著者
上野 輝弥 坂本 一男
出版者
国立科学博物館
雑誌
Bulletin of the National Science Museum Ser. C Geology & Paleontology (ISSN:0385244X)
巻号頁・発行日
vol.20, no.3, pp.p109-117, 1994-09

A fossil slender mola from the Middle Miocene Hiranita Formation, Chi-chibumachi Group, Saitama Prefecture, Japan is described as a new species Ranzania ogaii in the family Molidae (Tetraodontiformes). This new species is characterized by having closely attached, long neural spines in the caudal vertebrae and unique scale plates that have a single prominent tubercle at the center of each regularly-shaped, polygonal scale plate in the middle of the body.
著者
加瀬 友喜 浜田 隆士 児子 修司
出版者
国立科学博物館
雑誌
Bulletin of the National Science Museum. Series C, Geology & paleontology (ISSN:0385244X)
巻号頁・発行日
vol.13, no.1, pp.29-34, 1987-03
被引用文献数
1 or 0

Discovery of hyoliths from the Gedinnian bed of the Lower (to Middle?) Devonian Fukuji Formation in central Japan constitutes the first occurrence of this group from Japan. The operculum shows features much in common with Joachimilites MAREK, 1967 that was previously known only from the Ordovician bed in Bohemia. It now appears that the genus ranges from the Ordovician (Caradocian) to Early Devonian. The Fukuji species, Joachimilites fukujiensis, is described as new.
著者
宮脇 律朗 松原 聰 橋本 悦雄
出版者
国立科学博物館
雑誌
Bulletin of the National Science Museum. Series C, Geology & paleontology (ISSN:0385244X)
巻号頁・発行日
vol.23, no.1, pp.27-33, 1997-06

Elyite from the Mizuhiki mine, Fukushima Prefecture, is found as fibrous crystal groups in tiny vugs of limonitic ore coposed of supergene galena and chalcopyrite. This is the first occurrence of this mineral in Japan. The averaged chemical analysis by EPMA gave PBO 80.49 CuO 6.71,SO_3 7.70,H_2O (by difference) 5.10wt%, yielding the empirical formula Pb_<3.99>Cu_<0.94> (SO_4)_<1.07> [O_<0.73>(OH)_<6.28>]_<7.01> on the basis of total cations=6 in anhydrous part. The X-ray single crystal study indicated elyite to be monoclinic P2_1/c with a=14.244(1), b=11.536(1), c=14.656(1)A, β=100.45(1)°.
著者
DAVIS P. G.
出版者
国立科学博物館
雑誌
Bulletin of the National Science Museum. Series C, Geology & paleontology (ISSN:0385244X)
巻号頁・発行日
vol.22, no.3, pp.91-106, 1996-12

Archaeopteryx is the oldest known undisputed bird. It is also the most famous and well studied fossil bird taxa. Although the taxonomy of the two known species of Archaeopteryx has been discussed, little information on the taphonomy of the skeletal specimens has been included in these papers. The aim of this paper is to review the mainly anecdotal information published upon the taphonomy of Archaeopteryx and in the light of new techniques in avian taphonomy, reassess and produce a taphonomic history for the specimens.
著者
松川 正樹 小畠 郁生
出版者
国立科学博物館
雑誌
Bulletin of the National Science Museum. Series C, Geology & paleontology (ISSN:0385244X)
巻号頁・発行日
vol.11, no.1, pp.9-36, 1985-03
被引用文献数
7 or 0

This paper describes some imprints on the surface of a cliff of the Lower Cretaceous Sebayashi Formation at Sebayashi, Nakazato-village, Tano-county, Gunma Prefecture, Japan, and interprets the cause of the formation of imprints on the basis of thier morphology and distribution with reference to the sedimentary environments of the Sebayashi Formation. The imprints are made up of two groups : one consists of three deep imprints which stand in a row toward the strike in the central zone of the cliff surface (A group); the other consists of imprints of fairly shallow, depressive and various shapes which form a narrow zone from the lowest margin of the mid-breadth of the cliff to the right margin of the mid-hieght (B group). These imprints are interpreted to be dinosaur footprints on the basis of their morphology, size, development of cracks around imprints, resemblance to some iguanodontid footprints, and the regular space between two prints of the same kind and the width of the tracks. A few trackways consisting of these imprints are interpreted to be formed by three or more dinosaurs.
著者
呂 君昌 冨田 幸光 東 洋一 董 枝明 李 隆濫
出版者
国立科学博物館
雑誌
Bulletin of the National Science Museum. Series C, Geology & paleontology (ISSN:0385244X)
巻号頁・発行日
vol.30, pp.95-130, 2004-12

Nemegtia barsboldi gen. et sp. nov. here described is a new oviraptorid dinosaur from the Late Cretaceous (mid-Maastrichtian) Nemegt Formation of southwestern Mongolia. It differs from other oviraptorids in the skull having a well-developed crest, the anterior margin of which is nearly vertical, and the dorsal margin of the skull and the anterior margin of the crest form nearly 90°; the nasal process of the premaxilla being less exposed on the dorsal surface of the skull than those in other known oviraptorids; the length of the frontal being approximately one fourth that of the parietal along the midline of the skull. Phylogenetic analysis shows that Nemegtia barsboldi is more closely related to Citipati osmolskae than to any other oviraptorosaurs.
著者
Olson Storrs L. 長谷川 善和
出版者
国立科学博物館
雑誌
Bulletin of the National Science Museum. Series C, Geology & paleontology (ISSN:0385244X)
巻号頁・発行日
vol.11, no.3, pp.137-140, 1985-09

A femur of early middle Miocene age (Hemingfordian correlative) of Honshu, Japan, that had previously been referred to the Phalacrocoracidae is here reidentified as that of a member of the Plotopteridae, an extinct family of diving birds belonging to the order Pelecaniformes. Because of the small size of the specimen it is assigned to the genus Plotopterum, heretofore known only from lower Miocene rocks of California, and it provides the youngest known occurrence of the family.