Journal of the Sedimentological Society of Japan

Mudbanks in Florida Bay

Tomoya Yuki

1998 Volume 47 Issue 47 Pages 1-2
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.1

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A short history of sedimentology

International aspect

Hakuyu Okada

1998 Volume 47 Issue 47 Pages 3-15
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.3

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Sedimentology established in early 1960s has come into the new era as an established discipline of earth sciences. A review of the development of sedimentology has been made on the following respects:
1. In the course of stratigraphy
(1) Establishment of the concept of unconformity, (2) geometry of strata based on the geologic map and stratigraphy, (3) establishment of uniformitarianism and actualism, (4) founding of the facies concept, (5) sedimentary processes and paleoenvironments, (6) basin analysis, (7) seismic stratigraphy, and (8) sequence stratigraphy.
2. Development of sedimentary petrology (Western European School, 1849-1950s)
3. Granulometry and sedimentation (American School, 1920s-1960s)
4. Lithology and facies analysis (Russian School, 1870s-1970s)
5. Establishment of sedimentology
(1) Disqute on the term of “sedimentology” in U. S. A., (2) organization of sedimentology: start of the International Sedimentological Congress (ISC) and establishment of the International Association of Sedimentologists (IAS), (3) organization of educational and research institutes, (4) Trinity in sedimentology: sedimentary petrology, sedimentation and facies analysis, (5) internationalizing and extension of sedimentology, and (6) planetary sedimentology.

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Sedimentation of the Upper Jurassic Koike Limestone, Somanakamura district, northeastern Japan

Osamu Kiyama, Yasufumi Iryu

1998 Volume 47 Issue 47 Pages 17-31
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.17

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The middle Jurassic to lowermost Cretaceous Somanakamura Group crops out in an area along the eastern margin of the Abukuma Mountains, Fukushima Prefecture, northeast Japan. Shallow marine carbonates, 35-meter thick, constitute the upper part of the Nakanosawa Formation, one of the constituent formations of the group. The carbonate sequence named the Koike Limestone is Tithonian in age. Stratigraphical and sedimentological investigations reveal that the carbonate sequence is divisible into five sedimentary units, each of which consists of the grainstone/packstone/wackestone with abundant oncoids and/or peloids and skeletal and non-skeletal grains with micrite coatings, that grades upward into the coral floatstone. The former is thought to have been formed in open, high-energy marine environment while the latter in restricted low-energy one. These data are taken to suggest that relative transgressions intermittently occurred five times during the deposition of the Koike Limestone. The pattern of sea-level changes inferred from the depositional sequence of the middle to upper Somanakamura Group agrees well with the long term eustatic curve derived from coastal onlap.

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Fluvial to bay-estuarine system and depositional sequences of the Eocene Ishikari Group, central Hokkaido

Osamu Takano, Amane Waseda, Hideki Nishita, Tetsuro Ichinoseki, Ken'ic ...

1998 Volume 47 Issue 47 Pages 33-53
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.33

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Sequence stratigraphic analysis was carried out for the Eocene Ishikari Group distributed in the Ishikari Coalfield, forming a part of the Sorachi-Ezo Belt in central Hokkaido, Japan, in order to clarify the characteristics of its fluvial-dominated depositional systems and their response to relative sea-level changes.
Twenty four sedimentary facies and five facies associations are recognized in the Ishikari Group as a result of sedimentary facies analysis. Five facies associations, BF, MF, LA, ES and SH indicate a braided fluvial, meandering fluvial, lacustrine, bay-estuarine and open marine system, respectively. On the basis of fades successions and temporal and spatial distribution of the facies associations, four third-order depositional sequences (Isk-1, Isk-2, Isk-3 and Isk-4) are recognized in the Eocene Ishikari Group. Each third-order depositional sequence contains several fourth-order depositional sequences.
The Eocene Ishikari Group was deposited in a narrow N-S trending basin in response to relative sea-level (base level) changes during Eocene time. When relative sea level rose, transgression occurred and a bay-estuarine system predominated in the basin, whereas, when relative sea level was highstand and fell, a meandering to braided fluvial system predominated.

