Fossils
Online ISSN : 2424-2632
Print ISSN : 0022-9202
ISSN-L : 0022-9202
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Volume 87
Displaying 1-35 of 35 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    2010 Volume 87 Pages Cover1-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_Cover1
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages App1-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_App1
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages App2-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_App2
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages App3-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_App3
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  • Microfocus X-ray CT method for the reconstruction of fossil internal structure : A case of spiriferid brachidium
    Yuta Shiino, Osamu Kuwazuru, Nobuhiro Yoshikawa
    Article type: Article
    2010 Volume 87 Pages 1-2
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_1
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  • [title in Japanese]
    Article type: Index
    2010 Volume 87 Pages Toc1-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_Toc1
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages App4-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_App4
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  • Reconstruction of ancient cold-seep activities based on biomarkers : A case study of Lower Pleistocene Ofuna and Koshiba Formation, central Japan
    Misato Tsuboi, Eiko Nakamura, Ryuichi Majima, Hiroshi Kitazato, Hisami ...
    Article type: Article
    2010 Volume 87 Pages 5-21
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_5
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    We analyzed lipid biomarkers related to AOM (anaerobic oxidation of methane) that happened in the early Pleistocene (1.7-1.4Ma) cold-seep site, northern part of Miura Peninsula, Pacific side of central Japan. Nineteen samples are obtained from a bedding-normal, 107m-long core consisting of the Koshiba (sandy mudstone and muddy sandstone, above 23m in core depth) and the Ofuna (mudstone, below 23m) Formations. In this core, both the chemoautotrophic bivalves (Lucinoma, Conchocele, Archarax) and ^<13>C-depleted authigenic carbonates (aragonite, MG-calcite, dolomite) occur abundantly. Four important results of this study are summarized as follows. 1) Both archaeal and sulfate reducing bacterial (SRB) biomarkers are recovered in all samples and their ether linkages are well preserved even in 1.7-1.4Ma sediments. 2) High activities of AOM are inferred in 7.1-7.6m and 14.6m in core depths where both archaeal and SRB-biomarkers are distinctly concentrated and greatly depleted in ^<13>C (δ^<13>C less than-100‰ vs. PDB). Those activities happened probably when marine bottoms were in 6.5-7m and 13-13.5m, respectively, where chemoautotrophic bivalves occur abundantly. 3) Two samples obtained from the same horizon 14.6m show an apparent difference in biomarker compositions. This difference may be attributed to a different micro habitats for microbes. 4) The occurrences of biomarkers derived from planktonic archaea are inferred from their δ^<13>C values and relative abundance of 4 kinds of biphytanes. Planktonic archaeal biomarkers are probably recovered from all samples and their concentration rates may be useful as an index of sedimentation rate.
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  • A Balaenopterid skull (Order Cetacea) from the Early Pleistocene of Kuromatsunai, Hokkaido, Japan
    Hitoshi Furusawa, Hikaru Yokoyama, Masaichi Kimura
    Article type: Article
    2010 Volume 87 Pages 23-27
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_23
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    A partial mysticete skull (Order Cetacea) was discovered in the early Pleistocene (1.2-1.0Ma) Setana Formation at Kuromatsunai, Hokkaido, Japan. We have identified it as a member of the family Balaenopteridae gen. et sp. indet. based on features of the occipital region. The breadth of the occipital is within the adult range of the recent species Balaenoptera brydei, B. borealis, and B. physalus or B. musculus. This fossil indicates that very large species of the family Balaenopteridae had evolved and radiated before the early Pleistocene.
