化石

表紙

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2008 年 84 巻 p. Cover1-
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_Cover1

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日本古生物学会「化石」編集委員会(2008-2009年度)等

原稿種別: 付録等
2008 年 84 巻 p. App1-
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_App1

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表紙および裏表紙説明

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2008 年 84 巻 p. App2-
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_App2

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モンゴル国南部Tugrikin-Shirehに分布する上部白亜系ジャドフタ層の生痕化石とその産状

実吉玄貴, 渡部真人

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2008 年 84 巻 p. 1-2
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_1

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目次

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2008 年 84 巻 p. 3-
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_3

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「化石」投稿規定

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2008 年 84 巻 p. 4-
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_4

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カンブリア紀最前期胚化石の化石化過程と古海洋的背景

國光陽子, 狩野彰宏, 安井金也, 舒徳干, 韓健, 華洪

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2008 年 84 巻 p. 5-17
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_5

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Paleontological, petrological and geochemical studies from the Kuanchuanpu Formation in southern Shaanxi Province, strata known for the earliest Cambrian animal embryos, revealed the paleoceanographic settings and processes permineraling an exceptionally rich fauna. Lack of highenergy sedimentary structures and presence of fossilized photosynthetic microbes indicated that a calm and shallow depositional environment was developed on the northern marginal Yangtze platform. The upward-decreasing trend of reductive elements (Mn and Fe) in carbonate fraction indicated a gradual transition to oxic conditions, which allowed animals to inhabit during the deposition of the upper Kuanchuanpu Formation. The animal embryos and small shelly fossils were permineralized by apatite due to intensified upwelling that rose the concentration of phosphates in the bottom water. The intensified upwelling was probably responsible for the upward-decreasing trend of the carbonate δ^<13>C values. The permineralization selectively proceeded in the organic lipid membranes that were resistant against decomposition. The lowered pH, locally developed by bacterial activities inside the embryos was another potential factor for the precipitation of apatite.

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熊本県天草下島の西部に露出する上部白亜系姫浦層群の地質

山口弘幸, 小松俊文, 佐藤道孝, 長谷川四郎, 西弘嗣

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2008 年 84 巻 p. 18-36
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_18

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The Upper Cretaceous Himenoura Group is composed of non-marine to marine fossiliferous clastic deposits, and is widely exposed on Shimojima, Amakusa Islands, western Kyushu, Japan. The Himenoura Group in this area is divided into the Hamasato, Yokohama, Ikusagaura, and Sakitsu Formations in ascending order. These formations are newly defined on the basis of the present study, and the Ikusagaura Formation is subdivided into the Kurosezaki Sandstone and Mudstone, Kotakahama Conglomerate and Sandstone, and Shimo Sandstone and Mudstone Members. The Hamasato and Yokohama Formations consist mainly of mudstone, sandstone, and gravelly sandstone containing abundant shallow marine and brackish-water molluscan fossils. The Ikusagaura and Sakitsu Formations are composed of alternating beds of sandstone and mudstone, thick sandstone, and conglomerate. The Ikusagaura Formation yields abundant brackish-water bivalves. The Sakitsu Formation is dominated by coarse sediment, and rarely contains marine bivalves. The Himenoura Group yielded over 26 bivalve species belonging to 21 genera. The brackish-water bivalves are characterized by Crassostrea, Corbula, Mesochione, and Leptosolen, and the shallow marine bivalves consist of well-preserved Glycymeris, Loxo, Apiotrigonia, Inoceramus, and Sphenoceramus. The geological age of the group is determined from age-diagnostic inoceramid species. The Hamasato Formation contains Sphenoceramus orientalis (Sokolow) and S. nagaoi (Matsumoto and Ueda), indicating lower Campanian depostion, while S. schmidti (Michael) and S. sachalinensis (Sokolow) are found together in the upper parts of the Yokohama Formation, indicating middle Campanian deposition. The Ikusagaura Formation yields the brackish-water bivalve Mesochione trigonalis, corresponding to the middle to upper Campanian (-Maastrichtian?).

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茨城県大子地域における中新世植物化石群

永戸秀雄

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2008 年 84 巻 p. 37-46
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_37

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Plant-bearing terrestrial to shallow marine strata of Early to earliest Middle Miocene age are described from the Daigo area of Ibaraki Prefecture. They are divided into the Kitatake Formation (lower), which includes the Osawaguchi Tuff Member in its uppermost part, and the Asakawa Formation. A total of 54 species, in 26 families and 45 genera, are recognized from the two formations. They are composed mainly of deciduous dicots, associated with evergreen dicots, conifers, and herbaceous plants. Based on the floral composition and on components of evergreen and warm deciduous dicot elements, the plant assemblages are subdivided into three floras, which occur in the Kitatake Formation and the lower and upper parts of the Asakawa Formation, respectively. These three floras indicate upward warming from a warm-temperate climate to a warm-temperate to subtropical one, judged from the composition of evergreen and warm deciduous elements, and the percent of entire-margined dicot species. In addition to the floral characteristics, evidence from marine mollusks in the upper part of the Asakawa Formation and from radiometric ages indicate that these three floras represent floral and paleoclimatic changes during approximately 18 to 16Ma, within the Daijima-type floras.

