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Volume 60, Issue 702
Displaying 1-4 of 4 articles from this issue
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Keiji NAKAZAWA, Tsunemasa SHIKI, Daikichiro SHIMIZU1954 Volume 60 Issue 702 Pages 97-105
Published: March 25, 1954
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESSThe Upper Permian Kose group, the Lower and Middle Triassic Fukumoto group, the Upper Triassic Yanagi formation and Nakaiso conglomerate beds, the so-called Inkstone group, and basic intrusive rocks crop out in the vicinity of Fukumoto-mura in Okayama Prefecture., The Palaeozoic and Mesozoic formations in this district, together with the basic rocks, indicate that the "Maizuru Zone" extends into Okayama Prefecture about 130km., WSW of Maizuru in Kyoto Prefecture., The stratigraphy of the Palaeozoic and Triassic formations is shown in the following table., Norian?-Nakaiso conglomerate beds., ., ., ., ., ., mainly conglomerate with sandstone, thickness 200m., unconformity? Carnian-Yanagi formation., ., ., ., ., ., black shale and carbonaceous sandy shale, thickness 70m., fault Anisian-Miyano-oku formation., ., ., ., ., ., dark blue calcareous sandy shale with shale and fine sandstone, thickness 300m., Kyogakubo formation., ., ., ., ., ., alternation of shale and sandstone, thickness 270-300m., Scythian -Kusano formation., ., ., ., ., ., mainly fine to medium sandstone with conglomerate, thickness 68-96m+., fault Upper Permian-Kose group., ., ., ., ., ., mainly black shale with sandstone and conglomerate lens, thickness 350m -., The Kose group contains fusulinids such as Lepidolina, sp., and Yabeina, sp., and is correlated with the Upper Permian Kuma series in Kyushu., The Fukumoto group contains pelecypod-fossils such as Neobakevellia kanb i NAKAZAWA (MS., ), Myophoria, aff., laevigata, ALBERTI, Eumorphotis sp., nov, and "Pecten" sichoticus BITTNER, in the Kusano and Kyogakubo formations, and cephalopods such as Hollandites sp., "Danubites" sp., and Orthoceras sp., in the Miyano-oku formation., From these fossils the group is considered Scythian and Anisian in age., The group is in fault contact with the Kose group, but is supposed to overlie the Kose group unconformably., The Norian (?) Nakaiso conglomerate beds overlie the Kose and Fukumoto groups in angular unconformity as a result of a severe crustal movement of Ladinian or Carnian age.,View full abstractDownload PDF (1315K) -
Sadakatu TANEDA, Yukio MATUMOTO1954 Volume 60 Issue 702 Pages 106-112
Published: March 25, 1954
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESSVolcano Aso which had been almost dormant since April, 1952, suddenly became active at the end of April, 1953., Repeated explosions occurred in Nakadake crater, the first of which occurred at 11h31m, April 27, the second at 02h16m, April 28, the third at 22h56m, April 29, and the fourth at 10h35m hours, May 4., Two or three additional explosions occurred in June, July and September., Each explosion occurred with sone forerunning slight earthquakes, after a repose period (3-17 hours) of the seismometer., The pre-eruption repose period was especially marked for the first, second, and third eruptions., The new ejecta are dark, somewhat glassy, pyroxene-andesites, the origin of which may be accessory or essential., The largest one is about five tons in weight., The blocks of tuff constructing the wall of the crater were also ejected., Some of them contain strongly deliquescent material, the chemical composition of which is shown in Table 1., Ash was thrown up in the air and scattered mostly northward, sometimes falling on and around the villages of Miyaji and Bochu in the northern part of the so-called "Aso Caldera".,View full abstractDownload PDF (1326K) -
Tamio KOTAKA, Shozo HAYASAKA1954 Volume 60 Issue 702 Pages 113-117
Published: March 25, 1954
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESSl., Some observations and experiments were made on the transportation of sand by floatation in Matsukawa Bay, Fukushima Prefecture., 2., The amount of sand transported by floatation by a gentle rising tide was calculated to be 117-154 kilograms per hour, and the distance of transportation was estimated to be 250 meters along the shore line of a sand bar., 3., The median diameter of the floating sand was somewhat greater than that of the beach sand in both natural and artificial floatation., 4., Of the sand grains exceeding 1/4 millimeter in size, the sphericity and roundness of the floating sand was somewhat less (more angular) than that of the beach sand., In the case of sand grains less than 1/4 millimeter in size no difference was noted in their degree of roundness., 5., The sorting coefficient and skewness which indicate slight anomalies showed no general tendency., 6., It may be of some geological interest that transportation of sand by floating takes place only when the water is so calm that other agencies such as traction, saltation and suspension fail to occur., It is also of interest that selective sorting by floatation may result in the deposition of particular sediments after transportation.,View full abstractDownload PDF (1461K) -
Hideo KOBAYASHI1954 Volume 60 Issue 702 Pages 118-128
Published: March 25, 1954
Released on J-STAGE: April 11, 2008
JOURNAL FREE ACCESSDownload PDF (1307K)
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