Language：English   Publishing type：Research paper (scientific journal)   Publisher：BAILEY-MATTHEWS SHELL MUSEUM  

The arcid bivalve, Arca (Arca) budoensis new species, is described from the Budo Mudstone Member of the Asahi Formation in northern Niigata Prefecture, central Honshu. The age of the member has been assigned to 16.6-15.9 Ma (late early Miocene) on the basis of dinoflagellate cysts. Judging from the arcid, dinoflagellate cysts and sedimentary facies, the paleoenvironment of the member was a shallow embayinent influenced by a warm-water current. The reason that the molluscan fauna of the Budo Member contains no characteristic species of the subtropical to tropical Arcid-Potamid fauna (17.0-16.7 Ma) is that the Budo fauna is slightly later than that Arcid-Potamid fauna. Because the new species resembles fossil and Recent species of the eastern Pacific, A. budoensis is accepted as derived from an ancestor that migrated westward to Asia. The senior author, Kazutaka Amano, is the single author of the new species.

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The cuspidariid bivahfe, Myonera inouei new species, is described from a Paleocene (upper Selandian) calcareous concretion probably derived from the Tomikawa Sandstone and Conglomerate Member in eastern Hokkaido, northern Japan. This is the oldest record of this genus. Myonera inouei possibly lived in upper bathyal depths. It provides another example of taxa of deep-sea origiii in the Paleocene. The senior author, Kazutaka Amano, is the single author of the new species.

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Two early Carboniferous brachiopod species, Levitusia humerosa (Sowerby) and Grandispirifer mylkensis Yang, are described from Japan for the first time. These species, from the middle part of the Arisu Formation in the Okuhinotsuchi area, South Kitakami Belt, indicate an early Visean age. Therefore, the middle part of the Arisu Formation is correlated with the lower Visean. In terms of palaeobiogeography, occurrence of the two species suggests that South Kitakami was probably the eastern extension of the North China Province, and located near and to the east of North China (Sino-Korea) during the early Visean.

DOI： 10.2517/2018PR019

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Five species of bivalves and two species of gastropods are described from late Selandian to earliest Thanetian wood-fall communities from the Katsuhira Formation in Urahoro Town, eastern Hokkaido, northern Japan. Three bivalves and two gastropods are new to science: Thyasira (Thyasira) oliveri Amano and Jenkins, new species, Astarte (Astarte) paleocenica Amano and Jenkins, new species, Poromya katsuhiraensis Amano and Jenkins, new species, Neverita majimai Amano and Jenkins, new species, and Biplica paleocenica Amano and Jenkins, new species. Poromya katsuhiraensis n. sp. and Neverita majimai n. sp. are the earliest records of their genus. Astarte paleocenica n. sp. is the last species before the genus disappeared from the northern Pacific region during the Eocene, only to reappear with the opening of the Bering Strait during the latest Miocene. Moreover, two bivalve species and one gastropod genus are Cretaceous relict forms: Propeamussium yubarense (Yabe and Nagao, 1928), Myrtea ezoensis (Nagao, 1938), and Biplica Popenoe, 1957. These species and other relict protobranch bivalves had wide geographical ranges in the deep sea during the Cretaceous, which helped them to survive the end-Cretaceous mass extinction. The chemosynthesis-based species Bathyacmaea? sp., Myrtea ezoensis, and Thyasira oliveri n. sp. were recovered, but small bathymodioline mussels have not been found. This confirms that the small deep-sea mussels did not appear in the wood-fall communities at least by the earliest Thanetian.

DOI： 10.1017/jpa.2017.137

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The opening of the Paleo-Tethys are reconstructed, including the depositional setting and redox conditions, based on an analysis of radiolarian fossils and the geochemistry of a Devonian siliceous succession in the Chiang Dao area of northern Thailand. The succession is subdivided into the following five rock types (in ascending stratigraphic order): black shale (Lower Devonian), siliceous shale (Middle Devonian), tuffaceous chert and tuff (Middle/Upper Devonian), and chert (Upper Devonian). The succession was deposited in continental margin and pelagic environments between the Sibumasu Block and the Indochina-North China blocks. The concentrations of terrestrial-derived elements (Al2O3, TiO2, Rb, and Zr) suggest that the succession (except for the chert) was supplied with terrigenous material and volcanic ash from the adjacent continent, deposited within a SiO2-rich environment. Geochemical indicators of redox conditions (total organic carbon and the Th/U ratio) reveal a gradual change from anoxic to oxic oceanic conditions between the black shale and chert. Taking into account the interpreted depositional setting and redox conditions, the initial Paleo-Tethys developed as a small, closed anoxic-suboxic oceanic basin during the Early to Middle Devonian, located close to the continental margin. Black shale and siliceous shale were deposited in the basin at this time. Opening of the Paleo-Tethys started around the Middle and Upper Devonian boundary, marked by voluminous volcanic activity. The tuffaceous chert was deposited under oxic conditions, suggesting that ash and pumice within the chert were derived from a continental source. After the Late Devonian, the Paleo-Tethys developed as a deep, broad ocean in which pelagic chert was deposited. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.palaeo.2010.08.029

