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Volume 48, Issue 575
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Manabu KOBAYASI1941 Volume 48 Issue 575 Pages 369-383
Published: August 20, 1941
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESSThe Tertiary strata of this district can be subdivided into Nakayama bed, Sirakata bed, Iwane bed, Katahira bed, and Hukura bed., The Nakayama bed consists of basal conglomerate, sandstone, green tuff, sandstone agglomerate, sandstone, and is older than at least the Middle Miocene., Over this lies conformably the Sirakata bed, which consists of green tuff and an alternation of conglomerate, sandstone, shale and tuff ; many remains of molluscs occur in this bed., The following marine fossils were found in the lower part of this bed ; Arca ninohensis OTUKA Pecten kaneharai YOKOYAMA Pecten kagamianus YOKOYAMA Lucina acutilineata CONRAD Cardium Shiobarense YOKOYAMA Venus yokoyamai MAKIYAMA Macoma optiva YOKOYAMA Cultellus izumoensis YOKOYAMA Panomya simotomensis OTUKA The following fossils occur in the upper part ; Lucina acutilineata CONRAD Dentalium yokoyamai MAKIYAMA Linthia nipponica YOSHIWARA This bed may be correlated with the Siobara, Tanagura, Yanagawa, Siogama shell beds, and the age is Middle Miocene., Over this lies with slight unconformity the Iwane bed, which consists of liparite and its agglomerate ; and over this, with marked unconformity lies the Katahira bed, consisting of conglomerate and tuff ; and the unconformably overlying Hukura bed consists of dacite and its tiff., This district suffered two crustal movements., The formation of the first movement may have dated from the late Iwate bed and early Hukura bed, that is, from late upper Miocene and probably early Pliocene., Nakayama and Sirakata beds are folded, faulted and dip with high angle., The formation of the second movement may have date later than the Hukura bed, that is, probably later than Pliocene ; this was mainly a fault in NS trend, and resulted in the construction of graben and horst.,View full abstractDownload PDF (1718K) -
Nobuo KURATA, Kiyohiko AOZi, Tuneo HUKASAWA1941 Volume 48 Issue 575 Pages 384-390
Published: August 20, 1941
Released on J-STAGE: April 11, 2008
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Hideo INUZUKA1941 Volume 48 Issue 575 Pages 391-393
Published: August 20, 1941
Released on J-STAGE: April 11, 2008
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Jiro MAKIYAMA1941 Volume 48 Issue 575 Pages 394-402
Published: August 20, 1941
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESSThe thick neogenic sedimentary strata of Japan are intensely folded and fractured., While the majority of the rocks are non-consoildated they have plastic properties depending upon the cohesion established by capillary fores of water and the presence of colloidal substance., This conditon is termed subconsolidate., Compaction is helpfull in making a more enforced subconsolidation., Numbers of shearing planes and other fracture planes were measured in Etigo and these are represented by streographic projection., Generally speaking there are these forms of relation between a bedding plane and main shearing planes., In the first form the bedding plane is parallel or vertical to the axis of maximum strain, while in the second it is nearly vertical to the neutral axis., The third form is the case that the shearing plane is parallel to the bedding plane., There are but few exceptions., Some other discussions on this subjects are added.,View full abstractDownload PDF (1276K) -
Teiichi KOBAYASHI1941 Volume 48 Issue 575 Pages 403-409
Published: August 20, 1941
Released on J-STAGE: April 11, 2008
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Koiti SUZUKI1941 Volume 48 Issue 575 Pages 410-413
Published: August 20, 1941
Released on J-STAGE: April 11, 2008
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Motoki EGUCHI1941 Volume 48 Issue 575 Pages 414-417
Published: August 20, 1941
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESSThe simple corals were collected by Mr., W., HASHIMOTO from the Sumagui formation developed on Mindoro Island in the Pbilippines., His collection proved to contain the following species: Falbellum transversale MOSELEY, Acanthocyathus grayi MILNE-EDWARDS et HAIME, Citharocyathus conicus ALCOCK, Heterocyathus aequicostatus MILNE-EDWARDS et HAIME, Anthemiphyllia dentatus (ALCOCK), Acanthophyllia cf., deshayesiana MICHELIN, Trochocyathus(Thecocyathus) hanzawai YABE et EGUCHI, Heteropsammia michelinii MILNE-EDWARDS et HAIME, Balanophyllia gigas (BRUGGEMAN) HORST, Goniastrea aff., retiformis LAMARCK, Fungia sp., (broken fragment), and Fungia sp., (Cycloseris form), F., aff., patelliformis BOSCHMA., The last mentioned three are reef-building corals, and the others are all deep-sea corals., All except Trochocyathus(Thecocyathus) hanzawai YABE et EGUCHI are now living in the adjacent waters of the Philippine Islands, and all except Acanthocyathus grayi MILNE-EDWARDS et HAIME, Acanthophyllia cf., deshayesiana MICHELIN and Heteropsammia michelinii MILNE-EDWARDS et HAIME are represented in the Ryukyu limestone formation of Kikai-zima, Ryukyu Islands., Acanthocyathus grayi, according to UMBGROVE is a synonym Acanthocyathus malayicus GERTH, however, from a study of numerous specimens from the Pliocene deposits at Tonohama, Tosa Province, it is certain that the former is not a synonym of the latter., Details will be published at a later date.,View full abstractDownload PDF (538K) -
Motoki EGUCHI1941 Volume 48 Issue 575 Pages 418-420
Published: August 20, 1941
Released on J-STAGE: April 11, 2008
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