巻号一覧
46 巻, 544 号
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松本 逹郎1939 年 46 巻 544 号 p. 1-12
発行日: 1939/01/20
公開日: 2008/04/11
ジャーナル フリー(1) Good displays of the Cretaceous formations are found in the Amakusa islands, Mihune district and Onogawa basin which are aligned from west to east in central Kyuyu., Of them those in the first and the third have been already reported by the writer in his previous papers., Since then he has investigated the geology of the second area, with special attention on the geologic phenomena of the Cretaceous period and the result of this survey is described in this paper., (2) The Cretaceous deposits of the district for which he proposes the name of the Mihune group are a stratigraphic unit and are divisible into three minor units as follows : a., Basal formation consists of moderately thick basal conglomerate and other coarse grained deposits 300 m., think in the northern part and of ruddaceous sandstone 50 m., thick in the southern part ; red beds are intercalated at several horizons among these deposits., b., Lower formation, 450 m., thick in the northern part and 700 m., thick in the southern part, consists mainly of sandstone and siltstone deposited in a shallow sea and contains bivalves and gastropods abundantly (see table 1); coal seams are intercalated at places., c., Upper formation, about 750 m., thick, consists of red or variegated fine grained sediments comprising dark green sandstone and siltstone, and siliceous acidic tuff is intercalated at several horizons., Plant remains are found in the sandstone at some places., (3) That the Mihune group can be correlated to the Gosyonoura group in the Amakusa islands and that both of them are middle Cretaceous (or Gyliakian in main), but not lower Cretaceous as has been regarded by previous investigators, are warranted by the palaeontological and stratigraphical evidences., (4) The group has been deposited on the basement of crystalline schists and Palaeozoic sedimentary rocks with a marked unconformity at its base., Both basement complexes are strongly folded and intruded by granitic rocks., The Palaeozoic group can be classified into two, namely, one composed of green rock, phyllite, quartzite and limestone and another of Permian slaty shale with conglomerate, sandstone and lenses of limestone., Judging from the constituents of coarse grained deposits of the Mihune group it is presumed that a part of their material was supplied from a terrain where porphyrite and its allies were extensively exposed under denudation., (5) Structure of the Cretaceous strata is "Bruchfaltung" as is indicated in geologic map and profiles., (6) Through the studies on the Cretaceous formations in central Kyusyu, the writer endeavoured to clarify the relation between two tectogenese, -early Cretaceous Oga movement in the Inner Side and middle Cretaceous Sakawa movement in the Outer Side., As a result of these studies it is determined that central Kyusyu has been a consolidated landmass and maintained a relatively stable condition during and after the time when the Sakawa movement was taking place on the Outer Side., However a certain epeirogenesis took place in this region, introducing a parageosyncline where the middle Cretaceous deposits were accumulated., The succession of these deposits seems to reveal a complete cycle of sedimentation.,抄録全体を表示PDF形式でダウンロード (1537K) -
杉山 敏郎1939 年 46 巻 544 号 p. 13-22
発行日: 1939/01/20
公開日: 2008/04/11
ジャーナル フリーThis is a brief preliminary report with special reference to some new facts found very recently in the Palaeozoic of the Akiyosi District., I) The Palaeozoic of the Akiyosi district is divided by the late Y., OZAWA into three complexes in ascending order : 1) graywacke beds, 2) Akiyosi limestone and 3) shale, sandstone and chert, each with small lenses of limestone., All these complexes belong to the Permian and Carboniferous, according to the fossils they contain., II) The Akiyosi limestone is probably not upset as a whole as once thought by OZAWA, but in part in normal order., III) The graywacke beds and shale beds are in normal order and not upset, so far as evidences shown by cross bedding are concerned., IV) The Akiyosi limestone and graywacke beds are probably in contact by a fault with a general trend NE-SW, coinciding with one of chief tectonic lines in other districts of Tyugoku., OZAWA's well known interpretation of the geological structure of the Akiyosi district seems to me to need certain modification on the several new facts cited above.,抄録全体を表示PDF形式でダウンロード (1493K) -
大塚 彌之助1939 年 46 巻 544 号 p. 23-31
発行日: 1939/01/20
公開日: 2008/04/11
ジャーナル フリー青森縣東部の新生界は中新・鮮新・洪積・冲積の四統よりなり, 何れも海棲軟體動物の遺骸を含む。之等の内洪積統のもはの七戸・古間木・沼崎附近に段丘を作つて發逹し, 數種の半淡水棲種を含む。鮮新統は田名部町の東南丘陵を構成し, 筆者は本統から約35種からなる萬願寺動物群を採集した。本統は田名部町以西下北半島からは發見されてゐない。中新統は田名部町以西の下北半島を構成し, 藥研温泉の附近の藥研川底より中新世軟體動物4種を採集した。次に之等の採集品中注目すべき種及び新種を記載した。抄録全体を表示PDF形式でダウンロード (909K) -
稻垣 誠二1939 年 46 巻 544 号 p. 35-36
発行日: 1939/01/20
公開日: 2008/04/11
ジャーナル フリー該化石は岩手縣二戸郡金田一村湯田産で, その産出層位は大塚學士の下部門ノ澤層群である。標本の保存状態は比較的に良く, 2個體が重なり合つて産す。上部のものは腹部の形態から雌と確認されるが, 下部の性別は判然しない。兩標本とも同一種に屬し, 相模灣以南臺灣に到る本邦近海に産する Scylla serrata (FORSKAL)「ノコギリガザミ」に酷似して居る。亦甲殻の外形は Portunus trituberculatus (MIERS)「ガザミ」のそれにも似て居る。分類上重要な螯脚長節の前縁に於ける棘數が不明であるが, 種々の點より見て本化石標本を新種と認め, 之にScylla miocenica INAGAKI なる新名を與へた。抄録全体を表示PDF形式でダウンロード (371K) -
畑井 小虎, 西山 省三1939 年 46 巻 544 号 p. 37-46
発行日: 1939/01/20
公開日: 2008/04/11
ジャーナル フリー日本産帆立貝類中, 層位學的並に時代的に興味ありと思はれる或種に關する古生物學的記事である。即ち Pecten kimurai YOKOYAMA Pecten tokyoensis TOKUNAGA P., murayamai YOKOYAMA P., s-hataii NOMURA P., kagamianus YOKOYAMA P., cosbensis YOKOYAMA P., swiftii BERNARDI P., notoensis YOKOYAMA P., heterolyptus YOKOYAMA - P., kurosawensis YOKOYAMA P., crassivenius YOKOYAMA の11種及び之等に關係あると考へられる或る種に就て言及し, 尚ほ Pecten kimurai ugoensis HATAI et NISIYAMA なる1新亞種を記した。抄録全体を表示PDF形式でダウンロード (1432K)
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