Shin-ichi Sano

Shin-ichi Sano
University of Toyama | U Toyama · Department of Earth system science

PhD

About

57
Publications
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746
Citations
Additional affiliations
July 2000 - March 2018
Fukui Prefectural Dinosaur Museum
Position
  • Curator

Publications

Publications (57)
Article
A re-examination of the specimens that were identified as Biradiolites minor Pojarkova from the late Campanian to early Maastrichtian middle member of the Yigeziya Formation of southwestern Tarim Basin, reveals that they should be assigned to the genus Glabrobournonia Morris and Skelton. Glabrobournonia is a group of radiolitids characterized by th...
Article
Sedimentological, geochemical, and chronological analyses were carried out on 18 carbonate rock samples collected at depths of 938, 1085, and 3354 m on the western slope of Minamitorishima (Marcus Island), which is located near the western margin of the Pacific Plate. Four groups of carbonate rocks were distinguished: a mollusk‐rich limestone, a co...
Article
Full-text available
Rudists are a group of bizarrely shaped marine bivalves that lived in the Tethys Ocean from the Late Jurassic to the latest Cretaceous. They are morphologically variable, including snail-like, cup-like, and horn-like shapes. In the Middle East, Cretaceous carbonates with rudists and rudist fragments are well exposed in many outcrops as well as oil...
Article
Studying marine paleobiogeographical conditions in the mid-latitudes of the Northwest Pacific around the Jurassic–Cretaceous boundary would be expected to contribute to a better understanding of the paleoclimatic and/or paleoenvironmental background of the evolution of the Late Mesozoic terrestrial ecosystem in East Asia. However, uncertainty about...
Article
A new polyconitid rudist Shajia tibetica gen. et sp. nov., of late Aptian to Albian age, is described from the Langshan Formation of Nyima County, northern Lhasa Block, Tibet. Though comparable in size and external morphology with Horiopleura haydeni Douvill�e, which is a common endemic species in southwestern Asia, Shajia differs from the latter s...
Article
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Recent stratigraphic reviews suggested that the Kuzuryu Subgroup should be excluded from the Tetori Group (sensu lato), as in the original definition of the group by Oishi (1933b). Here, we redefine the Tetori Group following Oishi s (1933b) definition and designate the Itoshiro area in the Kuzuryu region, Fukui Prefecture, the Hakusan Geological R...
Article
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The uppermost Jurassic to Lower Cretaceous Tetori Group is the shallow marine to non-marine siliciclastic stratum in northern Central Japan. Abundant plant macrofossils, marine to freshwater molluscs, and terrestrial vertebrate fossils have been described from this group. The fossils from the Tetori Group represents the biota lived in mid-latitudes...
Article
Guyots are large seamounts with a flat summit that is generally believed to form due to constructional biogenic and/or erosional processes during the formation of volcanic islands. However, despite their large abundance in the oceans, there are still very few direct constraints on the nature and formation of guyots, in particular those formed at hi...
Article
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The comprehensive list of vertebrate skeletal fossils (excluding ichnofossils) from the Early Cretaceous Tetori Group is provided. Numbers of species of selected vertebrate taxonomic groups of the Tetori Group are compared with those from several famous Late Jurassic-Early Cretaceous Lagerstätten to evaluate the vertebrate diversity of the Tetori B...
Article
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Diagnostic characters of the recently established new genus of radiolitid rudist Auroradiolites include an entirely compact outer shell layer, a distinctly convex upper (left) valve and a robust myocardinal apparatus surrounding a strongly internally projected ligamentary infolding. Until now, A. biconvexus (previously considered to be exclusively...
Research
Full-text available
KASHIWAGI, Kenji, Shinji ISAJI and Shin-ichi SANO ,2016, Recognition of a third marine transgression of the Tetori Group in the Setono area, northern Central Japan, with radiolarians indicative of an open marine ocean environment. Mem. Fukui Pref. Dinosaur Mus. 15:7–26. This paper describes the stratigraphy and biofacies of the Lower Cretaceous Kuw...
Article
The Early Cretaceous Tetori Group in northern Central Japan was deposited in the eastern margin of the Asian Continent at mid-latitudes. It consists of two depositional stages: DS2 (Berriasian–late Hauterivian; mainly brackish environment with intercalations of marine horizons) and DS3 (Barremian–Aptian; freshwater environments only). Review of the...
Article