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：PALAEONTOLOGICAL SOC JAPAN  

The Tertiary Tainohata Formation of the Kobe Group has yielded 10 species of Gastropoda and 19 species of Bivalvia. The formation is of late Middle Eocene age on the basis of the dinoflagellate cyst assemblage and radiometric data. The occurrences of the genera Trinacria, Vicarya, and Sulcobuccinum strongly support an Eocene age for the Tainohata Formation. The molluscan fauna shows high endemism at the species level, whereas it is characterized by Tethyan-Indo-West Pacific genera. Two indigenous molluscan assemblages, Potamides-Cyclina and Corbicula, were discriminated. The composition of these assemblages compares with those of the Neogene intertidal assemblages in embayments. This fact indicates that "temporal parallelism" in the shallow embayment assemblages can be traced back to the late Middle Eocene age in the Japanese Islands.The following 10 new species are proposed herein: Potamides huzitai sp. nov., Cerithideopsilla hondai sp. nov., Crepidula tainohataensis sp. nov., Cantharus (s.l.) andoi sp. nov., Barbatia nodai sp. nov., Trinacria nipponica sp. nov., Trapezium (Neotrapezium) kobe sp. nov., Tellina (Gastranopsis?) sumaensis sp. nov., Corbicula (Corbicula) uejii sp. nov., and Pitar ozakii sp. nov.

DOI： 10.2517/1342-8144-14.2.119

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Other Link： http://hdl.handle.net/10191/17774

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：MICROPALEONTOLOGY PRESS  

This study establishes for the first time in Japan a Paleogene dinoflagellate cyst biostratigraphic zonation, which enables dating and correlation of Paleogene shallow marine sediments in the northwestern Pacific where other marine planktonic microfossils are extremely rare. This study uses previously-dated outcrop sections in northern Japan and proposes nineteen dinoflagellate cyst biozones for the interval of the Paleocene-Lower Miocene, except the middle Middle Eocene where appropriate marine sections were not available. Comparison between assemblages from various other localities in Japan and Sakhalin Island, Far East Russia, confirms that the biostratigraphic zonation proposed here is applicable to the northern Japan and Sakhalin region. The taxonomic part describes 36 taxa that include three new species, Spinidinium pentagonum Kurita, sp. nov. from the Eocene, and Spinidinium? tripylum Kurita, sp. nov. and Williamsidinium diaphanes Kurita, sp. nov. from the Oligocene.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：BLACKWELL PUBLISHING ASIA  

A controversial stratigraphic section, the Taneichi Formation, is exposed along the Pacific Coast of northeastern Honshu, the main island of the Japanese Archipelago. Although most sediments of the formation have long been dated as late Cretaceous, the northern section of it has been assigned to (i) the Upper Cretaceous; (ii) the Paleogene; or (iii) the Neogene. In the present report, we present the data of palynological and sedimentological studies, showing that the northern section should be assigned to the Neogene. A more important point in the present study is that we invoke some basic principles of fluvial sedimentology to resolve this stratigraphic subject. The lignite layers full of Paleogene-Miocene dinoflagellate cysts and pollen assemblages drape over the boulder-sized (>40 cm in diameter) clasts in the northern section. However, the layers totally consist of aggregates of small lignite chips, indicating that the lignites are allochthonous materials. The mega-clasts with derived microfossils in the lignites are thought to have been deposited as Neogene fluvial (flood) sediments in the newly formed Japanese Archipelago. Prior to the Miocene, the northern Honshu was part of the Eurasian Plate, thus the boulder-sized clasts cannot be envisaged as long river flood deposits along the continental Paleogene Pacific Coast. Instead, the mega-clasts with the draping lignites were probably derived from nearby Miocene highlands in the newly born island arc.

DOI： 10.1046/j.1440-1738.2003.00399.x

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Language：Japanese   Publisher：The Geological Society of Japan  

Geologic age of the "Miocene" Iwaya Formation in Awajishima Island is examined by means of calcareous nannofossils and dinoflagellate cysts. Calcareous nannofossil flora indicates biozone NP 17 to NP 20 or CP 14 b to CP 15 b and a late Middle Eocene to Late Eocene age. The dinoflagellate cyst assemblages also show approximately the same age. These results reveal that the Iwaya Formation is the constituent of the Eocene-Oligocene Kobe Group.Molluscan assemblages resembling those from the Iwaya Formation have been known from the "Setouchi Miocene Series" in the coastal area of the eastern Seto Inland Sea. Molluscan fauna and stratigraphic correlation of the "Miocene" in this area should also be re-examined on the basis of precise geochronologic data.