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高知県四万十市の上部白亜系佐田石灰岩の岩相と化石群集

延原尊美, 恩田大学, 菊池直樹, 近藤康生, 松原啓, 天野和孝, ジェンキンズロバート, 疋田吉識, 間嶋隆一

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2008 年 84 巻 p. 47-60
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_47

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The Sada Limestone in the Upper Cretaceous Nakamura Formation, Shimanto Belt, Shikoku, Japan is known to yield abundant "Thyasira" and "Serpula" fossils. However, the whole assemblage has never been studied to an appropriate depth. We present a preliminary report on the mode of occurrence, lithology, and faunal composition of the Sada Limestone followed by discussion on its origin. The limestone crops out at more than 10 localities in an elliptical area (250m in NE-SW, 400m in NW-SE direction) surrounded by Upper Cretaceous siltstone. The boundary between the limestone and the siltstone is gradational, which suggests that the limestone was autochthonous. The Sada Limestone consists of three lithofacies: 1) banded limestone (detrital micrite with parallel calcite-sheets, showing inverted stromatactoid structure); 2) "Thyasira"-"Serpula" limestone (detrital micrite containing abundant autochthonous "Thyasira" and "Serpula"); and 3) sparsely-fossiliferous massive limestone, composed mainly of recrystallized sparite. The three lithofacies alternate with each other with intervals of several meters. The "Thyasira"-"Serpula" assemblage is associated with other chemosynthetic bivalves, such as Myrtea? sp. and Solemya sp. "Thyasira" shells are large (8cm of maximum shell length) and conjoined. The shells are densely packed in the limestone, whereas in the surrounding siltstone molluscan fosssils are rare. The taxonomic composition, mode of occurrence, and lithological characteristics such as inverted stromatactoid structure suggest that the Sada Limestone is seep-related and the fauna represents a chemosynthetic ecosystem similar to many other thyasirid-rich carbonates worldwide. However, to verify the hypothesis requires further biogeochemical approaches such as stable isotope and biomarker analyses.

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宮崎平野北部の鮮新統宮崎層群の地質と貝形虫化石群集

岩谷北斗, 入月俊明

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2008 年 84 巻 p. 61-73
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_61

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A total of 103 ostracode taxa were obtained from the upper Pliocene Sadowara and Takanabe Formations, Miyazaki Group, in the northern part of the Miyazaki Plain, Southwest Japan. Many of them live in sublittoral areas under the influence of the Kuroshio warm current. They have been also reported from upper Pliocene to lower Pleistocene deposits yielding the Kakegawa molluscan fauna. Three biofacies (U, M and L) were discriminated on the basis mainly of Q-mode cluster analysis. Biofacies U is dominated by Neonesidea spp., Loxoconcha ikeyai and Schizocythere kishinouyei, which live in sandy bottoms in upper to middle sublittoral zone. Biofacies M is characterized by Loxoconcha tamakazura, Loxoconcha tarda, Pontocythere cf. subjaponica and Cytheropteron uchioi which live in middle to lower sublittoral zone. Biofacies L contains such mud dwellers in lower sublittoral zone as Acanthocythereis munechikai, Bradleya albatrossia, Hirsutocythere? hanaii and Krithe spp. Spatio-temporal distribution of the ostracode biofacies and sedimentary facies show that 1) the sedimentary basin was deeper southward; 2) shallowing of the sea occurred during the deposition of the Sadowara Formation to the upper part of the Takanabe Formation; and 3) a rapid transgression occurred during the deposition of the uppermost part of the Takanabe Formation.