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Measurement of sedimentation rate at Daihai and Blackspring Lakes in China using radioactive nuclides and their sedimentary environment

Yutaka Kanai, Yoshio Inouchi, Takao Tokuoka

1998 Volume 47 Issue 47 Pages 55-70
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.55

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Radionuclides distribution and chemical components in the two cored sediments in the two Chinese lakes were studied, and the rates of sedimentation were determined. The average sedimentation rate of Lake Daihai (DH-1), the inland lake, was about 0.3cm/y, which is in the range of those reported in some Japanese lakes. It is suggested that the chemical composition varied a little as the source of sediments changed. On the other hand, the average sedimentation rate of Lake Blackspring (KS-2), the closed lake, was calculated to be about 0.1cm/y, which is 1/3 of DH-1. The samples around 16-18cm depth of KS-2 core where water contents and chemical components varied largely, were estimated to have deposited 160-180y ago, and thereafter the different sediment might deposit. The inventories of Cs-137 in the Chinese lakes were larger than those expected from its relationships with excess Pb-210 in the Japanese lakes. This fact indicates the larger amount of Cs-137 fallout in China than in Japan, and a little loss of Cs-137 in the Chinese lakes.

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The bed-step and pool fomation in the Kisu River, Yamizo Mountains

Makoto Sakuda, Tatsuhiro Seki, Yasuhiko Makino

1998 Volume 47 Issue 47 Pages 71-81
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.71

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In the Kisu River in Yamizo Mountains, there are step-pool structures on their river bed. The step is composed of boulders accumulated and the pool is concave with minor amounts of sands and smaller gravels. Bigger boulders derived from sheets of basalt in river banks and river beds could be moved sometimes by floods. Bigger boulders could be often caught by projections and/or fractures in the river bed. As a result, bigger boulders could make a stable accumulation body on the river bed. The whole accumulation body might be stable for high stage water, such as every several tens years. Even though only one boulder of an accumulation body might be derived, other boulders of the body could be easily flowed.

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How to reconstruct changing rates of relative sea-level rise

Tetsuji Muto

1998 Volume 47 Issue 47 Pages 83-93
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.83

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“Freeze” and “freeze deposits”

A preliminary report

Tsunemasa Shiki, Kazuhisa Suzuki

1998 Volume 47 Issue 47 Pages 95-101
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.95

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The new term “freeze” can be defined as sudden stop of a moving system in an infinitedly short time without any change of the internal features such as structure and fabric of the system. The movement may be of some high energy just before the stop instance. “Freeze of chaos” can be one of the most interest, if it is in nature or mathematics. Freeze of sedimentary phenomena can be called as “sedimentary freeeze”.
“Freeze” in the strict sense, i.e. “ideal freeze”, can not be in nature. “Actual freezes”, however, can occur and provide sedimentary records of high energy events such as earthquakes and chaotic flows in geohistory. Ambiguous use of “freezing” may be convenient sometimes.

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Sedimentary experiments with a PET bottle

Yuichiro Miyata

1998 Volume 47 Issue 47 Pages 103-105
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.103

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Convenient program for drawing geologic columns

Yuichiro Miyata, Makoto Kimura

1998 Volume 47 Issue 47 Pages 107-111
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.107

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A commentary on “Astrochronology”

Makoto Okada

1998 Volume 47 Issue 47 Pages 113-118
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.113

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Report from 6th International Conference on Fluvial Sedimentology in Cape Town, South Africa

Katsuhiro Nakayama, Takayuki Kawabe

1998 Volume 47 Issue 47 Pages 133-138
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.133

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Report on the organization and annual meetings of the “Stanford Project on Deep-sea Depositional Systems”

Osamu Takano

1998 Volume 47 Issue 47 Pages 139-150
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.139

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Report on the CSPG-SEPM 1997 JOINT CONVENTION

Akiko Omura

1998 Volume 47 Issue 47 Pages 151-157
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.151

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Report from 1997 Sedimentological Society of Japan Field Trip

Yukihiro Kato

1998 Volume 47 Issue 47 Pages 159-162
Published: April 30, 1998
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.47.159

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