Earth Science (Chikyu Kagaku)

Tubular form phyllosilicate newly found in a meteorite

Junji AKAI

Article type: Article
1980 Volume 34 Issue 3 Pages ii-iib
Published: May 25, 1980
Released on J-STAGE: July 26, 2017

DOIhttps://doi.org/10.15080/agcjchikyukagaku.34.3_ii

JOURNAL OPEN ACCESS

Download PDF (2308K)
Geology of Sasagami Hills, to the east of Niigata Plain, Japan

Collaborative Research Group for the Sasagami Hills

Article type: Article
1980 Volume 34 Issue 3 Pages 119-137
Published: May 25, 1980
Released on J-STAGE: July 26, 2017

DOIhttps://doi.org/10.15080/agcjchikyukagaku.34.3_119

JOURNAL OPEN ACCESS

Show abstractHide abstract

The Sasagami hills located to the east of the Niigata plain are one of the most suitable area for the study of the Shibata-Koide tectonic line (Yamashita, 1970). The movement of this tectonic line since Miocene is closely related to the tectonic development of the Niigata Cenozoic sedimentary basin. In addition in this area, it was said that the Pleistocene strata correlative to the "Yashiroda Formation", which gives rise to some problems in relation to the standard stratigraphy of Niigata prefecture, are widely distributed. In this paper, the present writer intends to describe the detailed stratigraphy of the Miocene to the Pleistocene strata especially of the "Yashiroda Formation", and to restore the movement of the Shibata-Koide tectonic line. Results of the research are summarized as follows: 1. On the east side of the Shibata-Koide tectonic line, the Miocene series are divided into the Arakawa Formation and the Yamanokami Formation, which unconformably overlies the granitic basement of the Gozu mountains. 2. On the west side of the tectonic line, the continuous deposits from the Miocene to the Pleistocene are distributed on the Sasagami hills. They are classified into the Sakanaiwa, the Haguro, the Dainich, the Sasagami Formations, the Zingamine conglomerate member and terrace deposits. 3. Based on the lithologic facies and the fossils yielded, the Sasagami Formation can be correlated to the Uonuma Group and not to the "Yashiroda Formation". 4. Well developed terraces on the west and the south of the Sasagami hills are divided into the following three groups from their relative height: T1 group (20〜30m in relative height), T2 group (1〜15m) and T3 group (0〜2m). 5. The Shibata-Koide tectonic line in this area may be represented by a step-fault system with westerly throwndown sense. The total throw is estimated more than 4000 m. 6. The notable appearance of the Shibata-Koide tectonic line might be in the late Miocne to the Pliocene, and the particular topography in the Gozu-Sasagami area would be formed since the middle Pleistocene.

View full abstract

Download PDF (2203K)
New occurrence of Lower Carboniferous in Shikoku with description of a new aulate rugosa

Hitoshi NAKAI

Article type: Article
1980 Volume 34 Issue 3 Pages 138-143
Published: May 25, 1980
Released on J-STAGE: July 26, 2017

DOIhttps://doi.org/10.15080/agcjchikyukagaku.34.3_138

JOURNAL OPEN ACCESS

Show abstractHide abstract

Lower Carboniferous rugose corals are first found from the eastern foot of Mt. Yokokura, Kochi Prefecture , Japan. The fossil bearing strata are named Buntoku Formation. Then, a newly found aulate rugose coral, Aulostrotion yokokuraense gen. et sp. nov., is described and discussion is made on "autos" structure in general.

View full abstract

Download PDF (1621K)
New materials of Stegodon orientalis OWEN from Kuzuu-machi, Tochigi Prefecture

Shigeo MIYAZAKI, Hiroyuki MISHIMA

Article type: Article
1980 Volume 34 Issue 3 Pages 144-155
Published: May 25, 1980
Released on J-STAGE: July 26, 2017

DOIhttps://doi.org/10.15080/agcjchikyukagaku.34.3_144

JOURNAL OPEN ACCESS

Show abstractHide abstract

Recently new materials of Stegodon orientalis OWEN were discovered from Murakashi Quarry, Kuzuu-machi, Aso district, Tochigi Prefecture. Those materials consist of fossil bones and molars obtained from the fissure-filling deposits, and are considered to belong to one young individual. The molars are composed of ₂DP, DP₄, M₁. The measurements of those molars indicate that, for example in the case of M₁, there are some characteristics of narrow crown breadth, high lamellar frequency and thin enamel. It is remarkable that these characteristics are common to other two specimens from Kuzuu area which were formerly described by TOKUNAGA and TAKAI (1938) and SHIKAMA (1949). Nevertheless, in comparison with other specimens of Japan and China, there seems to be some differences with each other in some degrees. It may suggest that the differences are due to geographical or chronological variation. According to the analysis of pumice grains included in the yielded sediments, the horizon of the present materials is correlative with the Lower Kuzuu formation and is contemporaneous with the Tama Loam stage of the Middle Pleistocene.

View full abstract

Download PDF (2488K)
Active Fault in the eastern part of the Niigata plain, Central Japan

Nobuyuki TAKAHAMA, Emiko FUKUZAWA, Yuko OKADA

Article type: Article
1980 Volume 34 Issue 3 Pages 156-158a
Published: May 25, 1980
Released on J-STAGE: July 26, 2017

DOIhttps://doi.org/10.15080/agcjchikyukagaku.34.3_156

JOURNAL OPEN ACCESS

Download PDF (1233K)
The evolution of the mantle and crust of the moon

Kenji SHUTO

Article type: Article
1980 Volume 34 Issue 3 Pages 159-176
Published: May 25, 1980
Released on J-STAGE: July 26, 2017

DOIhttps://doi.org/10.15080/agcjchikyukagaku.34.3_159

JOURNAL OPEN ACCESS

Download PDF (1929K)
Земная кора под океаном. Природа, Н. 4, 42-47(1979)

Г.Б. Рудник, Г.Л. Кашинцев, H. AOKI, K. UTSUGI, M. ARAKAWA

Article type: Article
1980 Volume 34 Issue 3 Pages 177-179
Published: May 25, 1980
Released on J-STAGE: July 26, 2017

DOIhttps://doi.org/10.15080/agcjchikyukagaku.34.3_177

JOURNAL OPEN ACCESS

Download PDF (387K)

Register with J-STAGE for free!