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  • Report of Middle Permian fusulinids from Kosado Hill, Sado Island, Japan
    Masahiro Ichida, Hisashi Suzuki, Masaharu Kondo, Yasuo Nogami
    Article type: Article
    2010 Volume 87 Pages 29-34
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_29
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    A good-preserved fusulinid fauna is reported for the first time from Kosado Hill, Sado Island in central Japan. The fusulinids were found in erratic conglomeratic limestone blocks that are left alone along the forestry road. The fusulinid fauna is characterised by abundant occurrence of the genus Lepidolina including Lepidolina kumaensis, L. gigantea and L. multiseptata. The species of the genera Chusenella, Kahlerina, Pseudokahlerina, Reichelina, Rauserella and Nankinella have also been found in the fauna. The fusulinid fauna of Kosado Hill can be correlated to that of the Kuma Formation of central Kyushu, indicating Midian of the Middle Permian. The present limestone is identical in age with radiolaria-bearing black mudstone cropping out at southeast of the fusulinid locality. Based on the fusulinid faunal composition, the present limestone should be geotectonically ascribed to the Maizuru and/or Kurosegawa Terranes of Southwest Japan. The radiolaian fauna of Kosado Hill, however, shows similaritiy to that of the Ultra-Tanba and/or Kurosegawa Terranes. In terms of both fusulinid and radiolarian faunal characteristics, it is concluded that the Permian strata of Kosado Hill can be correlated to those of a series of Palaeozoic terranes such as the Maizuru, Ultra-Tanba and Kurosegawa Terranes.
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  • Seasonal variation in living planktic foraminiferal assemblage in the northeastern part of the East China Sea
    Makoto Yamasaki, Takayuki Murakami, Masaya Tsuchihashi, Motoyoshi Oda
    Article type: Article
    2010 Volume 87 Pages 35-46
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_35
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    Seasonal variation in standing stock and assemblage of living planktic foraminifera were investigated using plankton-net samples from the northeastern part of the East China Sea (ECS), in 1995 and 1998-1999. As a result, a distinctive alternation of major species among seasons was confirmed. Whereas the summer assemblage was apparently characterized by dominance of Globigerinoides sacculifer and Globigerinoides ruber, those 3 species like Globigerinita glutinata, Globigerina bulloides and Pulleniatina obliquiloculata were abundant in winter. Neogloboquadrina dutertrei and Globigerinella aequilateralis were observed in all samples. Globorotalia inflata was found to dwell shallower in winter, by contrast deeper than 100m in summer in ECS, clearly suggesting its ecology to change the favorable depth in their life cycle. Because vertical distribution of the standing stock of planktic foraminifera and chlorophyll-a concentration during the examined interval was well correlated, one of the principle factors to control absolute abundance of planktic foraminifera is inferred to be food conditions. Further, it is suggested that the potential impact of a flood of the ChangJiang River in summer, 1999 on the hydrographic environment in ECS was rather an eutrophication at the sea surface caused by the river discharge, than an influx of low salinity waters, bringing an increase of standing stock of shells together with no drastic change in assemblage.
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  • Age model of core sediments taken by D/V CHIKYU during the shakedown cruises off Shimokita Peninsula
    Hanako Domitsu, Hiroshi Nishi, Junichi Uchida, Motoyoshi Oda, Kaoru Og ...
    Article type: Article
    2010 Volume 87 Pages 47-64
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_47
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    Three continuous cores of 47m, 71m and 365m in thickness were recovered from the subseafloor at about 1200m water depth at Holes C9001A, C9002A/B and C9001C/D during D/V CHIKYU shakedown cruises of CK05-04 Leg 2 (16 November-14 December 2005) and CK06-06 (6 August-29 October 2007). The core sediments are composed mainly of diatomaceous silty clay, and are divided into four lithologic units from Units A to D at Hole C9001C. The Unit A is characterized by common intercalations of tephra/sand and higher magnetic susceptibility (MS), while the Unit B is rare in tephra/sand intercalations with lower MS. The Unit C is composed of unconsolidated sands, and the Unit D is similar in lithology with the Unit A. The integrated stratigraphy of micropaleontology, tephrochronology and magnetostratigraphy suggest that the bottom age of Hole C9001C core is correlated with the base of the Brunhes Chron (Chron C1n) that is assigned to about 780ka (Middle Pleistocene). The geological age of Hole C9001D ranges from 1.05 to 1.65Ma (Early Pleistocene). The oxygen isotope stages from Marine Isotope Stage (MIS) 1 to MIS 18 are recognized in Hole C9001C based on the correlation with a standard isotope curve, and these data accord well with the results of biostratigraphy and magnetostratigraphy. The Unit A ranges from MIS 1 to MIS 8 (about 300ka), and Unit B spans from MIS 9 to MIS 16 (300ka-640ka). The Units C and D are assigned to MIS 17 and MIS 18, respectively. Hole C9001C core has a continuous sequence without hiatus although a disturbance layer occurs around 150mbsf. Thus, the Shimokita cores have a strong potential to improve biochronology and revise geological time scales for the past 800kyr in the Northwest Pacific region.
