巻号一覧
1986 巻 (1986)
- 144 号 p. 479-
- 143 号 p. 409-
- 142 号 p. 341-
- 141 号 p. 275-
前身誌
1986 巻, 142 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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堀内 順治, 木村 達明1986 年 1986 巻 142 号 p. 341-353
発行日: 1986/06/30
公開日: 2010/05/25
ジャーナル フリーMany fossil Ginkgo leaves with well-preserved cuticles were obtained from the Lower Palaeogene Noda Group distributed in the Pacific side of Iwate Prefecture, Northeast Japan. Judging from the occurrence, external morphology and cuticular features, these fossil leaves belong to the same species and were derived from the same population. They are referable to Ginkgo tzagajanica originally described by Samylina from the lowermost Tertiary in the Bureja Basin. In this paper, the detailed description of Ginkgo tzagajanica and its emended diagnosis were given. Variation of the external and cuticular features of these leaves were also discussed. Cuticular features of Ginkgo tzagajanica vary according to the portions of a lamina. This fact shows that careful observation of cuticular data is required when dealing with Ginkgo species by their cuticles. In addition, re-evaluation of some features, said to be diagnostic of Ginkgo leaves, were made based on our fossil and extant leaves. Decrease in development of papillae on the subsidiary and ordinary cells, since the early Tertiary, is recognized among the Tertiary Ginkgo species hitherto known.抄録全体を表示PDF形式でダウンロード (4215K) -
野田 雅之1986 年 1986 巻 142 号 p. 354-365
発行日: 1986/06/30
公開日: 2010/05/25
ジャーナル フリーIn this paper, a new species Inoceramus (Cordiceramus) kawashitai is established. The specimens were occurred from the Upper Coniacian of the Oyubari, Ikushumbets and Obira areas of Hokkaido. The variation of selected characters are examined quantitatively on the basis of measurements and statistics, in addition to traditional observation. The average relative growth of two relations (shell height us. shell length and shell height us. breadth) are also examined. On the ground of its considerably inflated equivalve shell, subquadrate or pentagonal marginal outline and development of three radial ridges, this species is certainly assigned to the subgenus Cordiceramus. But the ontogenetic change of the certain characters does not agree with that of any known species. I point out the significance of the occurrence of Cordiceramus from the Upper Coniacian of Japan, in that it represents the lower part of the range of the subgenus. The phylogenetic relationships with allied species are, however, put off, at present, as a further problem.抄録全体を表示PDF形式でダウンロード (5000K) -
田代 正之, 松田 智子1986 年 1986 巻 142 号 p. 366-392_1
発行日: 1986/06/30
公開日: 2010/05/25
ジャーナル フリーThis paper deals with the description of bivalve fossils from the Lower Cretaceous System of the Sakawa area, Shikoku. Thirty-three species of 24 genera, including four new species, i.e., Cosmetodon tomochiensis, sp. nov., Parvamussium tosaense, sp. nov., Parvamussium kattoi, sp. nov. and Protocardia (Protocardia) amanoi, sp. nov., are described from various localities in this area. The bivalve fauna of the Bunjo Formation is nearly identical with that of the Aptian Hagino Formation of the Monobe area, Shikoku. Judging from the bivalve fauna and associated ammonites, the Yotsushiro Formation and the upper member of Tosakamo Formation are closely similar in their faunal compositon to each other and are probably correlated with the upper part of the Hibihara Formation (mainly Albian) of the Monobe area. The faunas of the lower member of Tosakamo Formation and Kurohara Formation closely resemble that of the lower part of the Hibihara Formation (mainly Aptian), having many common species among them. Although the geological age of the lower member of Tosakamo Formation, inclusive of the Kurohara Formation, is suggested at the Apitan and nearly the same as the presumable age of the Bunjo Formation, the bivalve fauna of the Bunjo Formation is quite different from that of the lower member of Tosakamo Formation except for the occurrence of several worldwide bivalve species and ammonites. The difference is probably due to ecological dissimilarity between them.抄録全体を表示PDF形式でダウンロード (4108K) -
田沢 純一, 加藤 誠1986 年 1986 巻 142 号 p. 393-399
発行日: 1986/06/30
公開日: 2010/05/25
ジャーナル フリーStriatifera striata (Fischer de Waldheim, 1837) and Gigantoproductus sp. are described from the lowest part of the Ichinotani Formation (Upper Visean) in Fukuji, Central Japan. S. striata is a large-sized linoproductid, distributed in the Upper Visean and Lower Namurian (rarely Upper Tournaisian) of the Old World, viz. Britain, France, Belgium, Germany, weastern part of the U. S. S. R., South China and Japan.抄録全体を表示PDF形式でダウンロード (1296K) -
永広 昌之, 下山 正一, 村田 正文1986 年 1986 巻 142 号 p. 400-408_1
発行日: 1986/06/30
公開日: 2010/05/25
ジャーナル フリーFive specimens of the Middle to Upper Permian ammonoids, Stacheoceras otomoi, sp. nov., S. sp. and Timorites intermedium (Wanner) are described from the Ogatsu, Utatsu and Okago districts in the Southern Kitakami Massif. Stacheoceras sp. from the Okago district occupies the highest stratigraphic horizon of the genus in Japan. Timorites from the Utatsu district is associated with the Dzhulfian ammonoids. Thus the genus Timorites ranges upward to the Dzhulfian, in Japan.抄録全体を表示PDF形式でダウンロード (2019K)
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