巻号一覧
1996 巻 (1996)
- 184 号 p. 555-
- 183 号 p. 485-
- 182 号 p. 413-
- 181 号 p. 337-
前身誌
1996 巻, 181 号
選択された号の論文の5件中1～5を表示しています
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TOSHIO KOIKE1996 年 1996 巻 181 号 p. 337-346
発行日: 1996/04/30
公開日: 2010/05/25
ジャーナル フリーThe Lower Triassic Griesbachian conodonts, Hindeodus parvus (Kozur and Pjatakova) and Isarcicella isarcica (Huckriede), occur in partly dolomitized dark gray carbonaceous pelagic limestones in Southwest Japan, i.e. the Taho Formation in Tahokamigumi, Shirokawa-cho, Higashiuwa-gun, Ehime Prefecture and the Kamura Formation in Kamura, Takachiho-cho, Nishiusuki-gun, Miyazaki Prefecture. The Griesbachian carbonate rock of the Taho Formation is underlain conformably by light gray dolomitic limestone including the Permian fusulinid Staffella sp. The carbonate rock of the Kamura Formation is also underlain conformably by dolostone of the Upper Permian Mitai Formation. This is the first confirmation of the Griesbachian in Japan.抄録全体を表示PDF形式でダウンロード (1667K) -
SHUJI NIKO1996 年 1996 巻 181 号 p. 347-360
発行日: 1996/04/30
公開日: 2010/05/25
ジャーナル フリーSeven species of Lochkovian (Early Devonian) pseudorthoceratid cephalopods are described and figured from the D1 member of the Fukuji Formation in Gifu Prefecture, central Japan. The fauna includes two pseudorthoceratines : Fukujiceras kamiyai gen. et sp. nov. and an indeterminate genus and species of the subfamily ; four spyroceratines : Spyroceras fukujiense sp. nov., Spyroceras melolineatum sp. nov., Hamadaites labyrinthus gen. et sp. nov. and Mitorthoceras? kamitakarense sp. nov.; and a cayutoceratine : Buchanoceras sp. The occurrence of Early Devonian pseudorthoceratids is first reported in Japan. The description of the new genera is made placing emphasis on ontogenetic variations, especially early juvenile shell morphology. The fauna may represent warm-temperate water conditions.抄録全体を表示PDF形式でダウンロード (7727K) -
TAKASHI MATSUBARA1996 年 1996 巻 181 号 p. 361-374
発行日: 1996/04/30
公開日: 2010/05/25
ジャーナル フリーFifteen species of Gastropoda, obtained from the Koiwai Mudstone, Sandstone and Conglomerate Member of the Yotsuyaku Formation, are described herein. Of these, two, Tateiwaia chinzeii and "Ocenebra" katayamai, are described as new species.抄録全体を表示PDF形式でダウンロード (2270K) -
TATSURO MATSUMOTO, AKITO ASAI1996 年 1996 巻 181 号 p. 375-387
発行日: 1996/04/30
公開日: 2010/05/25
ジャーナル フリーAbstract. In this paper Inoceramus kamuy n. sp. is established on a fairly large number of specimens from Hokkaido. It ranges throughout the lower Turonian strata and is certainly useful for correlation. In its juvenile growth stages, I. kamuy closely resembles I. nodai of late Cenomanian age, but differs in later growth stages in that its valve is extended straight to the ventral extremity and tends to be differentiated into a moderately inflated main part and a somewhat flattened posterior part. Although there are some differences, I. kamuy has affinities with I. atlanticus, I. nodai and probably I. rutherfordi of middle to late Cenomanian age. These species may be affiliated with a group originated from I. virgatus and, thus, belong to Inoceramus in a broad sense. On the other hand, I. kamuy is not likely to be ancestral to the I. (I.) hobetsensis and I. (I.) Iamarcki groups of middle Turonian age. In view of some similarity and variability in shell shape and ornament, we suggest that I. kamuy may be an indirect source from which, in the late Turonian, I. teshioensis, I. costellatus, and I. perplexus (with rather uniformly convex valves) and I. longealatus (with posterodorsally flattening) may have been derived. However, the linking forms should be sought in the middle part of the Turonian. Several species of latest Turonian to Coniacian age, such as I. frechi, I. glatziae and I. multiformis, are seemingly similar to I. kamuy in some of their particular characters, but their phylogenetic relationships with I. kamuy have yet to be worked out.抄録全体を表示PDF形式でダウンロード (3728K) -
NAOKI KOHNO1996 年 1996 巻 181 号 p. 388-404
発行日: 1996/04/30
公開日: 2010/05/25
ジャーナル フリーAbstract. A partial cranium of a fossil pinniped from late Middle Miocene rocks (ca. 12.0-13.6 Ma) in Mito City, Ibaraki Prefecture, Central Japan, is described as a new species, Allodesmus naorai. The holotype of A. naorai was previously known only by a plaster cast of the "lost specimen" in the collections at the U.S. National Museum of Natural History, but recently the original specimen was rediscovered in the Naora collection at the National Museum of Japanene History. A phylogenetic analysis indicates that A. naorai is the sister taxon of A. packardi, and they form a "broad head" subgroup within the genus. The "broad head" subgroup is placed as the sister group to the A. kernensis-A. sinanoensis species group, which forms a "long head" subgroup within the genus. Allodesmus courseni is the most generalized species among five species known within the genus. These five species and other material referred to the Allodesminae described herein from the western North Pacific indicate that the Allodesminae dominated along the shore of the North Pacific Ocean during the late Middle Miocene and became extinct by the end of the Middle Miocene, probably because of the change to a cooler marine climate.抄録全体を表示PDF形式でダウンロード (3317K)
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