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  • Paleoceanographic history of offshore Shimokita Peninsula for the past 800,000 years based on primary analyses on cores recovered by D/V CHIKYU during the shakedown cruises
    Kan Aoike, Hiroshi Nishi, Tatsuhiko Sakamato, Koichi Iijima, Masashi T ...
    Article type: Article
    2010 Volume 87 Pages 65-81
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_65
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    D/V CHIKYU shakedown cruises of CK05-04 Leg 2 (16 Nov.-14 Dec. 2005) and CK06-06 (6 Aug.-29 Oct. 2007) were carried out off Shimokita Peninsula of the Northeast Japan. During these two cruises, three continuous cores of 47m, 71m and 365m long were recovered from the seafloor of about 1200m water depth at Holes C9001A, C9002A/B and C9001C, respectively. Cuttings samples were collected from Hole C9001D from 522 to 647mbsf in penetration depth using riser drilling. The onboard laboratory systems integration test including primary processing and measurements of the recovered cores were performed for laboratory performance evaluation and laboratory staff training. Two coring sites (C9001 and C9002) are located in Hidaka Trough that is a forearc basin under tectonic effects of both subduction and arc-arc collision. Cored sediments at four holes (C9001A, C9002A/B, C9001C) are mainly composed of diatomaceous silty clay, and divided into four lithologic units based on the lithology at Hole C9001C. Unit A is characterized by common intercalations of tephra/sand, while Unit B is rarely found in tephra/sand intercalations. Unit C is composed of a unconsolidated sands, and the Unit D is similar to the Unit A that is common intercalations of tephra/sand layers. The integrated stratigraphy based on micropaleontology, tephrochronology and magnetostratigraphy suggests that a bottom age of Hole C9001C at 365mbsf is assigned to about 780ka, and the geological age of Hole C9001D ranges from 1.05 to 1.65Ma. The sedimentation rate is high and nearly constant of 62cm/kyr at Hole C9001C and is low of about 17cm/kyr at Hole C9001D. The core of Hole C9001C has a continuous sequence without hiatus although the disturbance interval is recognized around 130mbsf. Based on the age model, the volcanic activity around the Northwest Pacific is thought to decrease during approximately 250-640ka of Unit B of C9001C using magnetic susceptibility data and the stratigraphy of tuff layers. The physical measurements of various methods revealed that two different lithology of Clays A and B are recognized in the sediments. The Clay A contains abundant diatoms during high productivity period, while Clay B is affected by inflow of high terrigenous clastics or low diatom productivity. These clays suggest a cyclic sedimentation controlled by the Milankovitch cycles.
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  • Myology of crocodiles II : Pectoral girdle and forelimb
    Daisuke Suzuki, Shoji Hayashi
    Article type: Article
    2010 Volume 87 Pages 83-102
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_83
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  • Obituary: Dr. Koichiro Ichikawa
    Akira Yao
    Article type: Article
    2010 Volume 87 Pages 103-104
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_103
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    2010 Volume 87 Pages 105-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_105_1
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    2010 Volume 87 Pages 105-106
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_105_2
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    2010 Volume 87 Pages 106-107
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_106
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    Article type: Article
    2010 Volume 87 Pages 107-109
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_107
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    2010 Volume 87 Pages 109-110
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_109
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages 111-114
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_111
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages 114-115
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_114
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages 116-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_116
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages 117-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_117
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages 118-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_118_1
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages 118-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_118_2
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages 118-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_118_3
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages 119-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_119
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages App5-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_App5
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages App6-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_App6
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages App7-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_App7
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages App8-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_App8
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  • [title in Japanese]
    Article type: Appendix
    2010 Volume 87 Pages App9-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_App9
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  • [title in Japanese]
    Article type: Cover
    2010 Volume 87 Pages Cover2-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_Cover2
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  • [title in Japanese]
    Article type: Cover
    2010 Volume 87 Pages Cover3-
    Published: March 31, 2010
    Released on J-STAGE: October 03, 2017
    DOIhttps://doi.org/10.14825/kaseki.87.0_Cover3
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