This paper describes the stratigraphy and biofacies of the Lower Cretaceous Kuwajima Formation, a member of the Itoshiro Subgroup of the Tetori Group in the Setono area, Ishikawa Prefecture, Central Japan. This formation is approximately 140 m in thickness and comprises brackish sandy siltstones containing the brackish bivalve Myrene tetoriensis in...
Article
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The stratigraphy of the Tetori Group (sensu lato) and other Early Cretaceous strata in the Hakusan Region in the Hida Belt, northern Central Japan, is reviewed based on recent advances in ammonoid biostratigraphy, U-Pb age determination of zircons using inductively coupled plasma-mass spectrometry with laser ablation sampling (LA-ICPMS), recognitio...
Article
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We report on the first known occurrences of earliest Cretaceous belemnites in Japan, including: Cylindroteuthis aff. knoxvillensis Anderson (Cylindroteuthididae) from the Mitarai Formation (Berriasian) of the Tetori Group in the Shokawa area, Gifu Prefecture, central Japan; and Hibolithes spp. (Mesohibolitidae) from the Isokusa Formation (Berriasia...
Article
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Belemnites were a highly successful group of Mesozoic cephalopods. Their early evolutionary history is, however, still poorly understood. Previously it has been suggested that the Order Belemnitida originated in the earliest Jurassic (Hettangian) with small forms in Europe, and their occurrence was restricted to Europe until the Pliensbachian. Here...
Article
A new polyconitid rudist, Magallanesia canaliculata gen. et sp. nov., of probably late Albian age, is described from the Pulangbato area, central Cebu Island, the Philippines in the western Central Pacific and Takuyo-Daini Seamount, now located in the Northwest Pacific. It is similar to Praecaprotina Yabe and Nagao, 1926, a Japanese–Central Pacific...
Article
Belemnites (Order Belemnitida), a very successful group of Mesozoic coleoid cephalopods, dominated fossil coleoid assemblages throughout the Jurassic and Cretaceous. According to the current view, the phylogenetically earliest known belemnites have been reported from the lowermost Jurassic (Hettangian) of northern Europe. The earliest belemnites ar...
Article
Full-text available
Belemnites (Order Belemnitida), a very successful group of Mesozoic coleoid cephalopods, dominated the world's oceans throughout the Jurassic and Cretaceous. According to the current view, the phylogenetically earliest belemnites are known from the lowermost Jurassic (Hettangian, 201-199 Ma) of northern Europe. They are of low diversity and have sm...
Article
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U-Pb analyses of more than 1,000 single detrital zircons from 16 formations of the Silurian–Lower Cretaceous continuous succession of the South Kitakami Belt (SKB), Northeast Japan, provide a detrital zircon reference for the complex continental-margin orogen of Japan. As a result, three tectonic phases were discriminated. Siluro–Devonian sandstone...
Article
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We carried out a U-Pb geochronological study of the Motodo, Ashidani, and Otani formations in the Hida Gaien Belt of the Kuzuryu area, Fukui Prefecture, in the northeastern part of Southwest Japan, to constrain their age of deposition. The LA-ICPMS U-Pb zircon ages we newly obtained are as follows. Andesitic volcaniclastic conglomerate and tuff bre...
Article
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Ammonoid fossils including Tithonian Parapallasiceras sp. are newly discovered from the Kurotodo Formation of the Tetori Group in the Ono area of the Kuzuryu district, Ono City, Fukui Prefecture in the Hida Gaien Belt, Central Japan. Based on this find, the Kurotodo Formation can now be correlated with the Early Tithonian Kamihambara Formation in t...
Article
A radiolitid rudist, Eoradiolites cf. gilgitensis is described from a late early to late Aptian shallowmarine limestone block in the lower part of the Yezo Group, central Hokkaido, northern Japan. The Hokkaido Eoradiolites is characterized by a compact (non-cellular) outer shell layer, as seen in E. gilgitensis (from Iran, Afghanistan, Pakistan, an...
Article
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Although rudists of Late Jurassic to earliest Cretaceous age are known from Nova Scotia to Japan, the oldest specimens recovered from Pacific seamounts are Barremian (or possibly Hauterivian). The lack of evidence for disjunct endemism limited to either side of the ocean, then, precludes the inference that earlier rudists might have been present wi...
Article
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Deep-Earth convection can be understood by studying hotspot volcanoes that form where mantle plumes rise up and intersect the lithosphere, the Earth’s rigid outer layer. Hotspots characteristically leave age-progressive trails of volcanoes and seamounts on top of oceanic lithosphere, which in turn allow us to decipher the motion of these plates rel...
