU2-1 KF-1 4 KF-5 4AU
7 AU2-1 SF-1 3 KF-1 4 SF-1 SF-3 KF-1 AU2-1AP m AU2-1 Bulimina striata Bulimina aculeata zone Globocassidulina depressa, Bulimina marginata Pseudononion japonicum, Gaudryina cf. arenaria, Nonionellina labradorica, Stilostomella hayasakai, Stilostomella ketienziensis KF-1 Pseudononion japonicum Elphidium spp. KF-2 AU2-1AP m AU2-1 Uvigerina akitaensis Uvigerina cf. excellens, Uvigerina nitidula Uvigerina Uvigerina KF-1 Gaudryina cf. arenaria, Pseudononion japonicum KF-3 AU2-1AP m KF-1 Bulimina striata, Bulimina aculeata KF-1 Ammonia ketienziensisbolivinita quadrilatera, Cassidulina carinata, Globocassidulina depressacibicides aknerianus Stilostomella hayasakai, Stilostomella ketienziensis KF-4 AU2-1AP mBulimina aculeata Cassidulina carinata Bulimina aculeata KF-3 Ammonia ketienziensis, Bolivinita quadrilatera, Amphicoryna sagamiensis, Bulimina aculeata, Globocassidulina subglobosa, Nonionellina rabradoricaau m 4 SF-1 AU2-1AP m Buccella inusitata, Elphidium advenum, Elphidium clavatum Amphycorina sagamiensis Ammonia ketienziensis IV SF-3 AU2-1AP m SF-1 Ammonia japonica, Elphidium clavatum, Elphidium kusiroense, Nonionella stella Ammonia japonica Nonionella stella, Elphidium kusiroense SF-1 Elphidium reticulosumbuccella frigidanonionellina scapha SF-2 AU Kp- Tsuga, PiceaMetasequoia Cryptomeria Kp-Ia Ic Kp- Kp- Kp- Quercus Lepidobalanus Fagus Quercus CyclobalanopsisKp- Kp- Tsuga Picea Kp- Tsuga Abies, Pinus HaploxylonPicea Selaginella selaginoides Tsuga Pinus HaploxylonTsuga 1979 Tsuga Metasequoia 1994Kp-Ic Picea
8 Taxodiaceae Tsuga Sp- Fagus Sp-TsugaPinus Haploxylon Sp- Picea Sp- FagusQuercus Lepidobalanus Sp- Cryptomeria Picea Sp- Picea Larix-Pseudotsuga Sp- Hemiptela Lagerstroemia Sapium Sp- Cryptomeria Picea 2 KF-1 4 SF-1 3 KF-1 4SF-1 3 SF-2 KF KF-4 Cassidulina carinata SF-1 Buccella inusitata, Elphidium advenum, Elphidium clavatum SF-3 SF Metasequoia Cryptomeria 1969 cf. Metasequoia Taxodiaceae Tsuga Pinus, Picea Cryptomeria Kp-Ia Ib U6 Kp-Ic Taxodiaceae Sp- HemiptelaUlmus-Zelkova Lagerstroemia Sapium 1980 Sp- Sp- Picea Sp- Cryptomeria Picea 6 Klp-2 2 AU2-1 KF-2 Uvigerlna akitaensis U6 Aoki lshiwada Uvigerina akitaensis zonematoba1967 km AU2-1 KF-2 Uvigerina akitaensis zone KF-1 U6 KF-3 Bulimina aculeata Bulimina striata KF-2 KF-4 Cassidulina carinata zone SF-13 SF-3 TL AU2-1 AP-21m 16 2 Klp-7 SF
9 7 Kp- Tsuga, Picea Metasequoia Cryptomeria Kp-Ia Ic Kp- Kp- Kp- Quercus Lepidobalanus Fagus Quercus CyclobalanopsisKp-Kp- Tsuga Picea Kp- Abies, Pinus HaploxylonPicea Selaginella selaginoides Sp-Fagus Sp- Tsuga Sp- Picea Sp-FagusQuercus Lepidobalanus Sp- Cryptomeria Picea Sp- Picea Larix-Pseudotsuga Sp-Hemiptela Lagerstroemia Sapium Sp- Cryptomeria Picea AU2-1 KF-2 Uvigerlna akitaensis Uvigerina akitaensis zone Matoba1967 km Uvigerina akitaensis zone KF-1 U6 KF-3 Bulimina aculeata Bulimina striata KF-2 KF-4 Cassidulina carinata zone SF-13 SF-3 TL Klp-7 SF-1 400m 1991 GS-ED-1 400m 200m 110m 400m 9 Helicosphaera sellii Kd8 Kd16-200m U
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