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北海道,忠類産ナウマンゾウの再検討

高橋啓一, 北川博道, 添田雄二, 小田寛貴

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2008 年 84 巻 p. 74-80
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_74

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The Churui specimen was found in 1969 and 1970 from Bansei, Churui, Makubetus-cho, Nakagawa-gun, Hokkaido, and is one of the most important whole skeletons of Palaeoloxodon naumanni. Herein, we reexamine the molar number and specific identification of this specimen. As a result of our observations, four molars that were previously identified as second molars of one individual are re-identified as third molars of one individual. These molars correspond to the group 25-27 of Laws (1966), and are therefore assumed to represent an age of about 50 years. Observations of the epiphyseal fusion of the postcranial bones in the Churui specimen support the result that the animal used its third molars. A molar that was previously identified as a third molar from the same individual as the four "second molars" of P. naummmni, is re-identified as a second or third molar of the woolly mammoth Mammuthus primigenius, as determined by morphological characters. It gave a radiocarbon date of 42,850+510BP. Woolly mammoths inhabited Hokkaido from 45ka to 16ka, while the horizon of P. naumanni from Churui is estimated to be 120ka. This suggests that the molar of the woolly mammoth fell from the upper part of the cliff at the excavation site of the Churui specimen, instead of being recovered from the excavation plane.

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岩手県陸中海岸に分布する下部白亜系宮古層群より穿孔性二枚貝化石の発見

猪瀬弘瑛

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2008 年 84 巻 p. 81-85
発行日: 2008/10/01
公開日: 2017/10/03

DOIhttps://doi.org/10.14825/kaseki.84.0_81

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The Lower Cretaceous Miyako Group is distributed along the Pacific coast of Iwate Prefecture, Northeast Japan. This Group is very famous for its abundant occurrence of well-preserved marine invertebrate fossils of various taxa. Lithophaga (Myapalmula) sp. (Mytilidae: Bivalvia) was discovered in a skeleton of hexacoral fossil contained in conglomerate of the Tanohata Formation of this group. L. (M.) sp. belongs to 'lithophagiform' which is functional Glade of boring mytilids. The occurrence of L. (M.) sp. indicates that subgenus of Myapalmula appeared from the Early Cretaceous onwards. It is inferred that L. (M.) sp. was dead coral borer. The occurrence of L. (M.) sp. supports warm sea during sedimentation of this Group.

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軟体動物の解剖 : コウイカ・サザエ・ホタテガイ

佐々木猛智

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2008 年 84 巻 p. 86-95
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_86

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ワニの筋学 : -古脊椎動物学者に必要な解剖- I.上顎,下顎

鈴木大輔, 林昭次

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2008 年 84 巻 p. 96-108
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_96

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名誉会員菅野三郎先生を悼む

天野和孝

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2008 年 84 巻 p. 109-110
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_109

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図説地球の歴史, 小泉格著, 朝倉書店, 2008年6月20日発行, 143pp., ISBN978-4-254-16051-2, 3400円(税別)

西弘嗣

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2008 年 84 巻 p. 111-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_111_1

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「第7回国際頭足類シンポジウム(札幌)」参加報告(学術集会参加報告)

御前明洋, 藤川将之, 辻野泰之, 西村智弘

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2008 年 84 巻 p. 111-113
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_111_2

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学会記事

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2008 年 84 巻 p. 114-116
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_114

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各賞贈呈文および受賞ポスター

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2008 年 84 巻 p. 116-120
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_116

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醵金者御芳名

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2008 年 84 巻 p. 120-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_120_1

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編集委員会より

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2008 年 84 巻 p. 120-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_120_2

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重要なお知らせ

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2008 年 84 巻 p. 121-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_121_1

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別刷についてのお知らせと料金計算について

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2008 年 84 巻 p. 121-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_121_2

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複写される方へ

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2008 年 84 巻 p. 121-
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DOIhttps://doi.org/10.14825/kaseki.84.0_121_3

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Notice about photocopying

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2008 年 84 巻 p. 121-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_121_4

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Paleontological Research電子投稿のご案内

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2008 年 84 巻 p. 122-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_122

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第158回例会開催のご案内

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2008 年 84 巻 p. 123-
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DOIhttps://doi.org/10.14825/kaseki.84.0_123

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平成19年度一般会計決算・平成20年度一般会計予算(案)

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2008 年 84 巻 p. App3-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_App3

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日本古生物学会入会申込書

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2008 年 84 巻 p. App4-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_App4

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「化石」投稿原稿整理カード

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2008 年 84 巻 p. App5-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_App5

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日本古生物学会出版物特別割引販売のお知らせ

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2008 年 84 巻 p. App6-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_App6

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行事予定

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2008 年 84 巻 p. App7-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_App7

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奥付

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2008 年 84 巻 p. App8-
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DOIhttps://doi.org/10.14825/kaseki.84.0_App8

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裏表紙

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2008 年 84 巻 p. Cover2-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_Cover2

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CONTENTS

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2008 年 84 巻 p. Cover3-
発行日: 2008/10/01
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DOIhttps://doi.org/10.14825/kaseki.84.0_Cover3

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