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A caprinoid rudist, Immanitas anahuacensis Palmer is described from the Budden Canyon Formation in northern California, U.S.A. This is the first unambiguous record of this genus outside central Mexico. The supposed Late Albian age of this genus in Mexico is confirmed by the discovery of the Californian specimen in the Mortoniceras perinflatum zone,...
Article
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The age of non-marine formations of the Tetori Group was reexamined in the Itoshiro and Mana areas in Fukui Prefecture, central Japan. The Tetori Group in the Itoshiro area has been divided into the Kuzuryu, Itoshiro, and Akaiwa subgroups, whereas that in the Mana area is divided into the Middle and Upper formations of the “Kuzuryu Subgroup”. Among...
Article
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Hotspots that form above upwelling plumes of hot material from the deep mantle typically leave narrow trails of volcanic seamounts as a tectonic plate moves over their location. These seamount trails are excellent recorders of Earth’s deep processes and allow us to untangle ancient mantle plume motions. During ascent it is likely that mantle plumes...
Article
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Belemnites (order Belemnitida), a very successful group of Mesozoic cephalopods, provide an important clue for understanding Mesozoic marine ecosystems and the origin of modern cephalopods. Following current hypotheses, belemnites originated in the earliest Jurassic (Hettangian, 201.6-197 Ma) with very small forms. According to this view their pale...
Article
Pachytraga Paquier, 1900, the stratigraphically oldest genus of caprinine caprinid rudist, was previously known from only two chronospecies from a single lineage, that is the Hauterivian P. tubiconcha Astre, 1961 and the early Aptian P. paradoxa (Pictet and Campiche, 1869). Here, a new species, Pachytraga? tanakahitoshii, is erected on the basis of...
Article
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There are few studies on paleoenvironment and paleoecology of the early rudists of Late Jurassic to earliest Cretaceous, though Late Cretaceous rudists have attracted much attention as a major contributor to carbonate platform. Rudist and microencruster framestone was discovered from the Late Jurassic Torinosu-type limestone of the Imaidani Group i...
Article
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The pectinid bivalve genus Neithea is an important indicator for understanding the Cretaceous biogeographic relationships between the Tethyan Realm and peripheral regions. However, its records in the Northeast Pacific have been scarce and Neithea (Neithea) grandicosta Gabb is the only known species from this area, though its stratigraphic range and...
Article
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Belemnites, a very successful group of Mesozoic cephalopods, flourished in Cretaceous oceans until the Cretaceous−Paleogene event, when they became globally extinct. Following this event the modern types of cephalopods (squids, cuttlefish, octopus) radiated in the Ceno- zoic in all oceans. In the North Pacific, however, a turnover from belemnites t...
Article
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Orbitolinid foraminifers supply important information for the understanding of Cretaceous marine biogeographic and paleoclimatic conditions. A pre-requisite for these paleoenviromental interpretations is a sound taxon-omy. The taxonomy of the orbitolinids from the Northwest Pacific has been controversial, and this paper aims at a taxo-nomic and str...
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The Pacific dimension of Late Jurassic to Early Cretaceous rudist evolution shows four phases, which are described in this article in more detail.
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The Louisville Seamount Trail is a 4300 km long volcanic chain that has been built in the past 80 m.y. as the Pacific plate moved over a persistent mantle melting anomaly or hotspot. Because of its linear morphology and its long-lived age-progressive volcanism, Louisville is the South Pacific counterpart of the much better studied Hawaiian-Emperor...
Article
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A single rostrum of Cylindroteuthis (Cylindroteuthis) cf. theofilaktovi Nikitin recovered from the Late Bathonian-Early Callovian Kaizara Formation of the Tetori Group in Shimoyama, Kuzuryu area, Central Japan, is described for the first time in East Asia. This belemnite species has been previously known only from the Early Callovian of Central Ukr...
Article
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Excavated specimens of two primitive rudists, Epidiceras speciosum (Goldfuss) and Epidiceras guirandi (de Loriol), are systematically described for the first time from the Tithonian-Berriasian Torinosu-type limestones of the Torinosu Group in the Sakawa area, Central Shikoku, Southwest Japan. E. guirandi was previously known only from the Late Kimm...
Article
