Search Results 1-20 of 1184

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2021-04-01

Takahashi Masamichi , Herendeen Patrick S. , Herrera Fabiany , Hirayama Ren , Ando Hisao , Sasaki Kazuhisa , Crane Peter R.

Paleontological Research 25(2), 2021-04-01

DOI
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A Multicarpellary Apocarpous Gynoecium from the Late Cretaceous (Coniacian–Santonian) of the Upper Yezo Group of Obira, Hokkaido, Japan: Obirafructus kokubunii gen. & sp. nov.

Kajita Yui , Hanari Suzuki Mayumi , Nishida Harufumi

Obirafructus kokubunii gen. & sp. nov. (family Incertae Sedis; order Saxifragales) is proposed based on a permineralized reproductive axis bearing at least 42 spi …

Acta phytotaxonomica et geobotanica 72(1), 1-21, 2021

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Provenance Change in Cretaceous–Paleogene Fore-arc in Western Hokkaido: U–Pb Dating of Detrital Zircons from the Yezo Group [in Japanese]

ISHIZAKA Yuto , ISOZAKI Yukio , TSUTSUMI Yukiyasu

… To reconstruct the tectono-sedimentary history of the Cretaceous–Paleogene arc-trench system in western Hokkaido, U–Pb ages were measured of detrital zircons in 11 Cretaceous and Paleogene fore-arc sandstones of the Yezo Group in the Oyubari and Mikasa areas. …

Journal of Geography (Chigaku Zasshi) 130(1), 63-83, 2021

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Chemical and lithium isotope characteristics of murakamiite and Li–rich pectolite from Iwagi Islet, Southwest Japan

IMAOKA Teruyoshi , KIMURA Jun–Ichi , CHANG Qing , ISHIKAWA Tsuyoshi , NAGASHIMA Mariko , TAKESHITA Natsuki

… The albitite forms small bodies that are several tens of centimeters to tens of meters in size, disseminated in a host granite of Late Cretaceous age. …

Journal of Mineralogical and Petrological Sciences 116(1), 9-25, 2021

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Source of the Jurassic Oil in the Western Mahu Sag of Junggar Basin, NW China

XIAO Zhenglu , CHEN Shijia , TANG Longxiang , WANG Guibin , HAN Meimei

… The main hydrocarbon expulsion period of the P1f source rock was between late Permian and middle Cretaceous. …

Journal of the Japan Petroleum Institute 64(2), 67-75, 2021

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Taxonomical Reexamination of the "Pterosaur" (Hitachinaka-ryu) Specimen from the Upper Cretaceous Nakaminato Group [in Japanese]

加藤太一 , 薗田哲平 , 中島保寿 , 安藤寿男

茨城県自然博物館研究報告 = Bulletin of Ibaraki Nature Museum (23), 43-55, 2020-12
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Eighteen Coral Genomes Reveal the Evolutionary Origin of Acropora Strategies to Accommodate Environmental Changes

Chuya Shinzato , Konstantin Khalturin , Jun Inoue , Yuna Zayasu , Miyuki Kanda , Mayumi Kawamitsu , Yuki Yoshioka , Hiroshi Yamashita , Go Suzuki , Noriyuki Satoh

… Molecular dating indicates that the Acropora ancestor survived warm periods without sea ice from the mid or late Cretaceous to the Early Eocene and that diversification of Acropora may have been enhanced by subsequent cooling periods. …

Molecular Biology and Evolution, msaa216, 2020-09-02

IR
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Evolutionary diversification of taiwanioid conifers : evidence from a new Upper Cretaceous seed cone from Hokkaido, Japan

Stockey Ruth A. , Nishida Harufumi , Rothwell Gar W.

Journal of plant research 133(5), 681-692, 2020-09
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Shark teeth from the upper Cretaceous Nakaminato Group in Hitachinaka, Ibaraki Prefecture, Japan [in Japanese]

加藤太一 , 宮田真也 , 河野重範 , 奥村よほ子 , 髙野朋子 , 薗田哲平 , 大倉正敏 , 髙桒祐司 , 安藤寿男

化石研究会会誌 = Journal of fossil research 53(1), 18-28, 2020-07
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Tectonics focused on the basal rocks of the northern marginal Izumi Sedimentary Basin: Stratigraphic reconsideration of the Ohsawa Conglomerate and the Ushitakigawa Rhyolite Lava(Sennann Rhyolites), Southwest Japan [in Japanese]

清家一馬 , 岩野英樹 , 檀原徹

大阪府南部の和泉山脈北麓に狭長に分布する泉南流紋岩類のジルコン FT 年代を4試料測定した.その年代から泉南流紋岩類は東西で地域的な違いが見られず概ね80 ~85 Maの火山活動であることが示唆された.また，泉南流紋岩類牛滝川流紋岩溶岩が露出する牛滝地域の岩相調査により，南部で和泉層群の泥岩・含礫泥岩が典型的な基底礫岩を伴わずに流紋岩に直接累重することがわかった. さら …

大阪市立自然史博物館研究報告 = Bulletin of the Osaka Museum of Natural History (74), 23-43, 2020-03-31

IR DOI
11

Early Cenomanian (Late Cretaceous) Ammonoids from the Miyanohara Formation in the Sakawa Area, Shikoku, Southwestern Japan