DOI： 10.5575/geosoc.106.379

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Other Link： http://hdl.handle.net/10191/17806

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Tokyo Geographical Society  

This paper aims, on the basis of marine and terrestrial palynology (dinoflagellate cysts and pollen), to discuss ages, paleovegetation, and paleoclimate of Tertiary sections from the Makarov, Aleksandrovsk-Sakhalinskiy and Schmidt Peninsula areas, Sakhalin Island, Far East Russia.<BR>The present study of dinoflagellate cysts has drawn good age constraints on most of the sections as follows: upper Lower? to Upper Oligocene (the Gastellov and Kholmsk-Nevel'sk Formations in the Makarov area and most of the Tumi Formation in the Schmidt Peninsula area), lower Lower Miocene (the uppermost part of the Tumi Formation and the lower part of the Pili Formation in the Schmidt Peninsula area) and upper Lower to lower Middle Miocene (the Kurasi Formation and the First Member of the Maruyama Formation in the Makarov area and the Sertunai Formation in the Aleksandrovsk-Sakhalinskiy area).<BR>Pollen assemblages from the upper Lower to lower Middle Miocene sediments, the Verkhne Due Formation and the lower part of the Kurasi Formation in the Makarov area, and the Verkhne Due and Sertunai Formations in the Aleksandrovsk-Sakhalinskiy area, are correlative to those from sediments in northern Japan that yielded the Daijima-type flora. Those Sakhalin assemblages indicate a temperate paleovegetation similar to that indicated by coeval assemblages from the northern part of Hokkaido. This suggests that the latitudinal gradient in paleovegetation/paleoclimate was relatively minor between Sakhalin Island and Hokkaido during the late Early to early Middle Miocene.

DOI： 10.5026/jgeography.109.2_187

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DOI： 10.3720/japt.65.58

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Sparse occurrences of organic-walled dinoflagellate cysts were recorded from the JAPEX/JNOC/GSC Mallik 2L-38 gas hydrate research well, Mackenzie Delta area, Northwest Territories, Canada. Some of the recorded taxa are indicative of a Paleocene-Eoceneage, while others are considered to be of Cretaceous origin. Because the deepest parts of the section are correlated to the Oligocene Kugmallit Sequence, all the dinoflagellate cysts are interpreted to be reworked. According to this interpretation, the total absence of in situ marine dinoflagellate cysts suggests that the studied samples were deposited under nonmarine conditions, most likely within a fluvial system.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Geological Society of Japan  

Cenozoic clastic sediments in the Kuma area, Shikoku, southwest Japan, previously designated as the Kuma Group, are here redefined as the Hiwada-toge Formation and the overlying Kuma Group sensu stricto, considering a significant time-gap between them. The Hiwada-toge Formation is Early Eocene in age on the basis of dinoflagellate cysts, while the lower part of the Kuma Group s.s. (Sagayama Formation) was dated as late Early Miocene by fission-track dating. Organic microfossil assemblages show that the Hiwada-toge Formation contains marine strata and the lower part of the Kuma Group s.s. (Sagayama Formation) is of non-marine origin.These results provide two geochronological constraints critical to the regional tectonic history.The age of the Hiwada-toge Formation indicates that the Sanbagawa metamorphic rocks came under subaerial erosion by Early Eocene in its provenance area. The relationship between the Median Tectonic Line (M.T.L.) and the northern extension of the Miocene Kuma Group s.s. and its contiguous strata shows that a compressional activity of the M.T.L. occurred during a relatively short period in late Early to Middle Miocene.

DOI： 10.5575/geosoc.105.305

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Language：Japanese   Publisher：The Geological Society of Japan  

DOI： 10.5575/geosoc.104.143

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Other Link： http://hdl.handle.net/10191/17797

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DOI： 10.5575/geosoc.104.56

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Authorship：Lead author   Language：Japanese   Publisher：The Geological Society of Japan  

DOI： 10.5575/geosoc.104.808

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Other Link： http://hdl.handle.net/10191/17798

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DOI： 10.3720/japt.62.13

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DOI： 10.5575/geosoc.103.1179

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Shallow marine deposits of the Paleocene Turtle Mountain Formation on the northeastern flank of the Williston Basin, southwestern Manitoba, yielded dinoflagellate assemblages which include Senegalinium microgranulatum, S. obscurum, Senegalinium sp., Spinidinium densispinatum, S.? pilatum, Cerodinium speciosum, Isabelidinium viborgense and Phelodinium magnificum. The assemblages indicate that the Turtle Mountain Formation is Early to early Late Paleocene in age. Low species diversity and high dominance of a few species are characteristics of the assemblages and suggest a nearshore depositional environment for the formation. Additional investigation of dinoflagellates of the Cannonball Formation in southcentral North Dakota confirms an early Late Paleocene age which permits correlation of the Cannonball Formation with the upper part of the Turtle Mountain Formation. Distinct similarities are present in dinoflagellate assemblages of Paleocene marine deposits within the Williston Basin. The assemblages also have marked similarities with Paleocene assemblages of the eastern Gulf Coastal Plain, U.S.A., which suggests extension of the Gulf sea into the Williston Basin during the Paleocene. © 1995 by AASP Foundation.