Rudist specimens of Late Albian age from the Upper Chickabally Mudstone Member of the Budden Canyon Formation, Great Valley Sequence, in northern California, are identified as a canaliculate rudist taxon based on shell morphology and mineralogy. Since they are incomplete right valves without cardinal and myophoral parts, their systematic placement...
Article
Full-text available
Rudist specimens of Late Albian age from the Upper Chickabally Mudstone Member of the Budden Canyon Formation, Great Valley Sequence, in northern California, are identified as a canaliculate rudist taxon based on shell morphology and mineralogy. Since they are incomplete right valves without cardinal and myophoral parts, their systematic placement...
Article
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Three species of megalodontoid bivalves: large and small species of megalodontids and Dicerocardium sp., were discovered from the allochthonous limestone block in the Shiriya area, Northeast Japan. Since they are probably different from other Japanese megalodontoids, which were previously described by Tamura (1983) from Southwest Japan, Japanese me...
Article
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A synoptic guide to rudist bivalves from the Late Jurassic-earliest Cretaceous Torinosu-type limestones is provided for future research. Three taxa of early rudists, Epidiceras speciosum, Epidiceras guirandi and Monopleura sp. are recorded from the Torinosu-type limestones in Southwest Japan. E. speciosum is recognized in all four areas: the Youra...
Article
The pectinid bivalve genus Neithea is one of the most important indicators for understanding the biogeographic relationships between the Tethyan Realm and North Pacific Province during the Cretaceous Period. Changes in temporal species diversity, endemic/widespread species composition, and origination and demise ratios of Neithea at each Cretaceous...
Article
Matsukawa et al. present a new interpretation of the age and geological correlation within the Tetori Group. Comparison of their data with our own studies and literatures, we comment on some problems remain unsolved in their paper, such as (1) stratigraphy of the Takinamigawa area, where various fossils including dinosaurs were recovered; (2) recog...
Article
Two rudist taxa, Epidiceras speciosum (Munster) and Monopleura sp. were discovered from the allochthonous Torinosu-type limestone blocks in the Oriai Formation of the Imaidani Group in the Shirokawa area, Southwest Japan. The occurrence of Epidiceras speciosum, indicating a late Kimmeridgian to early Valanginian age, is consistent to the previous a...
Article
The global spatiotemporal distribution of the Cretaceous carbonate platform biota, which is characterized by “tropical” Mesogean (= Cretaceous Tethys) taxa, is an important aspect of Earth's paleobiogeography. All available records of this biota in the Northwest Pacific (Japan and Sakhalin Island) are summarized in order to elucidate its stratigrap...
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Carbonate platforms consisting of hermatypic coral, rudists and larger foraminifers formed along the margin of the NE Japanese islands during the mid-Late Aptian. The geographical northern limit of the carbonate platforms extended to c. 36 degrees N at that time, which is the highest latitude for coral and/or rudist formation in the North Pacific r...
Article
Full-text available
Two rudist taxa, Epidiceras speciosum (Münster) and Monopleura sp. were discovered from the allochthonous Torinosu-type limestone blocks in the Oriai Formation of the Imaidani Group in the Shirokawa area, Southwest Japan. The occurrence of Epidiceras speciosum, indicating a late Kimmeridgian to early Valanginian age, is consistent to the previous a...
Article
Full-text available
In this paper, we describe an Aptian (Early Cretaceous) larger foraminiferal species Orbitolina (Mesorbitolina) parva from the limestone olistoliths in the lower part of the Yezo Group in the Yubari-Ashibetsu area, central Hokkaido and from limestone pebbles in the lowermost part of the Yezo Group in the Nakagawa area, northern Hokkaido. This is th...
Article
Cretaceous greenhouse conditions were characterized by the expansion of Tethyan carbonate platforms on the continental shelf and by widespread deposition of organic-rich sediments representing "oceanic anoxic events (OAEs)". Many Cretaceous carbonate platforms were temporarily drowned several times, indicating that environmental factors frequently...
Article
Carbonate blocks of late Aptian (Lower Cretaceous) age occur in the Lower Yezo Group of central Hokkaido in northeast Japan. The shallow-water carbonates were emplaced by gravity sliding and rock fall into a deep-water flysch basin. Various lithofacies can be distinguished within the blocks including massive wackestone, bedded packstone and micro-o...

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Project (1)
Project
Publication of descriptions, revisions and systematics of rudist taxa for the ongoing revision of the Bivalvia volumes of the 'Treatise on Invertebrate Paleontology'.