Misaki Akihiro , Okazaki Yoshihiko , Mizuno Yoshiaki , Matsunaga Takeshi

Paleontological Research 24(1), 72-72, 2020-01-01

DOI
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Early Cenomanian (Late Cretaceous) ammonoids from the Miyanohara Formation in the Sakawa area, Shikoku, southwestern Japan

MISAKI AKIHIRO , OKAZAKI YOSHIHIKO , MIZUNO YOSHIAKI , MATSUNAGA TAKESHI

Paleontological Research 24(1), 72-81, 2020-01
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Ichnology of Late Cretaceous echinoids from the Maastrichtian Type area (The Netherlands, Belgium) – 4. Shark versus echinoid: failed predation on the holasteroid Hemipneustes

Donovan Stephen , Jagt John

… 115 mm in length) holasteroid sea urchin that is locally common in the upper Maastrichtian (Upper Cretaceous) of the type area of that stage in the south-east Netherlands and contiguous Belgium. …

Bulletin of the Mizunami Fossil Museum 47(0), 49-57, 2020

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Finding Paleogene beds in the uppermost Izumi Group in western Kii Peninsula, SW Japan [in Japanese]

Isozaki Yukio , Hasegawa Ryo , Masuda Harue , Tsutsumi Yukiyasu

… Detrital zircon U-Pb ages were measured for nine non-fossiliferous sandstones from the uppermost Izumi Group, a "Late Cretaceous" forearc clastic sequence in the eastern Izumi Mountains of western Kii Peninsula, SW Japan. … The new age data raise the possibility that a stratigraphic interval across the Cretaceous-Paleogene extinction boundary may be preserved within the group. …

The Journal of the Geological Society of Japan 126(11), 639-644, 2020

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Geological age of the Ayukawa Formation (Oshika Group) in the South Kitakami Belt, Northeast Japan based on the ammonoids

Ehiro Masayuki , Company Miguel , Takaizumi Yukihiro , Hanamatsu Shun-ichi

南部北上帯牡鹿地域の網地島に分布する最上部ジュラ系～下部白亜系鮎川層の長渡頁岩部層最上部から4種のアンモノイド，Olcostephanus atherstoni, O. cf. stephanophorus, Busnardoites</i&g …

The Journal of the Geological Society of Japan 126(10), 563-574, 2020

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Oxygen isotope analysis of Mesozoic radiolarites using SIMS

BÔLE Maximilien , IKEDA Masayuki , O. BAUMGARTNER Peter , HORI S Rie , BOUVIER Anne-Sophie , KUKOČ Duje

化石殻の炭酸カルシウムの酸素同位体比（δ18O）を用いた古海洋研究が広く用いられているが，珪質化石殻については分析の制約や同位体分別の不確定性等のため，古海洋研究への適用例は限られている．本論では，二次イオン質量分析計（SIMS）によって測定した日本，イタリア，スイス，ルーマニアの中生代チャートに含まれる放散虫化石 δ18O 変動の古海洋指標としての有用性について報告する． …

BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 71(4), 355-393, 2020

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Late Jurassic radiolarians from mudstone near the U–Pb-dated sandstone ofthe North Kitakami Belt in the northeastern Shimokita Peninsula, Tohoku, Japan

UCHINO Takayuki , SUZUKI Noritoshi

青森県下北半島の北東部では，北部北上帯に属する付加体が，桑畑山地域，片崎山地域，大森地域に分布している．桑畑山地域の付加体については，後期ジュラ紀の岩屋ユニットと前期白亜紀前半の尻労ユニットに区分されるなど，これまで多くの研究がなされているものの，片崎山・大森地域の付加体については，大森地域の砂岩から砕屑性ジルコン U–Pb 年代が得られているほかは，詳しいデータはほとんどな …

BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 71(4), 313-330, 2020

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Structural and paragenetic evolution of garnet–bearing barroisite schist from the Suo metamorphic complex, SW Japan

ETO Mitsumasa , ENDO Shunsuke

… Two distinct phases of high–strain ductile deformation (D1 and D2) can be recognized in the area, and they are related to early and late stages of exhumation. … The lithological association, deformation structures and metamorphic conditions of the Jurassic Suo metamorphic complex are very similar to those of the Cretaceous Sanbagawa metamorphic complex, suggesting they have comparable exhumation processes as coherent–type high–P/T …

Journal of Mineralogical and Petrological Sciences 115(5), 416-427, 2020

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Early Cretaceous U-Pb dates of zircons from the Kabashima Granite in the Nomo Peninsula, Nagasaki Prefecture, SW Japan [in Japanese]

Nagata Mitsuhiro , Kouchi Yoshikazu , Otoh Shigeru

… The Kabashima Granite has intruded the pre-Cretaceous geological unit in Kabashima Island near the southern tip of the Nomo (Nagasaki) Peninsula, Nagasaki Prefecture, western Kyushu, Japan. … Although previous studies have reported Late Cretaceous (ca. … 93-77 Ma) muscovite and biotite K-Ar dates from this granite body, we obtained only Early Cretaceous (ca. …

The Journal of the Geological Society of Japan 126(6), 333-339, 2020

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Discovery of a simple thalloid liverwort Metzgeriites kujiensis (Metzgeriaceae), a new species from Late Cretaceous Japanese amber

KATAGIRI Tomoyuki , SHINDEN Hisao

… nov. is described from the Late Cretaceous (Santonian, ca. … The new species represents the first record of the liverwort family Metzgeriaceae (Metzgeriales, Marchantiophyta) from the Late Cretaceous from East Asia. …

Hattoria 11(0), 13-21, 2020

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