DOI： 10.1080/01916122.1995.9989455

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Authorship：Lead author   Language：English   Publishing type：Research paper (bulletin of university, research institution)  

Twenty-nine genera and 45 species of dinoflagellates were recorded from the Upper Cretaceous Bearpaw Formation at surface localities in the Rocky Mountain Foothills and in the southern Alberta Plains. The diverse dinoflagellate assemblages indicate that the formation is Late Campanian in the plains and the foothills of southern Alberta. The maximum western extent of the Bearpaw Sea was in the Late Campanian. Stratigraphic trends in diversity and dominance of species in the assemblages are interpreted as indicating a relatively rapid initial transgression and a gradual final regression during the period of deposition. -from Authors

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Dinoflagellate assemblages in marine late Middle Eocene to Early Oligocene formations in northern Japan are exceptionally limited in diversity and generally dominated by Trinovantedinium boreale. Other species in the assemblages include Bellatudinium hokkaidoanum Kurita and Matsuoka, sp. nov., Paralecaniella indentata, and Selenopemphix spp. The ''restricted flora'' developed particularly in Hokkaido, where earlier studies indicated a paleoenvironment of relatively shallow embayment with saline, stratified water. The persistent restriction in species composition was presumably influenced by the stratification and relatively low water temperature. The assemblages were also possibly influenced by high phytoplankton productivity which enhanced the dominance of peridiniacean forms. B. hokkaidoanum Kurita and Matsuoka, sp. nov. and the wide morphological variation of T. boreale are described.

DOI： 10.1016/0034-6667(94)90047-7

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Palynological studies on the coal-bearing Haboro Formation in the Haboro area have revealed that the formation is latest Paleocene to earliest Eocene in age. This conclusion suggests that the Paleogene sedimentary basin was formed by the early Early Eocene through central Hokkaido, where Paleogene clastic sequences were regionally developed. -from English summary

DOI： 10.5575/geosoc.100.292

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Thick siliciclastic sediments ranging in age from Cretaceous to Quaternary are widely exposed in Haboro area. From the interpretation of new biostratigraphic and radiometric data and the re-evaluation of earlier data, including pollen assemblages, it is concluded that the age of the Haboro Formation and the lower part of the Sankebetsu Formation ranges from Paleocene to late Eocene, while the upper part of the Sankebetsu Formation is early Miocene. This scheme recognizes a major time gap in the middle of the Sankebetsu Formation. -from English summary

DOI： 10.5575/geosoc.98.259

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Language：Japanese   Publisher：The Geological Society of Japan  

DOI： 10.5575/geosoc.92.167

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Other Link： http://hdl.handle.net/10191/17789

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Language：English   Publisher：Niigata University  

This article reports field observation of Paleogene clastic successions in two areas in north-western Kyushu and provides a preliminary interpretation of their sedimentary environments on the basis of lithological facies. In the sections from Sakito-Oshima Island, the Ichigoshima, Sakito, Maze and Tokuman Formations were logged. They are, except their basal part, interpreted to represent an overall transgression from fluvial, estuarine, shelf, and then to deep marine environments during the latest Eocene to Early Oligocene. A sedimentary cycle of a Middle Eocene age from nonmarine, to deep marine, and then to shallow marine environments was able to be reconstructed from the observation in the sections from the Amakusa-Shimoshima area, where the Fukuregi, Shikiyama and Toishi Formations were examined. These evidence will be adapted in the interpretation of fossil dinoflagellate cysts and molluscs which is the principal intent of the present project.

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Language：Japanese   Publisher：海洋出版  

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Language：Japanese   Publisher：海洋出版  

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Language：Japanese   Publisher：堆積学研究会  

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Language：Japanese   Publisher：The Japanese Association for Petroleum Technology  

Dinoflagellate cysts are organic-walled, acid-resistant microfossils which are common in marine sediments from Triassic to Recent. The significance of these microfossils has ever been emphasized in oil industry as they contribute well to formation correlation and paleoenvironmental analyses. This article reviews biological aspects and geological application of fossil dinoflagellate cysts.

DOI： 10.3720/japt.62.321

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Language：Japanese   Publisher：The Japanese Association of Organic Geochemists  

DOI： 10.20612/rog.8.0_83

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